feat(chromium): skip or waits for networkIdle2 event

.bruno/Chromium/Convert/HTML to PDF.bru

@@ -1,72 +0,0 @@
-meta {
-  name: HTML to PDF
-  type: http
-  seq: 2
-}
-
-post {
-  url: {{baseUrl}}/forms/chromium/convert/html
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page-1-html/index.html)
-  ~landscape: false
-  ~printBackground: false
-  ~scale: 1.0
-  ~singlePage: false
-  ~paperWidth: 8.5
-  ~paperHeight: 11
-  ~marginTop: 0.39
-  ~marginBottom: 0.39
-  ~marginLeft: 0.39
-  ~marginRight: 0.39
-  ~nativePageRanges: 1-2
-  ~preferCssPageSize: false
-  ~generateDocumentOutline: false
-  ~generateTaggedPdf: false
-  ~skipNetworkIdleEvent: false
-  ~failOnHttpStatusCodes: [499,599]
-  ~failOnResourceHttpStatusCodes: []
-  ~ignoreResourceHttpStatusDomains: []
-  ~failOnResourceLoadingFailed: false
-  ~failOnConsoleExceptions: false
-  ~waitDelay: 0s
-  ~waitWindowStatus:
-  ~waitForExpression:
-  ~waitForSelector:
-  ~cookies: [{"name":"my_cookie","value":"my_value","domain":"example.com"}]
-  ~userAgent:
-  ~extraHttpHeaders: {"X-Custom-Header":"value"}
-  ~emulatedMediaType: print
-  ~emulatedMediaFeatures: {"prefers-color-scheme":"dark"}
-  ~omitBackground: false
-  ~splitMode: intervals
-  ~splitSpan: 1
-  ~splitUnify: false
-  ~pdfa: PDF/A-1b
-  ~pdfua: true
-  ~metadata: {"Author":"Bruno","Title":"Test"}
-  ~userPassword:
-  ~ownerPassword:
-  ~watermarkSource: text
-  ~watermarkExpression: CONFIDENTIAL
-  ~watermarkPages:
-  ~watermarkOptions: {"scale":"0.5 abs","rot":"45","fillcolor":"#FF0000"}
-  ~stampSource: text
-  ~stampExpression: DRAFT
-  ~stampPages:
-  ~stampOptions: {"scale":"0.5 abs","rot":"45"}
-  ~rotateAngle: 90
-  ~rotatePages:
-}
-
-headers {
-  ~Gotenberg-Output-Filename: my-file
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/Chromium/Convert/Markdown to PDF.bru

@@ -1,73 +0,0 @@
-meta {
-  name: Markdown to PDF
-  type: http
-  seq: 3
-}
-
-post {
-  url: {{baseUrl}}/forms/chromium/convert/markdown
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page-1-markdown/index.html)
-  files: @file(../../test/integration/testdata/page-1-markdown/page_1.md)
-  ~landscape: false
-  ~printBackground: false
-  ~scale: 1.0
-  ~singlePage: false
-  ~paperWidth: 8.5
-  ~paperHeight: 11
-  ~marginTop: 0.39
-  ~marginBottom: 0.39
-  ~marginLeft: 0.39
-  ~marginRight: 0.39
-  ~nativePageRanges: 1-2
-  ~preferCssPageSize: false
-  ~generateDocumentOutline: false
-  ~generateTaggedPdf: false
-  ~skipNetworkIdleEvent: false
-  ~failOnHttpStatusCodes: [499,599]
-  ~failOnResourceHttpStatusCodes: []
-  ~ignoreResourceHttpStatusDomains: []
-  ~failOnResourceLoadingFailed: false
-  ~failOnConsoleExceptions: false
-  ~waitDelay: 0s
-  ~waitWindowStatus:
-  ~waitForExpression:
-  ~waitForSelector:
-  ~cookies: [{"name":"my_cookie","value":"my_value","domain":"example.com"}]
-  ~userAgent:
-  ~extraHttpHeaders: {"X-Custom-Header":"value"}
-  ~emulatedMediaType: print
-  ~emulatedMediaFeatures: {"prefers-color-scheme":"dark"}
-  ~omitBackground: false
-  ~splitMode: intervals
-  ~splitSpan: 1
-  ~splitUnify: false
-  ~pdfa: PDF/A-1b
-  ~pdfua: true
-  ~metadata: {"Author":"Bruno","Title":"Test"}
-  ~userPassword:
-  ~ownerPassword:
-  ~watermarkSource: text
-  ~watermarkExpression: CONFIDENTIAL
-  ~watermarkPages:
-  ~watermarkOptions: {"scale":"0.5 abs","rot":"45","fillcolor":"#FF0000"}
-  ~stampSource: text
-  ~stampExpression: DRAFT
-  ~stampPages:
-  ~stampOptions: {"scale":"0.5 abs","rot":"45"}
-  ~rotateAngle: 90
-  ~rotatePages:
-}
-
-headers {
-  ~Gotenberg-Output-Filename: my-file
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/Chromium/Convert/URL to PDF.bru

@@ -1,72 +0,0 @@
-meta {
-  name: URL to PDF
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/chromium/convert/url
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  url: https://example.com
-  ~landscape: false
-  ~printBackground: false
-  ~scale: 1.0
-  ~singlePage: false
-  ~paperWidth: 8.5
-  ~paperHeight: 11
-  ~marginTop: 0.39
-  ~marginBottom: 0.39
-  ~marginLeft: 0.39
-  ~marginRight: 0.39
-  ~nativePageRanges: 1-2
-  ~preferCssPageSize: false
-  ~generateDocumentOutline: false
-  ~generateTaggedPdf: false
-  ~skipNetworkIdleEvent: false
-  ~failOnHttpStatusCodes: [499,599]
-  ~failOnResourceHttpStatusCodes: []
-  ~ignoreResourceHttpStatusDomains: []
-  ~failOnResourceLoadingFailed: false
-  ~failOnConsoleExceptions: false
-  ~waitDelay: 0s
-  ~waitWindowStatus:
-  ~waitForExpression:
-  ~waitForSelector:
-  ~cookies: [{"name":"my_cookie","value":"my_value","domain":"example.com"}]
-  ~userAgent:
-  ~extraHttpHeaders: {"X-Custom-Header":"value"}
-  ~emulatedMediaType: print
-  ~emulatedMediaFeatures: {"prefers-color-scheme":"dark"}
-  ~omitBackground: false
-  ~splitMode: intervals
-  ~splitSpan: 1
-  ~splitUnify: false
-  ~pdfa: PDF/A-1b
-  ~pdfua: true
-  ~metadata: {"Author":"Bruno","Title":"Test"}
-  ~userPassword:
-  ~ownerPassword:
-  ~watermarkSource: text
-  ~watermarkExpression: CONFIDENTIAL
-  ~watermarkPages:
-  ~watermarkOptions: {"scale":"0.5 abs","rot":"45","fillcolor":"#FF0000"}
-  ~stampSource: text
-  ~stampExpression: DRAFT
-  ~stampPages:
-  ~stampOptions: {"scale":"0.5 abs","rot":"45"}
-  ~rotateAngle: 90
-  ~rotatePages:
-}
-
-headers {
-  ~Gotenberg-Output-Filename: my-file
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/Chromium/Screenshot/HTML Screenshot.bru

@@ -1,46 +0,0 @@
-meta {
-  name: HTML Screenshot
-  type: http
-  seq: 2
-}
-
-post {
-  url: {{baseUrl}}/forms/chromium/screenshot/html
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page-1-html/index.html)
-  ~width: 800
-  ~height: 600
-  ~clip: false
-  ~format: png
-  ~quality: 100
-  ~optimizeForSpeed: false
-  ~skipNetworkIdleEvent: false
-  ~failOnHttpStatusCodes: [499,599]
-  ~failOnResourceHttpStatusCodes: []
-  ~ignoreResourceHttpStatusDomains: []
-  ~failOnResourceLoadingFailed: false
-  ~failOnConsoleExceptions: false
-  ~waitDelay: 0s
-  ~waitWindowStatus:
-  ~waitForExpression:
-  ~waitForSelector:
-  ~cookies: [{"name":"my_cookie","value":"my_value","domain":"example.com"}]
-  ~userAgent:
-  ~extraHttpHeaders: {"X-Custom-Header":"value"}
-  ~emulatedMediaType: screen
-  ~emulatedMediaFeatures: {"prefers-color-scheme":"dark"}
-  ~omitBackground: false
-}
-
-headers {
-  ~Gotenberg-Output-Filename: my-screenshot
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/Chromium/Screenshot/Markdown Screenshot.bru

@@ -1,47 +0,0 @@
-meta {
-  name: Markdown Screenshot
-  type: http
-  seq: 3
-}
-
-post {
-  url: {{baseUrl}}/forms/chromium/screenshot/markdown
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page-1-markdown/index.html)
-  files: @file(../../test/integration/testdata/page-1-markdown/page_1.md)
-  ~width: 800
-  ~height: 600
-  ~clip: false
-  ~format: png
-  ~quality: 100
-  ~optimizeForSpeed: false
-  ~skipNetworkIdleEvent: false
-  ~failOnHttpStatusCodes: [499,599]
-  ~failOnResourceHttpStatusCodes: []
-  ~ignoreResourceHttpStatusDomains: []
-  ~failOnResourceLoadingFailed: false
-  ~failOnConsoleExceptions: false
-  ~waitDelay: 0s
-  ~waitWindowStatus:
-  ~waitForExpression:
-  ~waitForSelector:
-  ~cookies: [{"name":"my_cookie","value":"my_value","domain":"example.com"}]
-  ~userAgent:
-  ~extraHttpHeaders: {"X-Custom-Header":"value"}
-  ~emulatedMediaType: screen
-  ~emulatedMediaFeatures: {"prefers-color-scheme":"dark"}
-  ~omitBackground: false
-}
-
-headers {
-  ~Gotenberg-Output-Filename: my-screenshot
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/Chromium/Screenshot/URL Screenshot.bru

@@ -1,46 +0,0 @@
-meta {
-  name: URL Screenshot
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/chromium/screenshot/url
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  url: https://example.com
-  ~width: 800
-  ~height: 600
-  ~clip: false
-  ~format: png
-  ~quality: 100
-  ~optimizeForSpeed: false
-  ~skipNetworkIdleEvent: false
-  ~failOnHttpStatusCodes: [499,599]
-  ~failOnResourceHttpStatusCodes: []
-  ~ignoreResourceHttpStatusDomains: []
-  ~failOnResourceLoadingFailed: false
-  ~failOnConsoleExceptions: false
-  ~waitDelay: 0s
-  ~waitWindowStatus:
-  ~waitForExpression:
-  ~waitForSelector:
-  ~cookies: [{"name":"my_cookie","value":"my_value","domain":"example.com"}]
-  ~userAgent:
-  ~extraHttpHeaders: {"X-Custom-Header":"value"}
-  ~emulatedMediaType: screen
-  ~emulatedMediaFeatures: {"prefers-color-scheme":"dark"}
-  ~omitBackground: false
-}
-
-headers {
-  ~Gotenberg-Output-Filename: my-screenshot
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/Health & Info/Debug.bru

@@ -1,11 +0,0 @@
-meta {
-  name: Debug
-  type: http
-  seq: 3
-}
-
-get {
-  url: {{baseUrl}}/debug
-  body: none
-  auth: none
-}

.bruno/Health & Info/Health.bru

@@ -1,11 +0,0 @@
-meta {
-  name: Health
-  type: http
-  seq: 1
-}
-
-get {
-  url: {{baseUrl}}/health
-  body: none
-  auth: none
-}

.bruno/Health & Info/Prometheus Metrics.bru

@@ -1,11 +0,0 @@
-meta {
-  name: Prometheus Metrics
-  type: http
-  seq: 4
-}
-
-get {
-  url: {{baseUrl}}/prometheus/metrics
-  body: none
-  auth: none
-}

.bruno/Health & Info/Version.bru

@@ -1,11 +0,0 @@
-meta {
-  name: Version
-  type: http
-  seq: 2
-}
-
-get {
-  url: {{baseUrl}}/version
-  body: none
-  auth: none
-}

.bruno/LibreOffice/Convert to PDF.bru

@@ -1,74 +0,0 @@
-meta {
-  name: Convert to PDF
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/libreoffice/convert
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.docx)
-  ~password:
-  ~landscape: false
-  ~nativePageRanges:
-  ~updateIndexes: false
-  ~exportFormFields: true
-  ~allowDuplicateFieldNames: false
-  ~exportBookmarks: true
-  ~exportBookmarksToPdfDestination: false
-  ~exportPlaceholders: false
-  ~exportNotes: false
-  ~exportNotesPages: false
-  ~exportOnlyNotesPages: false
-  ~exportNotesInMargin: false
-  ~convertOooTargetToPdfTarget: false
-  ~exportLinksRelativeFsys: false
-  ~exportHiddenSlides: false
-  ~skipEmptyPages: false
-  ~addOriginalDocumentAsStream: false
-  ~singlePageSheets: false
-  ~losslessImageCompression: false
-  ~quality: 90
-  ~reduceImageResolution: false
-  ~maxImageResolution: 300
-  ~nativeWatermarkText:
-  ~nativeWatermarkColor: 0
-  ~nativeWatermarkFontHeight: 0
-  ~nativeWatermarkRotateAngle: 0
-  ~nativeWatermarkFontName:
-  ~nativeTiledWatermarkText:
-  ~nativePdfFormats: true
-  ~merge: false
-  ~flatten: false
-  ~splitMode: intervals
-  ~splitSpan: 1
-  ~splitUnify: false
-  ~pdfa: PDF/A-1b
-  ~pdfua: true
-  ~metadata: {"Author":"Bruno","Title":"Test"}
-  ~userPassword:
-  ~ownerPassword:
-  ~watermarkSource: text
-  ~watermarkExpression: CONFIDENTIAL
-  ~watermarkPages:
-  ~watermarkOptions: {"scale":"0.5 abs","rot":"45","fillcolor":"#FF0000"}
-  ~stampSource: text
-  ~stampExpression: DRAFT
-  ~stampPages:
-  ~stampOptions: {"scale":"0.5 abs","rot":"45"}
-  ~rotateAngle: 90
-  ~rotatePages:
-}
-
-headers {
-  ~Gotenberg-Output-Filename: my-file
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Bookmarks/Read Bookmarks.bru

@@ -1,23 +0,0 @@
-meta {
-  name: Read Bookmarks
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/bookmarks/read
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-}
-
-headers {
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Bookmarks/Write Bookmarks.bru

@@ -1,25 +0,0 @@
-meta {
-  name: Write Bookmarks
-  type: http
-  seq: 2
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/bookmarks/write
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-  bookmarks: [{"title":"Chapter 1","page":1,"children":[{"title":"Section 1.1","page":1}]}]
-}
-
-headers {
-  ~Gotenberg-Output-Filename: with-bookmarks
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Convert/Convert PDF.bru

@@ -1,26 +0,0 @@
-meta {
-  name: Convert PDF
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/convert
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-  pdfa: PDF/A-1b
-  ~pdfua: true
-}
-
-headers {
-  ~Gotenberg-Output-Filename: converted
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Embed/Embed Files.bru

@@ -1,26 +0,0 @@
-meta {
-  name: Embed Files
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/embed
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-  embeds: @file(../../test/integration/testdata/page_1.pdf)
-  ~downloadFrom: [{"url":"https://example.com/attachment.xml","embedded":true}]
-}
-
-headers {
-  ~Gotenberg-Output-Filename: with-embeds
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Encrypt/Encrypt PDF.bru

@@ -1,26 +0,0 @@
-meta {
-  name: Encrypt PDF
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/encrypt
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-  userPassword: secret123
-  ~ownerPassword: owner456
-}
-
-headers {
-  ~Gotenberg-Output-Filename: encrypted
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Flatten/Flatten PDF.bru

@@ -1,24 +0,0 @@
-meta {
-  name: Flatten PDF
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/flatten
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-}
-
-headers {
-  ~Gotenberg-Output-Filename: flattened
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Merge/Merge PDFs.bru

@@ -1,43 +0,0 @@
-meta {
-  name: Merge PDFs
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/merge
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-  files: @file(../../test/integration/testdata/page_2.pdf)
-  ~flatten: false
-  ~autoIndexBookmarks: false
-  ~pdfa: PDF/A-1b
-  ~pdfua: true
-  ~metadata: {"Author":"Bruno","Title":"Test"}
-  ~bookmarks: [{"title":"Page 1","page":1},{"title":"Page 2","page":2}]
-  ~userPassword:
-  ~ownerPassword:
-  ~watermarkSource: text
-  ~watermarkExpression: CONFIDENTIAL
-  ~watermarkPages:
-  ~watermarkOptions: {"scale":"0.5 abs","rot":"45","fillcolor":"#FF0000"}
-  ~stampSource: text
-  ~stampExpression: DRAFT
-  ~stampPages:
-  ~stampOptions: {"scale":"0.5 abs","rot":"45"}
-  ~rotateAngle: 90
-  ~rotatePages:
-}
-
-headers {
-  ~Gotenberg-Output-Filename: merged
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Metadata/Read Metadata.bru

@@ -1,23 +0,0 @@
-meta {
-  name: Read Metadata
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/metadata/read
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-}
-
-headers {
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Metadata/Write Metadata.bru

@@ -1,25 +0,0 @@
-meta {
-  name: Write Metadata
-  type: http
-  seq: 2
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/metadata/write
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-  metadata: {"Author":"Bruno","Copyright":"Bruno","Creator":"Gotenberg","Keywords":["test"],"Marked":true,"Producer":"Gotenberg","Subject":"Test","Title":"Test Document","Trapped":"Unknown"}
-}
-
-headers {
-  ~Gotenberg-Output-Filename: with-metadata
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Rotate/Rotate PDF.bru

@@ -1,26 +0,0 @@
-meta {
-  name: Rotate PDF
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/rotate
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-  rotateAngle: 90
-  ~rotatePages: 1-2
-}
-
-headers {
-  ~Gotenberg-Output-Filename: rotated
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Split/Split PDF.bru

@@ -1,43 +0,0 @@
-meta {
-  name: Split PDF
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/split
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/pages_3.pdf)
-  splitMode: intervals
-  splitSpan: 1
-  ~splitUnify: false
-  ~flatten: false
-  ~pdfa: PDF/A-1b
-  ~pdfua: true
-  ~metadata: {"Author":"Bruno","Title":"Test"}
-  ~userPassword:
-  ~ownerPassword:
-  ~watermarkSource: text
-  ~watermarkExpression: CONFIDENTIAL
-  ~watermarkPages:
-  ~watermarkOptions: {"scale":"0.5 abs","rot":"45","fillcolor":"#FF0000"}
-  ~stampSource: text
-  ~stampExpression: DRAFT
-  ~stampPages:
-  ~stampOptions: {"scale":"0.5 abs","rot":"45"}
-  ~rotateAngle: 90
-  ~rotatePages:
-}
-
-headers {
-  ~Gotenberg-Output-Filename: split
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Stamp/Stamp PDF.bru

@@ -1,30 +0,0 @@
-meta {
-  name: Stamp PDF
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/stamp
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-  stampSource: text
-  stampExpression: APPROVED
-  ~stampPages: 1-2
-  ~stampOptions: {"font":"Helvetica","fontSize":"48","color":"#00FF00","opacity":"0.5","rotation":"0"}
-  ~stamp: @file(../../test/integration/testdata/watermark.png)
-  ~downloadFrom: [{"url":"https://example.com/stamp.png","field":"stamp"}]
-}
-
-headers {
-  ~Gotenberg-Output-Filename: stamped
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/PDF Engines/Watermark/Watermark PDF.bru

@@ -1,30 +0,0 @@
-meta {
-  name: Watermark PDF
-  type: http
-  seq: 1
-}
-
-post {
-  url: {{baseUrl}}/forms/pdfengines/watermark
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/page_1.pdf)
-  watermarkSource: text
-  watermarkExpression: CONFIDENTIAL
-  ~watermarkPages: 1-2
-  ~watermarkOptions: {"font":"Helvetica","fontSize":"48","color":"#FF0000","opacity":"0.3","rotation":"45"}
-  ~watermark: @file(../../test/integration/testdata/watermark.png)
-  ~downloadFrom: [{"url":"https://example.com/watermark.png","field":"watermark"}]
-}
-
-headers {
-  ~Gotenberg-Output-Filename: watermarked
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}

.bruno/bruno.json

@@ -1,6 +0,0 @@
-{
-  "version": "1",
-  "name": "Gotenberg",
-  "type": "collection",
-  "ignore": ["node_modules", ".git"]
-}

.bruno/collection.bru

@@ -1,3 +0,0 @@
-headers {
-  Gotenberg-Trace: {{traceId}}
-}

.bruno/environments/Demo.bru

@@ -1,4 +0,0 @@
-vars {
-  baseUrl: https://demo.gotenberg.dev
-  traceId: bruno-demo
-}

.bruno/environments/Local.bru

@@ -1,4 +0,0 @@
-vars {
-  baseUrl: http://localhost:3000
-  traceId: bruno-local
-}

.github/actions/build-test-push/action.yml

@@ -60,43 +60,30 @@ runs:
     - name: Build ${{ inputs.platform }}
       id: build
       shell: bash
-      env:
-        INPUT_VERSION: ${{ inputs.version }}
-        INPUT_PLATFORM: ${{ inputs.platform }}
-        INPUT_ALTERNATE_REPOSITORY: ${{ inputs.alternate_repository }}
-        INPUT_DRY_RUN: ${{ inputs.dry_run }}
       run: |
         .github/actions/build-test-push/build.sh \
-          --version "$INPUT_VERSION" \
+          --version "${{ inputs.version }}" \
-          --platform "$INPUT_PLATFORM" \
+          --platform "${{ inputs.platform }}" \
-          --alternate-repository "$INPUT_ALTERNATE_REPOSITORY" \
+          --alternate-repository "${{ inputs.alternate_repository }}" \
-          --dry-run "$INPUT_DRY_RUN"
+          --dry-run "${{ inputs.dry_run }}"
 
     - name: Run integration tests
       if: inputs.skip_integrations_tests != 'true'
       shell: bash
-      env:
-        INPUT_VERSION: ${{ inputs.version }}
-        INPUT_PLATFORM: ${{ inputs.platform }}
-        INPUT_ALTERNATE_REPOSITORY: ${{ inputs.alternate_repository }}
-        INPUT_DRY_RUN: ${{ inputs.dry_run }}
       run: |
         .github/actions/build-test-push/test.sh \
-          --version "$INPUT_VERSION" \
+          --version "${{ inputs.version }}" \
-          --platform "$INPUT_PLATFORM" \
+          --platform "${{ inputs.platform }}" \
-          --alternate-repository "$INPUT_ALTERNATE_REPOSITORY" \
+          --alternate-repository "${{ inputs.alternate_repository }}" \
-          --dry-run "$INPUT_DRY_RUN"
+          --dry-run "${{ inputs.dry_run }}"
 
     - name: Push
       if: inputs.docker_hub_username != ''
       shell: bash
-      env:
-        INPUT_TAGS: ${{ steps.build.outputs.tags }},${{ steps.build.outputs.tags_cloud_run }},${{ steps.build.outputs.tags_aws_lambda }}
-        INPUT_DRY_RUN: ${{ inputs.dry_run }}
       run: |
         .github/actions/build-test-push/push.sh \
-          --tags "$INPUT_TAGS" \
+          --tags "${{ steps.build.outputs.tags }},${{ steps.build.outputs.tags_cloud_run }},${{ steps.build.outputs.tags_aws_lambda }}" \
-          --dry-run "$INPUT_DRY_RUN"
+          --dry-run "${{ inputs.dry_run }}"
 
     - name: Outputs
       shell: bash

.github/actions/clean/action.yml

@@ -23,12 +23,9 @@ runs:
       env:
         DOCKERHUB_USERNAME: ${{ inputs.docker_hub_username }}
         DOCKERHUB_TOKEN: ${{ inputs.docker_hub_password }}
-        INPUT_TAGS: ${{ inputs.tags }}
-        INPUT_SNAPSHOT_VERSION: ${{ inputs.snapshot_version }}
-        INPUT_DRY_RUN: ${{ inputs.dry_run }}
       shell: bash
       run: |
         .github/actions/clean/clean.sh \
-          --tags "$INPUT_TAGS" \
+          --tags "${{ inputs.tags }}" \
-          --snapshot-version "$INPUT_SNAPSHOT_VERSION" \
+          --snapshot-version "${{ inputs.snapshot_version }}" \
-          --dry-run "$INPUT_DRY_RUN"
+          --dry-run "${{ inputs.dry_run }}"

.github/actions/merge/action.yml

@@ -41,12 +41,8 @@ runs:
 
     - name: Merge
       shell: bash
-      env:
-        INPUT_TAGS: ${{ inputs.tags }}
-        INPUT_ALTERNATE_REGISTRY: ${{ inputs.alternate_registry }}
-        INPUT_DRY_RUN: ${{ inputs.dry_run }}
       run: |
         .github/actions/merge/merge.sh \
-          --tags "$INPUT_TAGS" \
+          --tags "${{ inputs.tags }}" \
-          --alternate-registry "$INPUT_ALTERNATE_REGISTRY" \
+          --alternate-registry "${{ inputs.alternate_registry }}" \
-          --dry-run "$INPUT_DRY_RUN"
+          --dry-run "${{ inputs.dry_run }}"

AGENTS.md

@@ -1,336 +1,66 @@
 # Operational Guidelines for Gotenberg
 
-You are working on **Gotenberg**, a Docker-based API for converting documents to PDF. It is a widely used production dependency. Stability and backward compatibility are paramount. When in doubt about whether a change is breaking, flag it rather than assuming it's safe.
+As an AI agent working on the Gotenberg repository, you are expected to act with the diligence and architectural foresight of a Senior Go Engineer. Gotenberg is a widely used production dependency; stability and backward compatibility are paramount.
-
+
-## Mandatory Workflow
+## 1. Core Philosophy & Stability
-
+
-Every task MUST follow these five steps in order. Do not skip any step.
+- **Backward Compatibility is Law:** This project creates a public API. Never modify existing flags, configuration environment variables, or API form fields unless explicitly instructed to perform a breaking change. If a change is breaking, it must be flagged immediately in the plan.
-
+- **Defensive Programming:** Assume input data is malformed. Handle errors explicitly. Do not panic.
-### Step 1 — Plan
+- **Atomic Commits:** Isolate refactoring from feature additions. A Pull Request should do one thing well.
-
+
-Before writing any code, produce a plan that covers:
+## 2. Development Workflow & Tooling
-
+
-- **Problem statement**: What needs to change and why.
+You must rely strictly on the project's Makefile for build and verification tasks. Do not run `go` commands directly unless debugging a specific package requires it.
-- **Proposed solution**: The recommended approach with enough detail to implement (files to modify, interface changes, pipeline positioning, form fields, etc.).
+
-- **Alternatives considered**: At least one alternative approach when pertinent, with a brief explanation of why the proposed solution is preferred.
+- **Formatting:** Run `make fmt` to format Go code before committing.
-- **Scope**: List every file that will be created or modified.
+- **Linting:**
-- **Testing strategy**: Which integration test tags will be affected, what new scenarios are needed, and whether unit tests are required.
+  - Run `make lint` to ensure Go code strictly adheres to the `.golangci.yml` configuration.
-
+  - Run `make lint-prettier` to verify formatting for non-Go files (Markdown, YAML, etc.).
-Present the plan to the user and wait for approval before proceeding to Step 2. If the user provides a plan, validate it against the codebase and flag any issues before implementing.
+  - Zero linting errors are permitted.
-
+- **Building:** Run `make build` to verify compilation and Docker image construction.
-### Step 2 — Implement
+
-
+## 3. Architecture & Code Structure
-Implement the approved plan following the coding standards and patterns described in this document. After implementation, verify the build compiles (`go build ./...`).
+
-
+- **Idiomatic Go:** Follow "Effective Go" principles.
-### Step 3 — Test
+- **Directory Separation:**
-
+  - `cmd/`: Application entry points only. Contains wiring and startup logic. **No business logic is permitted here.**
-Write or update tests based on the plan's testing strategy:
+  - `pkg/`: Core library code and modules. All business logic resides here.
-
+- **Module System:** Gotenberg is modular (e.g., Chromium, LibreOffice). When adding features, determine if they belong to an existing module or require a new strict isolation.
-- **Integration tests** (primary): Gherkin scenarios in `test/integration/features/`. See the [Integration Tests](#integration-tests) section.
+
-- **Unit tests** (when applicable): Table-driven tests in `*_test.go` files using mocks from `pkg/gotenberg/mocks.go`.
+## 4. Testing Standards
-
+
-### Step 4 — Review
+Gotenberg utilizes a split testing strategy. **Integration tests are the primary and preferred method for verifying features.**
-
+
-Self-review the implementation against the [Review Checklist](#review-checklist). Fix any issues found before presenting the result to the user.
+- **Integration Tests (`make test-integration`):**
-
+  - **First Priority:** Always start here when adding features or routes.
-### Step 5 — Commit
+  - Gotenberg uses **Gherkin (Godog)** for end-to-end verification.
-
+  - You **must** create or update the corresponding `.feature` file in `test/integration`.
-Present the review to the user and **wait for explicit approval**. Do NOT commit until the user confirms. Once approved, create a commit following the [Conventional Commits](https://www.conventionalcommits.org/) specification:
+  - These tests run within the Docker context; ensure environment consistency.
-
+- **Unit Tests (`make test-unit`):**
-```
+  - Use table-driven tests for pure logic within `pkg/`.
-<type>(<scope>): <description>
+  - Mock external dependencies (filesystem, network) where appropriate.
-```
+
-
+## 5. Documentation Requirements
-Stage only the files related to the change. Do not use `git add -A` or `git add .`.
+
-
+- **No README Updates:** Do not modify the root `README.md` unless explicitly asked.
----
+- **GoDoc is Mandatory:**
-
+  - **New Packages:** If creating a new package, you must include a `doc.go` file containing the package-level documentation.
-## Core Principles
+  - **Exported Symbols:** Every exported function, type, constant, and variable must have a proper GoDoc comment starting with its name.
-
+  - **Quality:** Comments must be complete sentences explaining _what_ the symbol does and _how_ to use it.
-- **Backward compatibility is law.** Never modify existing CLI flags, environment variables, or API form fields unless explicitly instructed to perform a breaking change. Flag any breaking change immediately.
+  - **Example:**
-- **Defensive programming.** Assume input is malformed. Handle errors explicitly. Never panic.
+    ```go
-- **Atomic commits.** One feature or fix per PR. Isolate refactoring from feature work.
+    // Convert transforms the input document to PDF using the Chromium engine.
-- **Idiomatic Go.** Follow "Effective Go" principles. All exported symbols must have GoDoc comments starting with their name.
+    // It returns an error if the connection to the browser instance fails.
-
+    func Convert(...) error
-## Project Layout
+    ```
-
+
-```
+## 6. Definition of Done
-cmd/gotenberg/       → Entry point only (wiring/startup). No business logic.
+
-pkg/gotenberg/       → Core module system, interfaces, utilities, mocks.
+A task is considered complete only when:
-pkg/modules/         → Feature modules (api, chromium, libreoffice, pdfengines, etc.).
+
-pkg/standard/        → Wires all standard modules together via imports.
+1.  The code compiles via `make build`.
-test/integration/    → Gherkin feature files + Go test infrastructure.
+2.  The code is formatted via `make fmt`.
-build/               → Dockerfile, fonts, Chromium config.
+3.  All linters pass via `make lint` and `make lint-prettier`.
-.bruno/              → Bruno API collection (mirrors every route).
+4.  Integration scenarios pass via `make test-integration`.
-```
+5.  Unit tests pass via `make test-unit`.
-
+6.  All exported symbols and new packages have compliant GoDoc.
-Key interfaces live in `pkg/gotenberg/` — `Module`, `Provisioner`, `Validator`, `Debuggable`. Every module implements `Descriptor()` and self-registers. When adding features, determine if they belong in an existing module or require a new one.
-
-## Codebase Navigation
-
-- Start with `pkg/gotenberg/` for core interfaces and `pkg/modules/` for feature implementations.
-- The integration test infrastructure in `test/integration/scenario/` is well-structured — read `scenario.go` and `containers.go` to understand the Gherkin step definitions before writing new tests.
-- Mocks for all major interfaces are in `pkg/gotenberg/mocks.go` — use them for unit tests rather than creating new ones.
-- Import ordering is enforced: standard library, third-party, then `github.com/gotenberg/gotenberg/v8` — separated by blank lines.
-- When making changes, run only the relevant integration test tag rather than the full suite (40min timeout).
-
----
-
-## Makefile — the Only Build Interface
-
-All build and verification tasks go through the Makefile. Do not run `go` commands directly unless debugging a specific package.
-
-| Command                 | Purpose                                                       | When to use                                                            |
-| ----------------------- | ------------------------------------------------------------- | ---------------------------------------------------------------------- |
-| `make build`            | Build the Docker image                                        | Before integration tests, or to verify compilation                     |
-| `make run`              | Run a Gotenberg container locally                             | Manual testing. Flags are configured via `.env` and Makefile variables |
-| `make fmt`              | Format Go code (`go fix`, `golangci-lint fmt`, `go mod tidy`) | Before every commit                                                    |
-| `make lint`             | Lint Go code (strict `.golangci.yml` config)                  | Before every commit. Zero errors permitted                             |
-| `make lint-prettier`    | Lint non-Go files (Markdown, YAML, etc.) with Prettier        | Before every commit                                                    |
-| `make prettify`         | Format non-Go files (Markdown, YAML, etc.) with Prettier      | Before every commit                                                    |
-| `make test-unit`        | Run unit tests (`go test -race ./...`)                        | After code changes to `pkg/`                                           |
-| `make test-integration` | Run integration tests (Gherkin/Godog, 40min timeout)          | After any feature or route change                                      |
-| `make godoc`            | Serve GoDoc at `localhost:6060`                               | To verify documentation                                                |
-
-## Module System
-
-Gotenberg uses a self-registering module architecture inspired by CaddyServer. Each module:
-
-- Lives in `pkg/modules/<name>/`
-- Implements the `gotenberg.Module` interface (at minimum `Descriptor()`)
-- May also implement `gotenberg.Provisioner`, `gotenberg.Validator`, or `gotenberg.Debuggable`
-- Self-registers via `init()` and is wired through `pkg/standard/`
-
-When adding a feature, first determine if it belongs in an existing module. Only create a new module if the feature represents a genuinely separate concern.
-
-## Commit Convention
-
-Commits must follow the [Conventional Commits](https://www.conventionalcommits.org/) specification:
-
-```
-<type>(<scope>): <description>
-```
-
-Common types: `feat`, `fix`, `refactor`, `test`, `docs`, `chore`, `ci`, `build`. The scope should match the module or area of the change (e.g., `chromium`, `pdfengines`, `api`).
-
-## Coding Patterns
-
-- **Error handling:** Always wrap errors with context using `fmt.Errorf("description: %w", err)`. Never swallow errors silently.
-- **Import ordering:** Enforced by `gci` — standard library, then third-party, then `github.com/gotenberg/gotenberg/v8`. Three groups separated by blank lines.
-- **Mocks:** Comprehensive mock implementations for all major interfaces live in `pkg/gotenberg/mocks.go`. Use these for unit tests.
-- **No business logic in `cmd/`:** The `cmd/gotenberg/` package is strictly for wiring and startup.
-
-## Adding PDF Engine Features
-
-When adding a new PDF engine capability (e.g., bookmarks, watermark, stamp, embed), you must update the Makefile to include the corresponding engine list variable and flag. Every `--pdfengines-*-engines` flag registered in `pkg/modules/pdfengines/pdfengines.go` must have a matching entry in the Makefile:
-
-1. **Add a variable** in the Makefile's variable block (around line 60-70):
-   ```makefile
-   PDFENGINES_<FEATURE>_ENGINES=<default engines>
-   ```
-2. **Add the flag** in the Makefile's command args block (around line 140-155):
-   ```makefile
-   --pdfengines-<feature>-engines=$(PDFENGINES_<FEATURE>_ENGINES) \
-   ```
-
-The default value should match what is defined in `pdfengines.go`'s `fs.StringSlice(...)` call for that flag.
-
----
-
-## Integration Tests
-
-- **Framework:** Gherkin (BDD) via [Godog](https://github.com/cucumber/godog), with `testcontainers-go` for Docker orchestration.
-- **Feature files:** `test/integration/features/*.feature` — one file per endpoint or capability.
-- **Test infrastructure:** `test/integration/scenario/` — Go step definitions, container management, HTTP helpers, PDF validation.
-- **Entry point:** `test/integration/main_test.go` (build tag: `integration`).
-- **Test data:** `test/integration/testdata/`
-
-### How It Works
-
-Each scenario spins up a fresh Gotenberg Docker container via testcontainers. The step definitions in `scenario/scenario.go` map Gherkin steps to Go functions. An additional `gotenberg/integration-tools` container provides PDF validation tools (`verapdf`, `pdfinfo`, `pdftotext`).
-
-**Important:** Integration tests require a Docker image. Run `make build` before `make test-integration`.
-
-### Selective Test Runs
-
-Use the `TAGS` variable to run only relevant scenarios:
-
-```bash
-make test-integration TAGS=health
-make test-integration TAGS=chromium-convert-html
-make test-integration TAGS="merge,split"
-```
-
-Available tags: `chromium`, `chromium-concurrent`, `chromium-convert-html`, `chromium-convert-markdown`, `chromium-convert-url`, `debug`, `health`, `libreoffice`, `libreoffice-convert`, `output-filename`, `pdfengines`, `pdfengines-convert`, `pdfengines-embed`, `embed`, `pdfengines-encrypt`, `encrypt`, `pdfengines-flatten`, `flatten`, `pdfengines-merge`, `merge`, `pdfengines-metadata`, `metadata`, `pdfengines-split`, `split`, `pdfengines-watermark`, `watermark`, `pdfengines-stamp`, `stamp`, `pdfengines-bookmarks`, `bookmarks`, `pdfengines-rotate`, `rotate`, `prometheus-metrics`, `root`, `version`, `webhook`, `download-from`.
-
-Other useful flags:
-
-```bash
-make test-integration NO_CONCURRENCY=true  # Disable parallel scenarios
-make test-integration PLATFORM=linux/arm64 # Force a specific platform
-```
-
-### Writing a New Integration Test
-
-1. Create or update a `.feature` file in `test/integration/features/`.
-2. Tag it appropriately (e.g., `@chromium @chromium-convert-html`).
-3. If the feature requires new tag(s), add them to both the `TAGS` comment block in the `Makefile` and the "Available tags" list in this file.
-4. If you create a new step definition, add it to `scenario/scenario.go`, register it in `InitializeScenario`, and update the "Available Gherkin Steps" list below.
-5. Test data goes in `test/integration/testdata/`.
-
-### Available Gherkin Steps
-
-**Given (setup):**
-
-- `I have a default Gotenberg container`
-- `I have a Gotenberg container with the following environment variable(s):` (table: key | value)
-- `I have a (webhook|static) server`
-
-**When (action):**
-
-- `I make a "(GET|HEAD)" request to Gotenberg at the "<endpoint>" endpoint`
-- `I make a "(GET|HEAD)" request to Gotenberg at the "<endpoint>" endpoint with the following header(s):` (table: name | value)
-- `I make a "(POST)" request to Gotenberg at the "<endpoint>" endpoint with the following form data and header(s):` (table: name | value | kind — where kind is `file`, `field`, or `header`)
-- `I make <N> concurrent "(POST)" requests to Gotenberg at the "<endpoint>" endpoint with the following form data and header(s):` (same table format)
-- `I wait for the asynchronous request to the webhook`
-
-**Then (assertions):**
-
-- `the response status code should be <code>`
-- `the (response|webhook request) header "<name>" should be "<value>"`
-- `the (response|webhook request) cookie "<name>" should be "<value>"`
-- `the (response|webhook request) body should match string:` (docstring)
-- `the (response|webhook request) body should contain string:` (docstring)
-- `the (response|webhook request) body should match JSON:` (docstring — use `"ignore"` for dynamic values like timestamps)
-- `there should be <N> PDF(s) in the (response|webhook request)`
-- `there should be the following file(s) in the (response|webhook request):` (table of filenames)
-- `the "<name>" PDF should have <N> page(s)`
-- `the "<name>" PDF (should|should NOT) be set to landscape orientation`
-- `the "<name>" PDF (should|should NOT) have the following content at page <N>:` (docstring)
-- `the (response|webhook request) PDF(s) should be valid "<standard>" with a tolerance of <N> failed rule(s)` (standards: `PDF/A-1b`, `PDF/A-2b`, `PDF/A-3b`, `PDF/UA-1`, `PDF/UA-2`)
-- `the (response|webhook request) PDF(s) (should|should NOT) be flatten`
-- `the (response|webhook request) PDF(s) (should|should NOT) be encrypted`
-- `the (response|webhook request) PDF(s) (should|should NOT) have the "<filename>" file embedded`
-- `the Gotenberg container (should|should NOT) log the following entries:` (table of log substrings)
-- `all concurrent response status codes should be <code>`
-- `all concurrent responses should have <N> PDF(s)`
-
----
-
-## Review Checklist
-
-### Backward Compatibility
-
-- [ ] No existing CLI flags renamed or removed
-- [ ] No existing environment variables renamed or removed
-- [ ] No existing API form fields renamed or removed
-- [ ] No existing HTTP endpoints changed or removed
-- [ ] No changes to default values that alter existing behavior
-
-If any of these are violated, the change **must** be flagged as a breaking change.
-
-### Linting Standards
-
-The `.golangci.yml` enforces strict rules including: `gosec`, `govet`, `errcheck`, `staticcheck`, `dupl`, `bodyclose`, `exhaustive`, `errname`, and more. Zero linting errors are permitted.
-
-Formatters enforce `gci`, `gofmt`, `gofumpt`, `goimports` with import ordering:
-
-1. Standard library
-2. Third-party packages
-3. `github.com/gotenberg/gotenberg/v8`
-
-Three groups separated by blank lines.
-
-### Code Quality
-
-- Errors are wrapped with context: `fmt.Errorf("description: %w", err)`. No swallowed errors.
-- No business logic in `cmd/`.
-- No panics in production code paths.
-- Input is validated defensively.
-- New features belong in the correct module (or justify a new one).
-
-### Documentation
-
-- Every exported function, type, constant, and variable has a GoDoc comment starting with its name.
-- New packages include a `doc.go` file.
-- `README.md` is not modified unless explicitly requested.
-
-### Definition of Done
-
-A change is ready to merge only when:
-
-1. Code compiles: `go build ./...`
-2. Code is formatted: `make fmt`
-3. All linters pass: `make lint` and `make lint-prettier`
-4. Integration tests pass: `make test-integration` (at minimum, the relevant `TAGS`)
-5. Unit tests pass: `make test-unit`
-6. All exported symbols and new packages have compliant GoDoc
-7. Bruno collection is updated (if routes were added or modified)
-
----
-
-## Bruno API Collection
-
-A [Bruno](https://www.usebruno.com/) collection lives in `.bruno/` and mirrors every Gotenberg route. When adding or updating a route, update the collection to match.
-
-### Structure
-
-```
-.bruno/
-├── bruno.json                     # Collection config
-├── collection.bru                 # Collection-level defaults (Gotenberg-Trace header)
-├── environments/
-│   ├── Local.bru                  # baseUrl: http://localhost:3000
-│   └── Demo.bru                   # baseUrl: https://demo.gotenberg.dev
-├── Health & Info/                  # GET routes
-├── Chromium/Convert/               # POST routes grouped by module
-├── Chromium/Screenshot/
-├── LibreOffice/
-└── PDF Engines/<Feature>/          # One folder per feature (Merge, Split, Rotate, …)
-```
-
-### `.bru` file format
-
-```bru
-meta {
-  name: <Human-readable name>
-  type: http
-  seq: <order within folder>
-}
-
-post {
-  url: {{baseUrl}}/forms/<path>
-  body: multipartForm
-  auth: none
-}
-
-body:multipart-form {
-  files: @file(../../test/integration/testdata/<file>)
-  <mandatoryField>: <value>
-  ~<optionalField>: <value>
-}
-
-headers {
-  ~Gotenberg-Output-Filename: <name>
-  ~Gotenberg-Webhook-Url: http://localhost:8080/webhook
-  ~Gotenberg-Webhook-Error-Url: http://localhost:8080/webhook/error
-  ~Gotenberg-Webhook-Method: POST
-  ~Gotenberg-Webhook-Error-Method: POST
-  ~Gotenberg-Webhook-Extra-Http-Headers: {"X-Custom":"value"}
-}
-```
-
-### Conventions
-
-- **Mandatory fields** are listed without prefix; **optional fields** are prefixed with `~` (disabled by default in Bruno).
-- **File references** use relative paths to `test/integration/testdata/`.
-- **Webhook and output filename headers** are included on every POST route as optional (`~`).
-- **One `.bru` file per request**. For routes with read/write variants (e.g., bookmarks, metadata), create separate files in the same folder.
-
-### Checklist when adding/updating a route
-
-1. Create or update the `.bru` file in the matching folder under `.bruno/`.
-2. Include all form fields from the route handler — check `FormData*` calls in the route function.
-3. For file upload fields (`files`, `watermark`, `stamp`, `embeds`), use `@file(...)` with a suitable test file.
-4. Verify the URL path matches the route's `Path` field exactly.
-5. If you add a new module folder, keep the naming consistent (e.g., `PDF Engines/Rotate/`).

CLAUDE.md

@@ -1,3 +0,0 @@
-# Claude Code — Gotenberg
-
-Read [AGENTS.md](AGENTS.md) first. It contains everything: core principles, project layout, coding standards, the mandatory 4-step workflow (Plan → Implement → Test → Review), integration test reference, review checklist, and Bruno collection guidelines.

CONTRIBUTING.md

@@ -1,63 +0,0 @@
-# Contributing to Gotenberg
-
-Thank you for your interest in contributing to Gotenberg! This guide will help you get started.
-
-## Before You Start
-
-Please read the [AGENTS.md](AGENTS.md) file — it describes the core principles, project layout, development standards, integration test reference, review checklist, and Bruno collection guidelines that all contributions must follow.
-
-## Getting Started
-
-### Prerequisites
-
-- Go (see version in `go.mod`)
-- Docker
-- Node.js (see version in `.node-version`) — for Prettier linting
-- [golangci-lint](https://golangci-lint.run/) v2+
-
-### Build and Run
-
-```bash
-make build # Build the Docker image
-make run   # Run a local Gotenberg container
-```
-
-### Development Loop
-
-```bash
-# Write your code, then:
-make fmt              # Format Go code
-make prettify         # Format non-Go files (Markdown, YAML, etc.)
-make lint             # Lint Go code (zero errors permitted)
-make lint-prettier    # Lint non-Go files
-make test-unit        # Run unit tests
-make build            # Build the Docker image (required before integration tests)
-make test-integration # Run all integration tests
-```
-
-To run only the integration tests relevant to your change:
-
-```bash
-make test-integration TAGS=health
-make test-integration TAGS=chromium-convert-html
-make test-integration TAGS="merge,split"
-```
-
-## Submitting a Pull Request
-
-Before opening a PR, verify:
-
-1. Code compiles: `make build`
-2. Code is formatted: `make fmt` and `make prettify`
-3. All linters pass: `make lint` and `make lint-prettier`
-4. Integration tests pass: `make test-integration` (at minimum, the relevant tags)
-5. Unit tests pass: `make test-unit`
-6. All exported symbols and new packages have GoDoc comments
-
-### Guidelines
-
-- **Conventional Commits.** Commit messages must follow the [Conventional Commits](https://www.conventionalcommits.org/) specification (e.g., `feat(chromium): add screenshot endpoint`, `fix(api): handle empty body`).
-- **One thing per PR.** Keep features, bug fixes, and refactoring in separate PRs.
-- **Backward compatibility matters.** Do not rename or remove existing CLI flags, environment variables, or API form fields without discussion.
-- **Integration tests first.** When adding a feature or route, start by writing the Gherkin scenario in `test/integration/features/`.
-- **No business logic in `cmd/`.** All logic belongs in `pkg/`.

GEMINI.md

@@ -1,3 +0,0 @@
-# Gemini — Gotenberg
-
-Read [AGENTS.md](AGENTS.md) first. It contains everything: core principles, project layout, coding standards, the mandatory 4-step workflow (Plan → Implement → Test → Review), integration test reference, review checklist, and Bruno collection guidelines.

Makefile

@@ -20,16 +20,19 @@ API_BIND_IP=
 API_START_TIMEOUT=30s
 API_TIMEOUT=30s
 API_BODY_LIMIT=
-API_ROOT_PATH="/"
+API_ROOT_PATH=/
-API_TRACE_HEADER=Gotenberg-Trace
+API_CORRELATION_ID_HEADER=Gotenberg-Trace
 API_ENABLE_BASIC_AUTH=false
 GOTENBERG_API_BASIC_AUTH_USERNAME=
 GOTENBERG_API_BASIC_AUTH_PASSWORD=
-API-DOWNLOAD-FROM-ALLOW-LIST=
+API_DOWNLOAD_FROM_ALLOW_LIST=
-API-DOWNLOAD-FROM-DENY-LIST=
+API_DOWNLOAD_FROM_DENY_LIST=
-API-DOWNLOAD-FROM-FROM-MAX-RETRY=4
+API_DOWNLOAD_FROM_MAX_RETRY=4
-API-DISABLE-DOWNLOAD-FROM=false
+API_DISABLE_DOWNLOAD_FROM=false
-API_DISABLE_HEALTH_CHECK_LOGGING=false
+API_DISABLE_HEALTH_CHECK_ROUTE_TELEMETRY=false
+API_DISABLE_ROOT_ROUTE_TELEMETRY=false
+API_DISABLE_VERSION_ROUTE_TELEMETRY=false
+API_DISABLE_DEBUG_ROUTE_TELEMETRY=false
 API_ENABLE_DEBUG_ROUTE=false
 CHROMIUM_RESTART_AFTER=100
 CHROMIUM_MAX_QUEUE_SIZE=0
@@ -54,28 +57,25 @@ LIBREOFFICE_AUTO_START=false
 LIBREOFFICE_START_TIMEOUT=20s
 LIBREOFFICE_DISABLE_ROUTES=false
 LOG_LEVEL=info
-LOG_FORMAT=auto
 LOG_FIELDS_PREFIX=
-LOG_ENABLE_GCP_FIELDS=false
+LOG_STD_FORMAT=auto
-PDFENGINES_DISABLE_ROUTES=false
+LOG_STD_ENABLE_GCP_FIELDS=false
 PDFENGINES_MERGE_ENGINES=qpdf,pdfcpu,pdftk
 PDFENGINES_SPLIT_ENGINES=pdfcpu,qpdf,pdftk
 PDFENGINES_FLATTEN_ENGINES=qpdf
 PDFENGINES_CONVERT_ENGINES=libreoffice-pdfengine
 PDFENGINES_READ_METADATA_ENGINES=exiftool
 PDFENGINES_WRITE_METADATA_ENGINES=exiftool
-PDFENGINES_READ_BOOKMARKS_ENGINES=pdfcpu
-PDFENGINES_WRITE_BOOKMARKS_ENGINES=pdfcpu
-PDFENGINES_WATERMARK_ENGINES=pdfcpu,pdftk
-PDFENGINES_STAMP_ENGINES=pdfcpu,pdftk
 PDFENGINES_ENCRYPT_ENGINES=qpdf,pdfcpu,pdftk
-PDFENGINES_ROTATE_ENGINES=pdfcpu,pdftk
+PDFENGINES_DISABLE_ROUTES=false
-PDFENGINES_EMBED_ENGINES=pdfcpu
+PDFENGINES_ADD_ATTACHMENTS_ENGINES=pdfcpu
-PROMETHEUS_NAMESPACE=gotenberg
+OTEL_SERVICE_NAME=gotenberg
-PROMETHEUS_COLLECT_INTERVAL=1s
+OTEL_TRACES_EXPORTER=none
-PROMETHEUS_DISABLE_ROUTE_LOGGING=false
+OTEL_METRICS_EXPORTER=none
-PROMETHEUS_DISABLE_COLLECT=false
+OTEL_LOGS_EXPORTER=none
-PROMETHEUS_METRICS_PATH=/prometheus/metrics
+OTEL_EXPORTER_OTLP_PROTOCOL=grpc
+OTEL_EXPORTER_OTLP_ENDPOINT=http://otel-collector:4317
+OTEL_EXPORTER_OTLP_INSECURE=true
 WEBHOOK_ENABLE_SYNC_MODE=false
 WEBHOOK_ALLOW_LIST=
 WEBHOOK_DENY_LIST=
@@ -87,88 +87,20 @@ WEBHOOK_RETRY_MAX_WAIT=30s
 WEBHOOK_CLIENT_TIMEOUT=30s
 WEBHOOK_DISABLE=false
 
+# Export all variables so they are available to Compose
+export
+
 .PHONY: run
-run: ## Start a Gotenberg container
+run: ## Start a Gotenberg container via Compose
-	docker run --rm -it \
+	docker compose up gotenberg
-	-p $(API_PORT):$(API_PORT) \
+
-	-e GOTENBERG_API_BASIC_AUTH_USERNAME=$(GOTENBERG_API_BASIC_AUTH_USERNAME) \
+.PHONY: telemetry
-	-e GOTENBERG_API_BASIC_AUTH_PASSWORD=$(GOTENBERG_API_BASIC_AUTH_PASSWORD) \
+telemetry: ## Start an OpenTelemetry collector and OpenObserve containers via Compose
-	-e TZ=$(TZ) \
+	docker compose up otel-collector openobserve
-	$(DOCKER_REGISTRY)/$(DOCKER_REPOSITORY):$(GOTENBERG_VERSION) \
+
-	gotenberg \
+.PHONY: down
-	--gotenberg-hide-banner=$(GOTENBERG_HIDE_BANNER) \
+down: ## Stop all containers
-	--gotenberg-graceful-shutdown-duration=$(GOTENBERG_GRACEFUL_SHUTDOWN_DURATION) \
+	docker compose down -v
-	--gotenberg-build-debug-data="$(GOTENBERG_BUILD_DEBUG_DATA)" \
-	--api-port=$(API_PORT) \
-	--api-port-from-env=$(API_PORT_FROM_ENV) \
-	--api-bind-ip=$(API_BIND_IP) \
-	--api-start-timeout=$(API_START_TIMEOUT) \
-	--api-timeout=$(API_TIMEOUT) \
-	--api-body-limit="$(API_BODY_LIMIT)" \
-	--api-root-path=$(API_ROOT_PATH) \
-	--api-trace-header=$(API_TRACE_HEADER) \
-	--api-enable-basic-auth=$(API_ENABLE_BASIC_AUTH) \
-	--api-download-from-allow-list=$(API-DOWNLOAD-FROM-ALLOW-LIST) \
-	--api-download-from-deny-list=$(API-DOWNLOAD-FROM-DENY-LIST) \
-	--api-download-from-max-retry=$(API-DOWNLOAD-FROM-FROM-MAX-RETRY) \
-	--api-disable-download-from=$(API-DISABLE-DOWNLOAD-FROM) \
-	--api-disable-health-check-logging=$(API_DISABLE_HEALTH_CHECK_LOGGING) \
-	--api-enable-debug-route=$(API_ENABLE_DEBUG_ROUTE) \
-	--chromium-restart-after=$(CHROMIUM_RESTART_AFTER) \
-	--chromium-auto-start=$(CHROMIUM_AUTO_START) \
-	--chromium-max-queue-size=$(CHROMIUM_MAX_QUEUE_SIZE) \
-	--chromium-max-concurrency=$(CHROMIUM_MAX_CONCURRENCY) \
-	--chromium-start-timeout=$(CHROMIUM_START_TIMEOUT) \
-	--chromium-allow-insecure-localhost=$(CHROMIUM_ALLOW_INSECURE_LOCALHOST) \
-	--chromium-ignore-certificate-errors=$(CHROMIUM_IGNORE_CERTIFICATE_ERRORS) \
-	--chromium-disable-web-security=$(CHROMIUM_DISABLE_WEB_SECURITY) \
-	--chromium-allow-file-access-from-files=$(CHROMIUM_ALLOW_FILE_ACCESS_FROM_FILES) \
-	--chromium-host-resolver-rules=$(CHROMIUM_HOST_RESOLVER_RULES) \
-	--chromium-proxy-server=$(CHROMIUM_PROXY_SERVER) \
-	--chromium-allow-list="$(CHROMIUM_ALLOW_LIST)" \
-	--chromium-deny-list="$(CHROMIUM_DENY_LIST)" \
-	--chromium-clear-cache=$(CHROMIUM_CLEAR_CACHE) \
-	--chromium-clear-cookies=$(CHROMIUM_CLEAR_COOKIES) \
-	--chromium-disable-javascript=$(CHROMIUM_DISABLE_JAVASCRIPT) \
-	--chromium-disable-routes=$(CHROMIUM_DISABLE_ROUTES) \
-	--libreoffice-restart-after=$(LIBREOFFICE_RESTART_AFTER) \
-	--libreoffice-max-queue-size=$(LIBREOFFICE_MAX_QUEUE_SIZE) \
-	--libreoffice-auto-start=$(LIBREOFFICE_AUTO_START) \
-	--libreoffice-start-timeout=$(LIBREOFFICE_START_TIMEOUT) \
-	--libreoffice-disable-routes=$(LIBREOFFICE_DISABLE_ROUTES) \
-	--log-level=$(LOG_LEVEL) \
-	--log-format=$(LOG_FORMAT) \
-	--log-fields-prefix=$(LOG_FIELDS_PREFIX) \
-	--log-enable-gcp-fields=$(LOG_ENABLE_GCP_FIELDS) \
-	--pdfengines-disable-routes=$(PDFENGINES_DISABLE_ROUTES) \
-	--pdfengines-merge-engines=$(PDFENGINES_MERGE_ENGINES) \
-	--pdfengines-split-engines=$(PDFENGINES_SPLIT_ENGINES) \
-	--pdfengines-flatten-engines=$(PDFENGINES_FLATTEN_ENGINES) \
-	--pdfengines-convert-engines=$(PDFENGINES_CONVERT_ENGINES) \
-	--pdfengines-read-metadata-engines=$(PDFENGINES_READ_METADATA_ENGINES) \
-	--pdfengines-write-metadata-engines=$(PDFENGINES_WRITE_METADATA_ENGINES) \
-	--pdfengines-read-bookmarks-engines=$(PDFENGINES_READ_BOOKMARKS_ENGINES) \
-	--pdfengines-write-bookmarks-engines=$(PDFENGINES_WRITE_BOOKMARKS_ENGINES) \
-	--pdfengines-watermark-engines=$(PDFENGINES_WATERMARK_ENGINES) \
-	--pdfengines-stamp-engines=$(PDFENGINES_STAMP_ENGINES) \
-	--pdfengines-encrypt-engines=$(PDFENGINES_ENCRYPT_ENGINES) \
-	--pdfengines-rotate-engines=$(PDFENGINES_ROTATE_ENGINES) \
-	--pdfengines-embed-engines=$(PDFENGINES_EMBED_ENGINES) \
-	--prometheus-namespace=$(PROMETHEUS_NAMESPACE) \
-	--prometheus-collect-interval=$(PROMETHEUS_COLLECT_INTERVAL) \
-	--prometheus-disable-route-logging=$(PROMETHEUS_DISABLE_ROUTE_LOGGING) \
-	--prometheus-disable-collect=$(PROMETHEUS_DISABLE_COLLECT) \
-	--prometheus-metrics-path=$(PROMETHEUS_METRICS_PATH) \
-	--webhook-enable-sync-mode="$(WEBHOOK_ENABLE_SYNC_MODE)" \
-	--webhook-allow-list="$(WEBHOOK_ALLOW_LIST)" \
-	--webhook-deny-list="$(WEBHOOK_DENY_LIST)" \
-	--webhook-error-allow-list=$(WEBHOOK_ERROR_ALLOW_LIST) \
-	--webhook-error-deny-list=$(WEBHOOK_ERROR_DENY_LIST) \
-	--webhook-max-retry=$(WEBHOOK_MAX_RETRY) \
-	--webhook-retry-min-wait=$(WEBHOOK_RETRY_MIN_WAIT) \
-	--webhook-retry-max-wait=$(WEBHOOK_RETRY_MAX_WAIT) \
-	--webhook-client-timeout=$(WEBHOOK_CLIENT_TIMEOUT) \
-	--webhook-disable=$(WEBHOOK_DISABLE)
 
 .PHONY: test-unit
 test-unit: ## Run unit tests
@@ -189,8 +121,8 @@ NO_CONCURRENCY=false
 # output-filename
 # pdfengines
 # pdfengines-convert
-# pdfengines-embed
+# pdfengines-attachments
-# embed
+# attachments
 # pdfengines-encrypt
 # encrypt
 # pdfengines-flatten
@@ -201,19 +133,11 @@ NO_CONCURRENCY=false
 # metadata
 # pdfengines-split
 # split
-# pdfengines-watermark
-# watermark
-# pdfengines-stamp
-# stamp
-# pdfengines-rotate
-# rotate
-# pdfengines-bookmarks
-# bookmarks
-# prometheus-metrics
 # root
 # version
 # webhook
 # download-from
+# telemetry
 TAGS=
 
 .PHONY: test-integration

build/Dockerfile

@@ -64,7 +64,7 @@ RUN \
 
 # Note: jdeps helps finding which modules a JAR requires.
 # Currently only for PDFtk, as we don't rely on LibreOffice UNO Java SDK.
-ENV JAVA_MODULES=java.base,java.desktop,java.naming,java.sql
+ENV JAVA_MODULES=java.base,java.desktop,java.xml
 
 RUN jlink \
     --add-modules $JAVA_MODULES \
@@ -74,6 +74,25 @@ RUN jlink \
     --compress=2 \
     --output /custom-jre
 
+# ----------------------------------------------
+# Downloader stage
+# ----------------------------------------------
+FROM debian:13-slim AS downloader-stage
+
+# See https://gitlab.com/pdftk-java/pdftk/-/releases - Binary package.
+ARG PDFTK_VERSION=v3.3.3
+
+RUN apt-get update -qq && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends curl ca-certificates
+
+WORKDIR /downloads
+
+RUN curl -Ls https://raw.githubusercontent.com/gotenberg/unoconverter/v0.2.0/unoconv -o unoconverter &&\
+    chmod +x unoconverter
+
+RUN curl -o pdftk-all.jar "https://gitlab.com/api/v4/projects/5024297/packages/generic/pdftk-java/$PDFTK_VERSION/pdftk-all.jar" &&\
+    chmod a+x pdftk-all.jar
+
 # ----------------------------------------------
 # Base image stage
 # ----------------------------------------------
@@ -81,8 +100,14 @@ FROM debian:13-slim AS base-image-stage
 
 ARG TIMEZONE=UTC
 ENV TZ=$TIMEZONE
+# Set default characterset encoding to UTF-8.
+# See:
+# https://github.com/gotenberg/gotenberg/issues/104
+# https://github.com/gotenberg/gotenberg/issues/730
+ENV LANG=C.UTF-8
+ENV LC_ALL=C.UTF-8
 
-COPY --from=custom-jre-stage /custom-jre /opt/java
+COPY --link --from=custom-jre-stage /custom-jre /opt/java
 
 ENV PATH="/opt/java/bin:${PATH}"
 
@@ -94,10 +119,6 @@ FROM base-image-stage
 ARG GOTENBERG_VERSION=snapshot
 ARG GOTENBERG_USER_GID=1001
 ARG GOTENBERG_USER_UID=1001
-# See https://github.com/googlefonts/noto-emoji/releases.
-ARG NOTO_COLOR_EMOJI_VERSION=v2.051
-# See https://gitlab.com/pdftk-java/pdftk/-/releases - Binary package.
-ARG PDFTK_VERSION=v3.3.3
 
 LABEL org.opencontainers.image.title="Gotenberg" \
     org.opencontainers.image.description="A containerized API for seamless PDF conversion." \
@@ -115,134 +136,55 @@ RUN \
     chown gotenberg: /home/gotenberg
 
 RUN \
-    # Install system dependencies required for the next instructions or debugging.
+    echo "deb http://deb.debian.org/debian trixie-backports main" >> /etc/apt/sources.list &&\
+    apt-get update -qq &&\
+    apt-get upgrade -yqq &&\
     # Note: tini is a helper for reaping zombie processes.
-    apt-get update -qq &&\
-    apt-get upgrade -yqq &&\
-    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends curl gnupg tini python3 python3-distutils-extra &&\
-    # Cleanup.
-    # Note: the Debian image does automatically a clean after each install thanks to a hook.
-    # Therefore, there is no need for apt-get clean.
-    # See https://stackoverflow.com/a/24417119/3248473.
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
-RUN \
-    # Install fonts.
-    # Credits:
-    # https://github.com/arachnys/athenapdf/blob/master/cli/Dockerfile.
-    # https://help.accusoft.com/PrizmDoc/v12.1/HTML/Installing_Asian_Fonts_on_Ubuntu_and_Debian.html.
-    curl -o ./ttf-mscorefonts-installer_3.8.1_all.deb http://httpredir.debian.org/debian/pool/contrib/m/msttcorefonts/ttf-mscorefonts-installer_3.8.1_all.deb &&\
-    apt-get update -qq &&\
-    apt-get upgrade -yqq &&\
-    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends \
-    ./ttf-mscorefonts-installer_3.8.1_all.deb \
-    culmus \
-    fonts-beng \
-    fonts-hosny-amiri \
-    fonts-lklug-sinhala \
-    fonts-lohit-guru \
-    fonts-lohit-knda \
-    fonts-samyak-gujr \
-    fonts-samyak-mlym \
-    fonts-samyak-taml \
-    fonts-sarai \
-    fonts-sil-abyssinica \
-    fonts-sil-padauk \
-    fonts-telu \
-    fonts-thai-tlwg \
-    ttf-wqy-zenhei \
-    fonts-arphic-ukai \
-    fonts-arphic-uming \
-    fonts-ipafont-mincho \
-    fonts-ipafont-gothic \
-    fonts-unfonts-core \
-    # LibreOffice recommends.
-    fonts-crosextra-caladea \
-    fonts-crosextra-carlito \
-    fonts-dejavu \
-    fonts-liberation \
-    fonts-liberation2 \
-    fonts-linuxlibertine \
-    fonts-noto-cjk \
-    fonts-noto-core \
-    fonts-noto-mono \
-    fonts-noto-ui-core \
-    fonts-sil-gentium \
-    fonts-sil-gentium-basic &&\
-    rm -f ./ttf-mscorefonts-installer_3.8.1_all.deb &&\
-    # Add Color and Black-and-White Noto emoji font.
-    # Credits:
-    # https://github.com/gotenberg/gotenberg/pull/325.
-    # https://github.com/googlefonts/noto-emoji.
-    curl -Ls "https://github.com/googlefonts/noto-emoji/raw/$NOTO_COLOR_EMOJI_VERSION/fonts/NotoColorEmoji.ttf" -o /usr/local/share/fonts/NotoColorEmoji.ttf &&\
-    # Cleanup.
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
-RUN \
-    # Install Hyphenation for LibreOffice.
-    # Credits: https://wiki.archlinux.org/title/LibreOffice.
-    apt-get update -qq &&\
-    apt-get upgrade -yqq &&\
     DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends \
+        tini python3 python3-distutils-extra \
+        # Install fonts.
+        # Essential metric-compatible fonts for LibreOffice layout fidelity (replaces MS Fonts).
+        fonts-crosextra-carlito \
+        fonts-crosextra-caladea \
+        fonts-liberation \
+        fonts-liberation2 \
+        # Reliable general-purpose fallback for Chromium.
+        fonts-dejavu \
+        # Unified CJK (Chinese, Japanese, Korean) support.
+        fonts-noto-cjk \
+        # Standard Emoji support.
+        fonts-noto-color-emoji \
+        # Install Hyphenation for LibreOffice.
+        # Credits: https://wiki.archlinux.org/title/LibreOffice.
         hyphen-af hyphen-as hyphen-be hyphen-bg hyphen-bn hyphen-ca hyphen-cs hyphen-da hyphen-de hyphen-el \
         hyphen-en-gb hyphen-en-us hyphen-eo hyphen-es hyphen-fr hyphen-gl hyphen-gu hyphen-hi hyphen-hr hyphen-hu \
         hyphen-id hyphen-is hyphen-it hyphen-kn hyphen-lt hyphen-lv hyphen-ml hyphen-mn hyphen-mr hyphen-nl \
         hyphen-no hyphen-or hyphen-pa hyphen-pl hyphen-pt-br hyphen-pt-pt hyphen-ro hyphen-ru hyphen-sk hyphen-sl \
-        hyphen-sr hyphen-sv hyphen-ta hyphen-te hyphen-th hyphen-uk hyphen-zu &&\
+        hyphen-sr hyphen-sv hyphen-ta hyphen-te hyphen-th hyphen-uk hyphen-zu \
-    # Cleanup.
+        # Install Chromium.
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+        chromium \
-
+        # Install QPDF & ExifTool (PDF engines).
-RUN \
+        qpdf exiftool &&\
-    # Install Chromium.
+    # Install LibreOffice & unoconverter.
-    apt-get update -qq &&\
+    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends -t trixie-backports \
-    apt-get upgrade -yqq &&\
+        libreoffice-writer libreoffice-calc libreoffice-impress libreoffice-draw python3-uno &&\
-    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends chromium &&\
-    # Verify installation.
-    chromium --version &&\
-    # Cleanup.
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
-# Set default characterset encoding to UTF-8.
-# See:
-# https://github.com/gotenberg/gotenberg/issues/104
-# https://github.com/gotenberg/gotenberg/issues/730
-ENV LANG=C.UTF-8
-ENV LC_ALL=C.UTF-8
-
-RUN \
-    # Install LibreOffice & unoconverter. \
-    echo "deb http://deb.debian.org/debian trixie-backports main" >> /etc/apt/sources.list &&\
-    apt-get update -qq &&\
-    apt-get upgrade -yqq &&\
-    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends -t trixie-backports libreoffice &&\
-    curl -Ls https://raw.githubusercontent.com/gotenberg/unoconverter/v0.2.0/unoconv -o /usr/bin/unoconverter &&\
-    chmod +x /usr/bin/unoconverter &&\
     # unoconverter will look for the Python binary, which has to be at version 3.
     ln -s /usr/bin/python3 /usr/bin/python &&\
-    # Verify installations.
-    libreoffice --version &&\
-    unoconverter --version &&\
-    # Cleanup.
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
-RUN \
-    # Install PDFtk, QPDF & ExifTool (PDF engines).
-    # See https://github.com/gotenberg/gotenberg/pull/273.
-    curl -o /usr/bin/pdftk-all.jar "https://gitlab.com/api/v4/projects/5024297/packages/generic/pdftk-java/$PDFTK_VERSION/pdftk-all.jar" &&\
-    chmod a+x /usr/bin/pdftk-all.jar &&\
-    printf '#!/bin/bash\n\nexec java -jar /usr/bin/pdftk-all.jar "$@"' > /usr/bin/pdftk && \
-    chmod +x /usr/bin/pdftk &&\
-    apt-get update -qq &&\
-    apt-get upgrade -yqq &&\
-    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends qpdf exiftool &&\
     # See https://github.com/nextcloud/docker/issues/380.
     mkdir -p /usr/share/man/man1 &&\
-    # Verify installations.
-    pdftk --version &&\
-    qpdf --version &&\
-    exiftool --version &&\
     # Cleanup.
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+    apt-get autoremove -yqq &&\
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /usr/share/doc/* /usr/share/man/* /usr/share/info/*
+
+# Copy downloaded artifacts (unoconverter & PDFtk).
+COPY --link --from=downloader-stage /downloads/unoconverter /usr/bin/unoconverter
+COPY --link --from=downloader-stage /downloads/pdftk-all.jar /usr/bin/pdftk-all.jar
+
+RUN \
+    # Install PDFtk bash wrapper.
+    # See https://github.com/gotenberg/gotenberg/pull/273.
+    printf '#!/bin/bash\n\nexec java -jar /usr/bin/pdftk-all.jar "$@"' > /usr/bin/pdftk && \
+    chmod +x /usr/bin/pdftk
 
 # Support for arbitrary user IDs (OpenShift).
 # See:
@@ -257,15 +199,15 @@ RUN \
 # Credits:
 # https://github.com/arachnys/athenapdf/issues/69.
 # https://github.com/arachnys/athenapdf/commit/ba25a8d80a25d08d58865519c4cd8756dc9a336d.
-COPY build/fonts.conf /etc/fonts/conf.d/100-gotenberg.conf
+COPY --link build/fonts.conf /etc/fonts/conf.d/100-gotenberg.conf
 
 # Copy dictionnaries so that hypens work on Chromium.
 # See https://github.com/gotenberg/gotenberg/issues/1293.
-COPY --chown=gotenberg:gotenberg build/chromium-hyphen-data /opt/gotenberg/chromium-hyphen-data
+COPY --link --chown="$GOTENBERG_USER_UID:$GOTENBERG_USER_GID" build/chromium-hyphen-data /opt/gotenberg/chromium-hyphen-data
 
 # Copy the Golang binaries.
-COPY --from=pdfcpu-binary-stage /home/pdfcpu /usr/bin/
+COPY --link --from=pdfcpu-binary-stage /home/pdfcpu /usr/bin/
-COPY --from=gotenberg-binary-stage /home/gotenberg /usr/bin/
+COPY --link --from=gotenberg-binary-stage /home/gotenberg /usr/bin/
 
 # Environment variables required by modules or else.
 ENV CHROMIUM_BIN_PATH=/usr/bin/chromium
@@ -284,4 +226,4 @@ WORKDIR /home/gotenberg
 EXPOSE 3000
 
 ENTRYPOINT [ "/usr/bin/tini", "--" ]
-CMD [ "gotenberg" ]
+CMD [ "gotenberg" ]

cmd/gotenberg.go

@@ -43,6 +43,10 @@ func Run() {
 	fs.Bool("gotenberg-hide-banner", false, "Hide the banner")
 	fs.Duration("gotenberg-graceful-shutdown-duration", time.Duration(30)*time.Second, "Set the graceful shutdown duration")
 	fs.Bool("gotenberg-build-debug-data", true, "Set if build data is needed")
+	fs.String("log-level", gotenberg.InfoLoggingLevel, fmt.Sprintf("Choose the level of logging detail. Options include %s, %s, %s, or %s", gotenberg.ErrorLoggingLevel, gotenberg.WarnLoggingLevel, gotenberg.InfoLoggingLevel, gotenberg.DebugLoggingLevel))
+	fs.String("log-fields-prefix", "", "Prepend a specified prefix to each field in the logs")
+	fs.String("log-std-format", gotenberg.AutoLoggingFormat, fmt.Sprintf("Specify the format of standard logging. Options include %s, %s, or %s", gotenberg.AutoLoggingFormat, gotenberg.JsonLoggingFormat, gotenberg.TextLoggingFormat))
+	fs.Bool("log-std-enable-gcp-fields", false, "Enable Google Cloud Platform fields for standard logging - namely: time, message, severity")
 
 	descriptors := gotenberg.GetModuleDescriptors()
 	var modsInfo strings.Builder
@@ -91,14 +95,43 @@ func Run() {
 	hideBanner := parsedFlags.MustBool("gotenberg-hide-banner")
 	gracefulShutdownDuration := parsedFlags.MustDuration("gotenberg-graceful-shutdown-duration")
 
+	serviceName := os.Getenv("OTEL_SERVICE_NAME")
+	if serviceName == "" {
+		serviceName = "gotenberg"
+	}
+
+	telemetryConfig := gotenberg.TelemetryConfig{
+		// OpenTelemetry.
+		ServiceName:    serviceName,
+		ServiceVersion: Version,
+		// Logging.
+		LogLevel:              parsedFlags.MustString("log-level"),
+		LogFieldsPrefix:       parsedFlags.MustString("log-fields-prefix"),
+		LogStdFormat:          parsedFlags.MustDeprecatedString("log-format", "log-std-format"),
+		LogStdEnableGcpFields: parsedFlags.MustDeprecatedBool("log-enable-gcp-fields", "log-std-enable-gcp-fields"),
+	}
+
 	if !hideBanner {
 		fmt.Printf(banner, Version)
 	}
-	fmt.Printf("[SYSTEM] modules: %s\n", modsInfo.String())
 
+	err = telemetryConfig.Validate()
+	if err != nil {
+		fmt.Printf("[FATAL] telemetry: %s\n", err)
+		os.Exit(1)
+	}
+
+	// Telemetry.
+	shutdownTelemetry, err := gotenberg.StartTelemetry(telemetryConfig)
+	if err != nil {
+		fmt.Printf("[FATAL] telemetry: %s\n", err)
+		os.Exit(1)
+	}
+
+	// Modules.
+	fmt.Printf("[SYSTEM] modules: %s\n", modsInfo.String())
 	ctx := gotenberg.NewContext(parsedFlags, descriptors)
 
-	// Start application modules.
 	apps, err := ctx.Modules(new(gotenberg.App))
 	if err != nil {
 		fmt.Printf("[FATAL] %s\n", err)
@@ -194,5 +227,12 @@ func Run() {
 		os.Exit(1)
 	}
 
+	err = shutdownTelemetry(gracefulShutdownCtx)
+	if err != nil {
+		fmt.Printf("[FATAL] telemetry: %v\n", err)
+		os.Exit(1)
+	}
+	fmt.Printf("[SYSTEM] telemetry: shutdown success\n")
+
 	os.Exit(0)
 }

compose.yaml

@@ -0,0 +1,103 @@
+services:
+  gotenberg:
+    image: ${DOCKER_REGISTRY}/${DOCKER_REPOSITORY}:${GOTENBERG_VERSION}
+    ports:
+      - "${API_PORT}:${API_PORT}"
+    environment:
+      GOTENBERG_API_BASIC_AUTH_USERNAME: ${GOTENBERG_API_BASIC_AUTH_USERNAME}
+      GOTENBERG_API_BASIC_AUTH_PASSWORD: ${GOTENBERG_API_BASIC_AUTH_PASSWORD}
+      OTEL_SERVICE_NAME: ${OTEL_SERVICE_NAME}
+      OTEL_TRACES_EXPORTER: ${OTEL_TRACES_EXPORTER}
+      OTEL_METRICS_EXPORTER: ${OTEL_METRICS_EXPORTER}
+      OTEL_LOGS_EXPORTER: ${OTEL_LOGS_EXPORTER}
+      OTEL_EXPORTER_OTLP_PROTOCOL: ${OTEL_EXPORTER_OTLP_PROTOCOL}
+      OTEL_EXPORTER_OTLP_ENDPOINT: ${OTEL_EXPORTER_OTLP_ENDPOINT}
+      OTEL_EXPORTER_OTLP_INSECURE: ${OTEL_EXPORTER_OTLP_INSECURE}
+    command:
+      - "gotenberg"
+      - "--gotenberg-hide-banner=${GOTENBERG_HIDE_BANNER}"
+      - "--gotenberg-graceful-shutdown-duration=${GOTENBERG_GRACEFUL_SHUTDOWN_DURATION}"
+      - "--gotenberg-build-debug-data=${GOTENBERG_BUILD_DEBUG_DATA}"
+      - "--api-port=${API_PORT}"
+      - "--api-port-from-env=${API_PORT_FROM_ENV}"
+      - "--api-bind-ip=${API_BIND_IP}"
+      - "--api-start-timeout=${API_START_TIMEOUT}"
+      - "--api-timeout=${API_TIMEOUT}"
+      - "--api-body-limit=${API_BODY_LIMIT}"
+      - "--api-root-path=${API_ROOT_PATH}"
+      - "--api-correlation-id-header=${API_CORRELATION_ID_HEADER}"
+      - "--api-enable-basic-auth=${API_ENABLE_BASIC_AUTH}"
+      - "--api-download-from-allow-list=${API_DOWNLOAD_FROM_ALLOW_LIST}"
+      - "--api-download-from-deny-list=${API_DOWNLOAD_FROM_DENY_LIST}"
+      - "--api-download-from-max-retry=${API_DOWNLOAD_FROM_MAX_RETRY}"
+      - "--api-disable-download-from=${API_DISABLE_DOWNLOAD_FROM}"
+      - "--api-disable-health-check-route-telemetry=${API_DISABLE_HEALTH_CHECK_ROUTE_TELEMETRY}"
+      - "--api-disable-root-route-telemetry=${API_DISABLE_ROOT_ROUTE_TELEMETRY}"
+      - "--api-disable-version-route-telemetry=${API_DISABLE_VERSION_ROUTE_TELEMETRY}"
+      - "--api-disable-debug-route-telemetry=${API_DISABLE_DEBUG_ROUTE_TELEMETRY}"
+      - "--api-enable-debug-route=${API_ENABLE_DEBUG_ROUTE}"
+      - "--chromium-restart-after=${CHROMIUM_RESTART_AFTER}"
+      - "--chromium-auto-start=${CHROMIUM_AUTO_START}"
+      - "--chromium-max-queue-size=${CHROMIUM_MAX_QUEUE_SIZE}"
+      - "--chromium-max-concurrency=${CHROMIUM_MAX_CONCURRENCY}"
+      - "--chromium-start-timeout=${CHROMIUM_START_TIMEOUT}"
+      - "--chromium-allow-insecure-localhost=${CHROMIUM_ALLOW_INSECURE_LOCALHOST}"
+      - "--chromium-ignore-certificate-errors=${CHROMIUM_IGNORE_CERTIFICATE_ERRORS}"
+      - "--chromium-disable-web-security=${CHROMIUM_DISABLE_WEB_SECURITY}"
+      - "--chromium-allow-file-access-from-files=${CHROMIUM_ALLOW_FILE_ACCESS_FROM_FILES}"
+      - "--chromium-host-resolver-rules=${CHROMIUM_HOST_RESOLVER_RULES}"
+      - "--chromium-proxy-server=${CHROMIUM_PROXY_SERVER}"
+      - "--chromium-allow-list=${CHROMIUM_ALLOW_LIST}"
+      - "--chromium-deny-list=${CHROMIUM_DENY_LIST}"
+      - "--chromium-clear-cache=${CHROMIUM_CLEAR_CACHE}"
+      - "--chromium-clear-cookies=${CHROMIUM_CLEAR_COOKIES}"
+      - "--chromium-disable-javascript=${CHROMIUM_DISABLE_JAVASCRIPT}"
+      - "--chromium-disable-routes=${CHROMIUM_DISABLE_ROUTES}"
+      - "--libreoffice-restart-after=${LIBREOFFICE_RESTART_AFTER}"
+      - "--libreoffice-max-queue-size=${LIBREOFFICE_MAX_QUEUE_SIZE}"
+      - "--libreoffice-auto-start=${LIBREOFFICE_AUTO_START}"
+      - "--libreoffice-start-timeout=${LIBREOFFICE_START_TIMEOUT}"
+      - "--libreoffice-disable-routes=${LIBREOFFICE_DISABLE_ROUTES}"
+      - "--log-level=${LOG_LEVEL}"
+      - "--log-fields-prefix=${LOG_FIELDS_PREFIX}"
+      - "--log-std-format=${LOG_STD_FORMAT}"
+      - "--log-std-enable-gcp-fields=${LOG_STD_ENABLE_GCP_FIELDS}"
+      - "--pdfengines-merge-engines=${PDFENGINES_MERGE_ENGINES}"
+      - "--pdfengines-split-engines=${PDFENGINES_SPLIT_ENGINES}"
+      - "--pdfengines-flatten-engines=${PDFENGINES_FLATTEN_ENGINES}"
+      - "--pdfengines-convert-engines=${PDFENGINES_CONVERT_ENGINES}"
+      - "--pdfengines-read-metadata-engines=${PDFENGINES_READ_METADATA_ENGINES}"
+      - "--pdfengines-write-metadata-engines=${PDFENGINES_WRITE_METADATA_ENGINES}"
+      - "--pdfengines-encrypt-engines=${PDFENGINES_ENCRYPT_ENGINES}"
+      - "--pdfengines-disable-routes=${PDFENGINES_DISABLE_ROUTES}"
+      - "--pdfengines-add-attachments-engines=${PDFENGINES_ADD_ATTACHMENTS_ENGINES}"
+      - "--webhook-enable-sync-mode=${WEBHOOK_ENABLE_SYNC_MODE}"
+      - "--webhook-allow-list=${WEBHOOK_ALLOW_LIST}"
+      - "--webhook-deny-list=${WEBHOOK_DENY_LIST}"
+      - "--webhook-error-allow-list=${WEBHOOK_ERROR_ALLOW_LIST}"
+      - "--webhook-error-deny-list=${WEBHOOK_ERROR_DENY_LIST}"
+      - "--webhook-max-retry=${WEBHOOK_MAX_RETRY}"
+      - "--webhook-retry-min-wait=${WEBHOOK_RETRY_MIN_WAIT}"
+      - "--webhook-retry-max-wait=${WEBHOOK_RETRY_MAX_WAIT}"
+      - "--webhook-client-timeout=${WEBHOOK_CLIENT_TIMEOUT}"
+      - "--webhook-disable=${WEBHOOK_DISABLE}"
+
+  otel-collector:
+    image: otel/opentelemetry-collector-contrib:latest
+    command: ["--config=/etc/otel-collector-config.yaml"]
+    volumes:
+      - ./otel-collector-config.yaml:/etc/otel-collector-config.yaml
+    ports:
+      - "4317:4317" # OTLP gRPC receiver
+    depends_on:
+      - openobserve
+
+  openobserve:
+    image: public.ecr.aws/zinclabs/openobserve:latest
+    restart: always
+    ports:
+      - "5080:5080"
+      - "5081:5081" # OTLP gRPC ingestion
+    environment:
+      ZO_ROOT_USER_EMAIL: telemetry@gotenberg.dev
+      ZO_ROOT_USER_PASSWORD: telemetry

go.mod

@@ -18,16 +18,24 @@ require (
 	github.com/labstack/gommon v0.4.2
 	github.com/mholt/archives v0.1.5
 	github.com/microcosm-cc/bluemonday v1.0.27
-	github.com/prometheus/client_golang v1.23.2
+	github.com/shirou/gopsutil/v4 v4.26.1
-	github.com/shirou/gopsutil/v4 v4.26.2
 	github.com/spf13/pflag v1.0.10
-	github.com/testcontainers/testcontainers-go v0.41.0
+	github.com/stretchr/testify v1.11.1
+	github.com/testcontainers/testcontainers-go v0.40.0
+	go.opentelemetry.io/contrib/bridges/otelslog v0.15.0
+	go.opentelemetry.io/contrib/exporters/autoexport v0.67.0
+	go.opentelemetry.io/otel v1.42.0
+	go.opentelemetry.io/otel/log v0.18.0
+	go.opentelemetry.io/otel/metric v1.42.0
+	go.opentelemetry.io/otel/sdk v1.42.0
+	go.opentelemetry.io/otel/sdk/log v0.18.0
+	go.opentelemetry.io/otel/sdk/metric v1.42.0
+	go.opentelemetry.io/otel/trace v1.42.0
 	go.uber.org/multierr v1.11.0
-	go.uber.org/zap v1.27.1
+	golang.org/x/net v0.51.0
-	golang.org/x/net v0.52.0
+	golang.org/x/sync v0.19.0
-	golang.org/x/sync v0.20.0
+	golang.org/x/term v0.40.0
-	golang.org/x/term v0.41.0
+	golang.org/x/text v0.34.0
-	golang.org/x/text v0.35.0
 )
 
 require (
@@ -67,6 +75,7 @@ require (
 	github.com/gobwas/ws v1.4.0 // indirect
 	github.com/gofrs/uuid v4.4.0+incompatible // indirect
 	github.com/gorilla/css v1.0.1 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
 	github.com/hashicorp/go-memdb v1.3.5 // indirect
@@ -79,7 +88,7 @@ require (
 	github.com/mattn/go-colorable v0.1.14 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mikelolasagasti/xz v1.0.1 // indirect
-	github.com/minio/minlz v1.1.0 // indirect
+	github.com/minio/minlz v1.0.1 // indirect
 	github.com/moby/docker-image-spec v1.3.1 // indirect
 	github.com/moby/go-archive v0.2.0 // indirect
 	github.com/moby/patternmatcher v0.6.0 // indirect
@@ -92,17 +101,18 @@ require (
 	github.com/nwaples/rardecode/v2 v2.2.2 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.1 // indirect
-	github.com/pierrec/lz4/v4 v4.1.26 // indirect
+	github.com/pierrec/lz4/v4 v4.1.25 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
+	github.com/prometheus/client_golang v1.23.2 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.67.5 // indirect
+	github.com/prometheus/otlptranslator v1.0.0 // indirect
 	github.com/prometheus/procfs v0.20.1 // indirect
 	github.com/sirupsen/logrus v1.9.4 // indirect
 	github.com/sorairolake/lzip-go v0.3.8 // indirect
 	github.com/spf13/afero v1.15.0 // indirect
-	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/tklauser/go-sysconf v0.3.16 // indirect
 	github.com/tklauser/numcpus v0.11.0 // indirect
 	github.com/ulikunitz/xz v0.5.15 // indirect
@@ -110,17 +120,28 @@ require (
 	github.com/valyala/fasttemplate v1.2.2 // indirect
 	github.com/yusufpapurcu/wmi v1.2.4 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.67.0 // indirect
+	go.opentelemetry.io/contrib/bridges/prometheus v0.67.0 // indirect
-	go.opentelemetry.io/otel v1.42.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.65.0 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.37.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.18.0 // indirect
-	go.opentelemetry.io/otel/metric v1.42.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.18.0 // indirect
-	go.opentelemetry.io/otel/trace v1.42.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.42.0 // indirect
-	go.opentelemetry.io/proto/otlp v1.7.1 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.42.0 // indirect
-	go.yaml.in/yaml/v2 v2.4.4 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.42.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.42.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.42.0 // indirect
+	go.opentelemetry.io/otel/exporters/prometheus v0.64.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.18.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.42.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.42.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.9.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.3 // indirect
 	go4.org v0.0.0-20260112195520-a5071408f32f // indirect
-	golang.org/x/crypto v0.49.0 // indirect
+	golang.org/x/crypto v0.48.0 // indirect
-	golang.org/x/sys v0.42.0 // indirect
+	golang.org/x/sys v0.41.0 // indirect
-	golang.org/x/time v0.15.0 // indirect
+	golang.org/x/time v0.14.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20260226221140-a57be14db171 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 // indirect
+	google.golang.org/grpc v1.79.2 // indirect
 	google.golang.org/protobuf v1.36.11 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -98,6 +98,8 @@ github.com/gofrs/uuid v4.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRx
 github.com/gofrs/uuid v4.3.1+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
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+github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
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 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
@@ -107,8 +109,8 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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+github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0/go.mod h1:JfhWUomR1baixubs02l85lZYYOm7LV6om4ceouMv45c=
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@@ -166,8 +168,8 @@ github.com/microcosm-cc/bluemonday v1.0.27 h1:MpEUotklkwCSLeH+Qdx1VJgNqLlpY2KXwX
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-github.com/minio/minlz v1.1.0 h1:rUOGu3EP4EqJC5k3qCsIwEnZiJULKqtRyDdqbhlvMmQ=
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-github.com/minio/minlz v1.1.0/go.mod h1:qT0aEB35q79LLornSzeDH75LBf3aH1MV+jB5w9Wasec=
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@@ -196,8 +198,8 @@ github.com/opencontainers/image-spec v1.1.1 h1:y0fUlFfIZhPF1W537XOLg0/fcx6zcHCJw
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@@ -210,13 +212,15 @@ github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNw
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-github.com/shirou/gopsutil/v4 v4.26.2 h1:X8i6sicvUFih4BmYIGT1m2wwgw2VG9YgrDTi7cIRGUI=
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-github.com/shirou/gopsutil/v4 v4.26.2/go.mod h1:LZ6ewCSkBqUpvSOf+LsTGnRinC6iaNUNMGBtDkJBaLQ=
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@@ -240,8 +244,8 @@ github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o
 github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
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-github.com/testcontainers/testcontainers-go v0.41.0 h1:mfpsD0D36YgkxGj2LrIyxuwQ9i2wCKAD+ESsYM1wais=
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-github.com/testcontainers/testcontainers-go v0.41.0/go.mod h1:pdFrEIfaPl24zmBjerWTTYaY0M6UHsqA1YSvsoU40MI=
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@@ -259,61 +263,90 @@ github.com/yusufpapurcu/wmi v1.2.4 h1:zFUKzehAFReQwLys1b/iSMl+JQGSCSjtVqQn9bBrPo
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-go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.67.0 h1:OyrsyzuttWTSur2qN/Lm0m2a8yqyIjUVBZcxFPuXq2o=
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-go.opentelemetry.io/proto/otlp v1.7.1/go.mod h1:b2rVh6rfI/s2pHWNlB7ILJcRALpcNDzKhACevjI+ZnE=
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 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
 go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
 go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
-go.uber.org/zap v1.27.1 h1:08RqriUEv8+ArZRYSTXy1LeBScaMpVSTBhCeaZYfMYc=
+go.yaml.in/yaml/v2 v2.4.3 h1:6gvOSjQoTB3vt1l+CU+tSyi/HOjfOjRLJ4YwYZGwRO0=
-go.uber.org/zap v1.27.1/go.mod h1:GB2qFLM7cTU87MWRP2mPIjqfIDnGu+VIO4V/SdhGo2E=
+go.yaml.in/yaml/v2 v2.4.3/go.mod h1:zSxWcmIDjOzPXpjlTTbAsKokqkDNAVtZO0WOMiT90s8=
-go.yaml.in/yaml/v2 v2.4.4 h1:tuyd0P+2Ont/d6e2rl3be67goVK4R6deVxCUX5vyPaQ=
-go.yaml.in/yaml/v2 v2.4.4/go.mod h1:gMZqIpDtDqOfM0uNfy0SkpRhvUryYH0Z6wdMYcacYXQ=
 go4.org v0.0.0-20260112195520-a5071408f32f h1:ziUVAjmTPwQMBmYR1tbdRFJPtTcQUI12fH9QQjfb0Sw=
 go4.org v0.0.0-20260112195520-a5071408f32f/go.mod h1:ZRJnO5ZI4zAwMFp+dS1+V6J6MSyAowhRqAE+DPa1Xp0=
-golang.org/x/crypto v0.49.0 h1:+Ng2ULVvLHnJ/ZFEq4KdcDd/cfjrrjjNSXNzxg0Y4U4=
+golang.org/x/crypto v0.48.0 h1:/VRzVqiRSggnhY7gNRxPauEQ5Drw9haKdM0jqfcCFts=
-golang.org/x/crypto v0.49.0/go.mod h1:ErX4dUh2UM+CFYiXZRTcMpEcN8b/1gxEuv3nODoYtCA=
+golang.org/x/crypto v0.48.0/go.mod h1:r0kV5h3qnFPlQnBSrULhlsRfryS2pmewsg+XfMgkVos=
-golang.org/x/net v0.52.0 h1:He/TN1l0e4mmR3QqHMT2Xab3Aj3L9qjbhRm78/6jrW0=
+golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
-golang.org/x/net v0.52.0/go.mod h1:R1MAz7uMZxVMualyPXb+VaqGSa3LIaUqk0eEt3w36Sw=
+golang.org/x/net v0.51.0/go.mod h1:aamm+2QF5ogm02fjy5Bb7CQ0WMt1/WVM7FtyaTLlA9Y=
-golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
+golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
-golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
 golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201204225414-ed752295db88/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210616094352-59db8d763f22/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
+golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
-golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
-golang.org/x/term v0.41.0 h1:QCgPso/Q3RTJx2Th4bDLqML4W6iJiaXFq2/ftQF13YU=
+golang.org/x/term v0.40.0 h1:36e4zGLqU4yhjlmxEaagx2KuYbJq3EwY8K943ZsHcvg=
-golang.org/x/term v0.41.0/go.mod h1:3pfBgksrReYfZ5lvYM0kSO0LIkAl4Yl2bXOkKP7Ec2A=
+golang.org/x/term v0.40.0/go.mod h1:w2P8uVp06p2iyKKuvXIm7N/y0UCRt3UfJTfZ7oOpglM=
-golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
+golang.org/x/text v0.34.0 h1:oL/Qq0Kdaqxa1KbNeMKwQq0reLCCaFtqu2eNuSeNHbk=
-golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
+golang.org/x/text v0.34.0/go.mod h1:homfLqTYRFyVYemLBFl5GgL/DWEiH5wcsQ5gSh1yziA=
-golang.org/x/time v0.15.0 h1:bbrp8t3bGUeFOx08pvsMYRTCVSMk89u4tKbNOZbp88U=
+golang.org/x/time v0.14.0 h1:MRx4UaLrDotUKUdCIqzPC48t1Y9hANFKIRpNx+Te8PI=
-golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
+golang.org/x/time v0.14.0/go.mod h1:eL/Oa2bBBK0TkX57Fyni+NgnyQQN4LitPmob2Hjnqw4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/genproto v0.0.0-20251202230838-ff82c1b0f217 h1:GvESR9BIyHUahIb0NcTum6itIWtdoglGX+rnGxm2934=
+gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
-google.golang.org/genproto/googleapis/api v0.0.0-20251202230838-ff82c1b0f217 h1:fCvbg86sFXwdrl5LgVcTEvNC+2txB5mgROGmRL5mrls=
+gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
-google.golang.org/genproto/googleapis/api v0.0.0-20251202230838-ff82c1b0f217/go.mod h1:+rXWjjaukWZun3mLfjmVnQi18E1AsFbDN9QdJ5YXLto=
+google.golang.org/genproto/googleapis/api v0.0.0-20260226221140-a57be14db171 h1:tu/dtnW1o3wfaxCOjSLn5IRX4YDcJrtlpzYkhHhGaC4=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251222181119-0a764e51fe1b h1:Mv8VFug0MP9e5vUxfBcE3vUkV6CImK3cMNMIDFjmzxU=
+google.golang.org/genproto/googleapis/api v0.0.0-20260226221140-a57be14db171/go.mod h1:M5krXqk4GhBKvB596udGL3UyjL4I1+cTbK0orROM9ng=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251222181119-0a764e51fe1b/go.mod h1:j9x/tPzZkyxcgEFkiKEEGxfvyumM01BEtsW8xzOahRQ=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171 h1:ggcbiqK8WWh6l1dnltU4BgWGIGo+EVYxCaAPih/zQXQ=
-google.golang.org/grpc v1.78.0 h1:K1XZG/yGDJnzMdd/uZHAkVqJE+xIDOcmdSFZkBUicNc=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260226221140-a57be14db171/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/grpc v1.78.0/go.mod h1:I47qjTo4OKbMkjA/aOOwxDIiPSBofUtQUI5EfpWvW7U=
+google.golang.org/grpc v1.79.2 h1:fRMD94s2tITpyJGtBBn7MkMseNpOZU8ZxgC3MMBaXRU=
+google.golang.org/grpc v1.79.2/go.mod h1:KmT0Kjez+0dde/v2j9vzwoAScgEPx/Bw1CYChhHLrHQ=
 google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
 google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

otel-collector-config.yaml

@@ -0,0 +1,32 @@
+receivers:
+  otlp:
+    protocols:
+      grpc:
+        endpoint: "0.0.0.0:4317"
+
+processors:
+  batch:
+
+exporters:
+  otlp/openobserve:
+    endpoint: "openobserve:5081"
+    tls:
+      insecure: true
+    headers:
+      Authorization: "Basic dGVsZW1ldHJ5QGdvdGVuYmVyZy5kZXY6dGVsZW1ldHJ5"
+      organization: "default"
+
+service:
+  pipelines:
+    traces:
+      receivers: [otlp]
+      processors: [batch]
+      exporters: [otlp/openobserve]
+    metrics:
+      receivers: [otlp]
+      processors: [batch]
+      exporters: [otlp/openobserve]
+    logs:
+      receivers: [otlp]
+      processors: [batch]
+      exporters: [otlp/openobserve]

pkg/gotenberg/cmd.go

@@ -6,17 +6,16 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log/slog"
 	"os/exec"
 	"strings"
 	"syscall"
-
-	"go.uber.org/zap"
 )
 
 // Cmd wraps an [exec.Cmd].
 type Cmd struct {
 	ctx     context.Context
-	logger  *zap.Logger
+	logger  *slog.Logger
 	process *exec.Cmd
 }
 
@@ -25,13 +24,13 @@ type Cmd struct {
 // children without creating orphans.
 //
 // See https://medium.com/@felixge/killing-a-child-process-and-all-of-its-children-in-go-54079af94773.
-func Command(logger *zap.Logger, binPath string, args ...string) *Cmd {
+func Command(logger *slog.Logger, binPath string, args ...string) *Cmd {
 	cmd := exec.Command(binPath, args...)
 	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
 
 	return &Cmd{
 		ctx:     nil,
-		logger:  logger.Named(strings.ReplaceAll(binPath, "/", "")),
+		logger:  logger.With(slog.String("logger", strings.ReplaceAll(binPath, "/", ""))),
 		process: cmd,
 	}
 }
@@ -41,7 +40,7 @@ func Command(logger *zap.Logger, binPath string, args ...string) *Cmd {
 // children without creating orphans.
 //
 // See https://medium.com/@felixge/killing-a-child-process-and-all-of-its-children-in-go-54079af94773.
-func CommandContext(ctx context.Context, logger *zap.Logger, binPath string, args ...string) (*Cmd, error) {
+func CommandContext(ctx context.Context, logger *slog.Logger, binPath string, args ...string) (*Cmd, error) {
 	if ctx == nil {
 		return nil, errors.New("nil context")
 	}
@@ -51,7 +50,7 @@ func CommandContext(ctx context.Context, logger *zap.Logger, binPath string, arg
 
 	return &Cmd{
 		ctx:     ctx,
-		logger:  logger.Named(strings.ReplaceAll(binPath, "/", "")),
+		logger:  logger.With(slog.String("logger", strings.ReplaceAll(binPath, "/", ""))),
 		process: cmd,
 	}, nil
 }
@@ -63,7 +62,7 @@ func (cmd *Cmd) Start() error {
 		return fmt.Errorf("pipe unix process output: %w", err)
 	}
 
-	cmd.logger.Debug(fmt.Sprintf("start unix process: %s", strings.Join(cmd.process.Args, " ")))
+	cmd.logger.DebugContext(cmd.ctx, fmt.Sprintf("start unix process: %s", strings.Join(cmd.process.Args, " ")))
 
 	err = cmd.process.Start()
 	if err != nil {
@@ -110,7 +109,7 @@ func (cmd *Cmd) Exec() (int, error) {
 	case err = <-errChan:
 		errProc := cmd.Kill()
 		if errProc != nil {
-			cmd.logger.Error(errProc.Error())
+			cmd.logger.ErrorContext(cmd.ctx, errProc.Error())
 		}
 
 		if err == nil {
@@ -125,7 +124,7 @@ func (cmd *Cmd) Exec() (int, error) {
 	case <-cmd.ctx.Done():
 		errProc := cmd.Kill()
 		if errProc != nil {
-			cmd.logger.Error(errProc.Error())
+			cmd.logger.ErrorContext(cmd.ctx, errProc.Error())
 		}
 
 		return 62, fmt.Errorf("context done: %w", cmd.ctx.Err())
@@ -135,8 +134,7 @@ func (cmd *Cmd) Exec() (int, error) {
 // pipeOutput creates logs entries according to the process stdout and stderr.
 // It does nothing if the logging level is not debug.
 func (cmd *Cmd) pipeOutput() error {
-	checkedEntry := cmd.logger.Check(zap.DebugLevel, "check for debug level before piping unix process output")
+	if !cmd.logger.Enabled(cmd.ctx, slog.LevelDebug) {
-	if checkedEntry == nil {
 		return nil
 	}
 
@@ -152,12 +150,12 @@ func (cmd *Cmd) pipeOutput() error {
 
 	// logCommandOutput creates logs entries according to a reader
 	// (either stdout or stderr).
-	logCommandOutput := func(logger *zap.Logger, reader io.ReadCloser) {
+	logCommandOutput := func(logger *slog.Logger, reader io.ReadCloser) {
 		r := bufio.NewReader(reader)
 		defer func(reader io.ReadCloser) {
 			err := reader.Close()
 			if err != nil && !strings.Contains(err.Error(), "file already closed") {
-				logger.Error(fmt.Sprintf("close reader: %s", err))
+				logger.ErrorContext(cmd.ctx, fmt.Sprintf("close reader: %s", err))
 			}
 		}(reader)
 
@@ -165,20 +163,20 @@ func (cmd *Cmd) pipeOutput() error {
 			line, _, err := r.ReadLine()
 			if err != nil {
 				if err != io.EOF && !strings.Contains(err.Error(), "file already closed") {
-					logger.Error(fmt.Sprintf("pipe unix process output error: %s", err))
+					logger.ErrorContext(cmd.ctx, fmt.Sprintf("pipe unix process output error: %s", err))
 				}
 
 				break
 			}
 
 			if len(line) != 0 {
-				logger.Debug(string(line))
+				logger.DebugContext(cmd.ctx, string(line))
 			}
 		}
 	}
 
-	go logCommandOutput(cmd.logger.Named("stdout"), stdout)
+	go logCommandOutput(cmd.logger.With(slog.String("logger", "stdout")), stdout)
-	go logCommandOutput(cmd.logger.Named("stderr"), stderr)
+	go logCommandOutput(cmd.logger.With(slog.String("logger", "stderr")), stderr)
 
 	return nil
 }
@@ -196,13 +194,13 @@ func (cmd *Cmd) Kill() error {
 
 	err := syscall.Kill(-cmd.process.Process.Pid, syscall.SIGKILL)
 	if err == nil {
-		cmd.logger.Debug("unix process killed")
+		cmd.logger.DebugContext(cmd.ctx, "unix process killed")
 		return nil
 	}
 
 	// If the process does not exist anymore, the error is irrelevant.
 	if strings.Contains(err.Error(), "no such process") {
-		cmd.logger.Debug("unix process already killed")
+		cmd.logger.DebugContext(cmd.ctx, "unix process already killed")
 		return nil
 	}
 

pkg/gotenberg/gc.go

@@ -1,19 +1,19 @@
 package gotenberg
 
 import (
+	"context"
 	"fmt"
+	"log/slog"
 	"os"
 	"path/filepath"
 	"strings"
 	"time"
-
-	"go.uber.org/zap"
 )
 
 // GarbageCollect scans the root path and deletes files or directories with
 // names containing specific substrings and before a given expiration time.
-func GarbageCollect(logger *zap.Logger, rootPath string, includeSubstr []string, expirationTime time.Time) error {
+func GarbageCollect(ctx context.Context, logger *slog.Logger, rootPath string, includeSubstr []string, expirationTime time.Time) error {
-	logger = logger.Named("gc")
+	logger = logger.With(slog.String("logger", "gc"))
 
 	// To make sure that the next Walk method stays on
 	// the root level of the considered path, we have to
@@ -43,7 +43,7 @@ func GarbageCollect(logger *zap.Logger, rootPath string, includeSubstr []string,
 					return fmt.Errorf("garbage collect '%s': %w", path, err)
 				}
 
-				logger.Debug(fmt.Sprintf("'%s' removed", path))
+				logger.DebugContext(ctx, fmt.Sprintf("'%s' removed", path))
 
 				return skipDirOrNil(info)
 			}

pkg/gotenberg/gc_test.go

@@ -1,14 +1,15 @@
 package gotenberg
 
 import (
+	"context"
 	"fmt"
+	"log/slog"
 	"os"
 	"path"
 	"testing"
 	"time"
 
 	"github.com/google/uuid"
-	"go.uber.org/zap"
 )
 
 func TestGarbageCollect(t *testing.T) {
@@ -66,7 +67,7 @@ func TestGarbageCollect(t *testing.T) {
 				}
 			}()
 
-			err := GarbageCollect(zap.NewNop(), tc.rootPath, tc.includeSubstr, time.Now())
+			err := GarbageCollect(context.Background(), slog.New(slog.NewJSONHandler(os.Stdout, nil)), tc.rootPath, tc.includeSubstr, time.Now())
 
 			if !tc.expectError && err != nil {
 				t.Fatalf("expected no error but got: %v", err)

pkg/gotenberg/internal/log/color.go

@@ -1,9 +1,8 @@
-package logging
+package log
 
 import (
 	"fmt"
-
+	"log/slog"
-	"go.uber.org/zap/zapcore"
 )
 
 // Foreground colors.
@@ -25,23 +24,15 @@ func (c color) Add(s string) string {
 	return fmt.Sprintf("\x1b[%dm%s\x1b[0m", uint8(c), s)
 }
 
-func levelToColor(l zapcore.Level) color {
+func levelToColor(l slog.Level) color {
 	switch l {
-	case zapcore.DebugLevel:
+	case slog.LevelDebug:
 		return cyan
-	case zapcore.InfoLevel:
+	case slog.LevelInfo:
 		return blue
-	case zapcore.WarnLevel:
+	case slog.LevelWarn:
 		return yellow
-	case zapcore.ErrorLevel:
+	case slog.LevelError:
-		return red
-	case zapcore.DPanicLevel:
-		return red
-	case zapcore.PanicLevel:
-		return red
-	case zapcore.FatalLevel:
-		return red
-	case zapcore.InvalidLevel:
 		return red
 	default:
 		return red

pkg/gotenberg/internal/log/doc.go

@@ -0,0 +1,2 @@
+// Package log gathers internal logging utilities.
+package log

pkg/gotenberg/internal/log/gcp.go

@@ -0,0 +1,18 @@
+package log
+
+import "log/slog"
+
+func gcpSeverity(l slog.Level) string {
+	switch {
+	case l < slog.LevelInfo:
+		return "DEBUG"
+	case l < slog.LevelWarn:
+		return "INFO"
+	case l < slog.LevelError:
+		return "WARNING"
+	case l >= slog.LevelError:
+		return "ERROR"
+	default:
+		return "DEFAULT"
+	}
+}

pkg/gotenberg/internal/log/handler.go

@@ -0,0 +1,171 @@
+package log
+
+import (
+	"context"
+	"errors"
+	"log/slog"
+)
+
+type gotenbergHandler struct {
+	slog.Handler
+	fieldsPrefix string
+	loggerName   string
+}
+
+func NewGotenbergHandler(next slog.Handler, prefix string) slog.Handler {
+	return &gotenbergHandler{Handler: next, fieldsPrefix: prefix}
+}
+
+func (h *gotenbergHandler) Handle(ctx context.Context, r slog.Record) error {
+	var newAttrs []slog.Attr
+
+	if h.loggerName != "" {
+		newAttrs = append(newAttrs, slog.String("logger", h.loggerName))
+	}
+
+	var needsNewRecord bool
+	if len(newAttrs) > 0 {
+		needsNewRecord = true
+	}
+
+	if h.fieldsPrefix != "" {
+		r.Attrs(func(a slog.Attr) bool {
+			if a.Key == "logger" || a.Key == "correlation_id" || a.Key == "trace_id" || a.Key == "span_id" {
+				newAttrs = append(newAttrs, a)
+				needsNewRecord = true
+				return true
+			}
+			a.Key = h.fieldsPrefix + "_" + a.Key
+			newAttrs = append(newAttrs, a)
+			needsNewRecord = true
+			return true
+		})
+	} else if needsNewRecord {
+		r.Attrs(func(a slog.Attr) bool {
+			newAttrs = append(newAttrs, a)
+			return true
+		})
+	}
+
+	if needsNewRecord {
+		newR := slog.NewRecord(r.Time, r.Level, r.Message, r.PC)
+		newR.AddAttrs(newAttrs...)
+		r = newR
+	}
+
+	return h.Handler.Handle(ctx, r)
+}
+
+func (h *gotenbergHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	var prefixed []slog.Attr
+	newLoggerName := h.loggerName
+
+	for _, a := range attrs {
+		if a.Key == "logger" {
+			if newLoggerName == "" {
+				newLoggerName = a.Value.String()
+			} else {
+				newLoggerName = newLoggerName + "." + a.Value.String()
+			}
+			continue
+		}
+
+		if h.fieldsPrefix != "" {
+			if a.Key == "correlation_id" || a.Key == "trace_id" || a.Key == "span_id" {
+				// Don't prefix these keys
+			} else {
+				a.Key = h.fieldsPrefix + "_" + a.Key
+			}
+		}
+		prefixed = append(prefixed, a)
+	}
+
+	newHandler := h.Handler
+	if len(prefixed) > 0 {
+		newHandler = h.Handler.WithAttrs(prefixed)
+	}
+
+	return &gotenbergHandler{
+		Handler:      newHandler,
+		fieldsPrefix: h.fieldsPrefix,
+		loggerName:   newLoggerName,
+	}
+}
+
+func (h *gotenbergHandler) WithGroup(name string) slog.Handler {
+	return &gotenbergHandler{
+		Handler:      h.Handler.WithGroup(name),
+		fieldsPrefix: h.fieldsPrefix,
+		loggerName:   h.loggerName,
+	}
+}
+
+type multiHandler struct {
+	handlers []slog.Handler
+}
+
+func FanOut(handlers ...slog.Handler) slog.Handler {
+	return &multiHandler{handlers: handlers}
+}
+
+func (m *multiHandler) Enabled(ctx context.Context, level slog.Level) bool {
+	for _, h := range m.handlers {
+		if h.Enabled(ctx, level) {
+			return true
+		}
+	}
+	return false
+}
+
+func (m *multiHandler) Handle(ctx context.Context, r slog.Record) error {
+	var errs []error
+	for _, h := range m.handlers {
+		if h.Enabled(ctx, r.Level) {
+			if err := h.Handle(ctx, r.Clone()); err != nil {
+				errs = append(errs, err)
+			}
+		}
+	}
+	return errors.Join(errs...)
+}
+
+func (m *multiHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	cloned := make([]slog.Handler, len(m.handlers))
+	for i, h := range m.handlers {
+		cloned[i] = h.WithAttrs(attrs)
+	}
+	return &multiHandler{handlers: cloned}
+}
+
+func (m *multiHandler) WithGroup(name string) slog.Handler {
+	cloned := make([]slog.Handler, len(m.handlers))
+	for i, h := range m.handlers {
+		cloned[i] = h.WithGroup(name)
+	}
+	return &multiHandler{handlers: cloned}
+}
+
+type levelHandler struct {
+	slog.Handler
+	level slog.Level
+}
+
+func LevelFilter(next slog.Handler, level slog.Level) slog.Handler {
+	return &levelHandler{Handler: next, level: level}
+}
+
+func (h *levelHandler) Enabled(ctx context.Context, level slog.Level) bool {
+	return level >= h.level && h.Handler.Enabled(ctx, level)
+}
+
+func (h *levelHandler) Handle(ctx context.Context, r slog.Record) error {
+	return h.Handler.Handle(ctx, r)
+}
+
+func (h *levelHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return &levelHandler{Handler: h.Handler.WithAttrs(attrs), level: h.level}
+}
+
+func (h *levelHandler) WithGroup(name string) slog.Handler {
+	return &levelHandler{Handler: h.Handler.WithGroup(name), level: h.level}
+}

pkg/gotenberg/internal/log/log.go

@@ -0,0 +1,37 @@
+package log
+
+import (
+	"log/slog"
+	"sync"
+)
+
+// InitLogger initializes the global logger.
+func InitLogger(handler slog.Handler) {
+	if logger != nil {
+		return
+	}
+
+	mu.Lock()
+	defer mu.Unlock()
+
+	// Double check: ensure it wasn't initialized while we waited for the lock.
+	if logger != nil {
+		return
+	}
+
+	logger = slog.New(handler)
+}
+
+// Logger returns the global logger.
+func Logger() *slog.Logger {
+	mu.Lock()
+	defer mu.Unlock()
+
+	return logger
+}
+
+// logger is Singleton so that we instantiate our [slog.Logger] only once.
+var (
+	logger *slog.Logger
+	mu     sync.Mutex
+)

pkg/gotenberg/internal/log/stdhandler.go

@@ -0,0 +1,127 @@
+package log
+
+import (
+	"context"
+	"log/slog"
+	"os"
+	"strings"
+
+	"go.opentelemetry.io/otel/trace"
+	"golang.org/x/term"
+)
+
+const (
+	autoLoggingFormat = "auto"
+	jsonLoggingFormat = "json"
+	textLoggingFormat = "text"
+)
+
+// traceContextHandler is an internal wrapper that specifically injects
+// trace_id and span_id into the log record before they are written to the standard output.
+type traceContextHandler struct {
+	slog.Handler
+}
+
+func (h traceContextHandler) Handle(ctx context.Context, r slog.Record) error {
+	if spanCtx := trace.SpanContextFromContext(ctx); spanCtx.IsValid() {
+		// Since slog.Record is immutable with regards to adding attributes in-place,
+		// we must clone and add them.
+		newR := slog.NewRecord(r.Time, r.Level, r.Message, r.PC)
+		r.Attrs(func(a slog.Attr) bool {
+			newR.AddAttrs(a)
+			return true
+		})
+		newR.AddAttrs(
+			slog.String("trace_id", spanCtx.TraceID().String()),
+			slog.String("span_id", spanCtx.SpanID().String()),
+		)
+		r = newR
+	}
+
+	return h.Handler.Handle(ctx, r)
+}
+
+func (h traceContextHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return traceContextHandler{Handler: h.Handler.WithAttrs(attrs)}
+}
+
+func (h traceContextHandler) WithGroup(name string) slog.Handler {
+	return traceContextHandler{Handler: h.Handler.WithGroup(name)}
+}
+
+// NewStdHandler returns a [slog.Handler] instance for the standard output.
+func NewStdHandler(level slog.Level, format string, fieldsPrefix string, enableGcpFields bool) (slog.Handler, error) {
+	// #nosec: G115
+	isTerminal := term.IsTerminal(int(os.Stdout.Fd()))
+
+	// Normalize the log format based on the output device.
+	if format == autoLoggingFormat {
+		if isTerminal {
+			format = textLoggingFormat
+		} else {
+			format = jsonLoggingFormat
+		}
+	}
+
+	opts := &slog.HandlerOptions{
+		Level: level,
+	}
+
+	opts.ReplaceAttr = func(groups []string, a slog.Attr) slog.Attr {
+		// Configure level encoding based on format and GCP settings.
+		if a.Key == slog.LevelKey {
+			l := a.Value.Any().(slog.Level)
+			if format == textLoggingFormat && isTerminal {
+				if enableGcpFields {
+					a.Value = slog.StringValue(gcpSeverityColorEncoder(l))
+				} else {
+					a.Value = slog.StringValue(levelToColor(l).Add(l.String()))
+				}
+			} else if enableGcpFields && format != textLoggingFormat {
+				a.Key = "severity"
+				a.Value = slog.StringValue(gcpSeverity(l))
+			} else {
+				a.Value = slog.StringValue(strings.ToLower(l.String()))
+			}
+		}
+
+		if a.Key == slog.TimeKey {
+			if enableGcpFields && format != textLoggingFormat {
+				a.Key = "time"
+			} else {
+				a.Key = "ts"
+			}
+
+			if isTerminal {
+				a.Value = slog.StringValue(a.Value.Time().Local().Format("2006/01/02 15:04:05.000"))
+			} else if !enableGcpFields {
+				a.Value = slog.Float64Value(float64(a.Value.Time().UnixNano()) / 1e9)
+			}
+		}
+
+		if a.Key == slog.MessageKey {
+			if enableGcpFields && format != textLoggingFormat {
+				a.Key = "message"
+			} else {
+				a.Key = "msg"
+			}
+		}
+
+		return a
+	}
+
+	var handler slog.Handler
+	if format == textLoggingFormat {
+		handler = slog.NewTextHandler(os.Stderr, opts)
+	} else {
+		handler = slog.NewJSONHandler(os.Stderr, opts)
+	}
+
+	return traceContextHandler{Handler: handler}, nil
+}
+
+func gcpSeverityColorEncoder(l slog.Level) string {
+	severity := gcpSeverity(l)
+	c := levelToColor(l)
+	return c.Add(severity)
+}

pkg/gotenberg/internal/otel/doc.go

@@ -0,0 +1,8 @@
+// Package otel gathers initialization utilities for OpenTelemetry
+// instrumentation.
+//
+// This package has been significantly inspired by
+// https://github.com/lucavallin/gotel.
+//
+// See: https://opentelemetry.io/.
+package otel

pkg/gotenberg/internal/otel/otel.go

@@ -0,0 +1,166 @@
+package otel
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os"
+	"sync/atomic"
+
+	"go.opentelemetry.io/contrib/bridges/otelslog"
+	"go.opentelemetry.io/contrib/exporters/autoexport"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/log/global"
+	"go.opentelemetry.io/otel/propagation"
+	"go.opentelemetry.io/otel/sdk/log"
+	"go.opentelemetry.io/otel/sdk/metric"
+	"go.opentelemetry.io/otel/sdk/resource"
+	"go.opentelemetry.io/otel/sdk/trace"
+	semconv "go.opentelemetry.io/otel/semconv/v1.40.0"
+)
+
+// InitTracerProvider initializes the OpenTelemetry tracer provider.
+func InitTracerProvider(logger *slog.Logger, serviceName, serviceVersion string) (shutdown func(context.Context) error, err error) {
+	initOtelLogger(logger)
+
+	ctx := context.Background()
+	hostname, err := os.Hostname()
+	if err != nil {
+		return nil, fmt.Errorf("get hostname: %w", err)
+	}
+
+	res, err := resource.Merge(
+		resource.Default(),
+		resource.NewWithAttributes(
+			semconv.SchemaURL,
+			semconv.ServiceName(serviceName),
+			semconv.ServiceVersion(serviceVersion),
+			semconv.HostName(hostname),
+		),
+	)
+	if err != nil {
+		return nil, fmt.Errorf("merge resource: %w", err)
+	}
+
+	traceOpts := []trace.TracerProviderOption{
+		trace.WithResource(res),
+	}
+
+	traceExporter, err := autoexport.NewSpanExporter(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	if !autoexport.IsNoneSpanExporter(traceExporter) {
+		traceOpts = append(traceOpts, trace.WithBatcher(traceExporter))
+	}
+
+	traceProvider := trace.NewTracerProvider(traceOpts...)
+	otel.SetTracerProvider(traceProvider)
+
+	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(
+		propagation.TraceContext{},
+		propagation.Baggage{},
+	))
+
+	return traceProvider.Shutdown, nil
+}
+
+// InitMeterProvider initializes the OpenTelemetry meter provider.
+func InitMeterProvider(logger *slog.Logger, serviceName, serviceVersion string) (shutdown func(context.Context) error, err error) {
+	initOtelLogger(logger)
+
+	ctx := context.Background()
+	hostname, err := os.Hostname()
+	if err != nil {
+		return nil, fmt.Errorf("get hostname: %w", err)
+	}
+
+	res, err := resource.Merge(
+		resource.Default(),
+		resource.NewWithAttributes(
+			semconv.SchemaURL,
+			semconv.ServiceName(serviceName),
+			semconv.ServiceVersion(serviceVersion),
+			semconv.HostName(hostname),
+		),
+	)
+	if err != nil {
+		return nil, fmt.Errorf("merge resource: %w", err)
+	}
+
+	metricOpts := []metric.Option{
+		metric.WithResource(res),
+	}
+
+	metricReader, err := autoexport.NewMetricReader(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	if !autoexport.IsNoneMetricReader(metricReader) {
+		metricOpts = append(metricOpts, metric.WithReader(metricReader))
+	}
+
+	meterProvider := metric.NewMeterProvider(metricOpts...)
+	otel.SetMeterProvider(meterProvider)
+
+	return meterProvider.Shutdown, nil
+}
+
+// InitLoggerProvider initializes the OpenTelemetry logger provider.
+func InitLoggerProvider(logger *slog.Logger, serviceName, serviceVersion string) (shutdown func(context.Context) error, handler slog.Handler, err error) {
+	initOtelLogger(logger)
+
+	ctx := context.Background()
+	hostname, err := os.Hostname()
+	if err != nil {
+		return nil, nil, fmt.Errorf("get hostname: %w", err)
+	}
+
+	res, err := resource.Merge(
+		resource.Default(),
+		resource.NewWithAttributes(
+			semconv.SchemaURL,
+			semconv.ServiceName(serviceName),
+			semconv.ServiceVersion(serviceVersion),
+			semconv.HostName(hostname),
+		),
+	)
+	if err != nil {
+		return nil, nil, fmt.Errorf("merge resource: %w", err)
+	}
+
+	logOpts := []log.LoggerProviderOption{
+		log.WithResource(res),
+	}
+
+	logExporter, err := autoexport.NewLogExporter(ctx)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if !autoexport.IsNoneLogExporter(logExporter) {
+		logOpts = append(logOpts, log.WithProcessor(log.NewBatchProcessor(logExporter)))
+	}
+
+	loggerProvider := log.NewLoggerProvider(logOpts...)
+	otelHandler := otelslog.NewHandler(serviceName, otelslog.WithLoggerProvider(loggerProvider))
+	global.SetLoggerProvider(loggerProvider)
+
+	return loggerProvider.Shutdown, otelHandler, nil
+}
+
+func initOtelLogger(logger *slog.Logger) {
+	if otlpLoggerInitialized.Load() {
+		return
+	}
+
+	otel.SetErrorHandler(otel.ErrorHandlerFunc(func(err error) {
+		logger.Error(err.Error())
+	}))
+
+	otlpLoggerInitialized.Store(true)
+}
+
+var otlpLoggerInitialized atomic.Bool

pkg/gotenberg/logging.go

@@ -1,57 +0,0 @@
-package gotenberg
-
-import (
-	"fmt"
-
-	"github.com/hashicorp/go-retryablehttp"
-	"go.uber.org/zap"
-)
-
-// LoggerProvider is an interface for a module that supplies a method for
-// creating a [zap.Logger] instance for use by other modules.
-//
-//	func (m *YourModule) Provision(ctx *gotenberg.Context) error {
-//		provider, _ := ctx.Module(new(gotenberg.LoggerProvider))
-//		logger, _   := provider.(gotenberg.LoggerProvider).Logger(m)
-//	}
-type LoggerProvider interface {
-	Logger(mod Module) (*zap.Logger, error)
-}
-
-// LeveledLogger is a wrapper around a [zap.Logger] so that it may be used by a
-// [retryablehttp.Client].
-type LeveledLogger struct {
-	logger *zap.Logger
-}
-
-// NewLeveledLogger instantiates a [LeveledLogger].
-func NewLeveledLogger(logger *zap.Logger) *LeveledLogger {
-	return &LeveledLogger{
-		logger: logger,
-	}
-}
-
-// Error logs a message at the error level using the wrapped zap.Logger.
-func (leveled LeveledLogger) Error(msg string, keysAndValues ...any) {
-	leveled.logger.Error(fmt.Sprintf("%s: %+v", msg, keysAndValues))
-}
-
-// Warn logs a message at the warning level using the wrapped zap.Logger.
-func (leveled LeveledLogger) Warn(msg string, keysAndValues ...any) {
-	leveled.logger.Warn(fmt.Sprintf("%s: %+v", msg, keysAndValues))
-}
-
-// Info logs a message at the info level using the wrapped zap.Logger.
-func (leveled LeveledLogger) Info(msg string, keysAndValues ...any) {
-	leveled.logger.Info(fmt.Sprintf("%s: %+v", msg, keysAndValues))
-}
-
-// Debug logs a message at the debug level using the wrapped zap.Logger.
-func (leveled LeveledLogger) Debug(msg string, keysAndValues ...any) {
-	leveled.logger.Debug(fmt.Sprintf("%s: %+v", msg, keysAndValues))
-}
-
-// Interface guards.
-var (
-	_ retryablehttp.LeveledLogger = (*LeveledLogger)(nil)
-)

pkg/gotenberg/metrics.go

@@ -1,26 +0,0 @@
-package gotenberg
-
-// Metric represents a unitary metric.
-type Metric struct {
-	// Name is the unique identifier.
-	// Required.
-	Name string
-
-	// Description describes the metric.
-	// Optional.
-	Description string
-
-	// Read returns the current value.
-	// Required.
-	Read func() float64
-}
-
-// MetricsProvider is a module interface which provides a list of [Metric].
-//
-//	func (m *YourModule) Provision(ctx *gotenberg.Context) error {
-//		provider, _ := ctx.Module(new(gotenberg.MetricsProvider))
-//		metrics, _  := provider.(gotenberg.MetricsProvider).Metrics()
-//	}
-type MetricsProvider interface {
-	Metrics() ([]Metric, error)
-}

pkg/gotenberg/mocks.go

@@ -2,9 +2,8 @@ package gotenberg
 
 import (
 	"context"
+	"log/slog"
 	"os"
-
-	"go.uber.org/zap"
 )
 
 // ModuleMock is a mock for the [Module] interface.
@@ -46,76 +45,46 @@ func (mod *DebuggableMock) Debug() map[string]any {
 //
 //nolint:dupl
 type PdfEngineMock struct {
-	MergeMock          func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error
+	MergeMock          func(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error
-	SplitMock          func(ctx context.Context, logger *zap.Logger, mode SplitMode, inputPath, outputDirPath string) ([]string, error)
+	SplitMock          func(ctx context.Context, logger *slog.Logger, mode SplitMode, inputPath, outputDirPath string) ([]string, error)
-	FlattenMock        func(ctx context.Context, logger *zap.Logger, inputPath string) error
+	FlattenMock        func(ctx context.Context, logger *slog.Logger, inputPath string) error
-	ConvertMock        func(ctx context.Context, logger *zap.Logger, formats PdfFormats, inputPath, outputPath string) error
+	ConvertMock        func(ctx context.Context, logger *slog.Logger, formats PdfFormats, inputPath, outputPath string) error
-	ReadMetadataMock   func(ctx context.Context, logger *zap.Logger, inputPath string) (map[string]any, error)
+	ReadMetadataMock   func(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error)
-	PageCountMock      func(ctx context.Context, logger *zap.Logger, inputPath string) (int, error)
+	WriteMetadataMock  func(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error
-	WriteMetadataMock  func(ctx context.Context, logger *zap.Logger, metadata map[string]any, inputPath string) error
+	EncryptMock        func(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error
-	ReadBookmarksMock  func(ctx context.Context, logger *zap.Logger, inputPath string) ([]Bookmark, error)
+	AddAttachmentsMock func(ctx context.Context, logger *slog.Logger, filePaths []string, inputPath string) error
-	EncryptMock        func(ctx context.Context, logger *zap.Logger, inputPath, userPassword, ownerPassword string) error
-	EmbedFilesMock     func(ctx context.Context, logger *zap.Logger, filePaths []string, inputPath string) error
-	WriteBookmarksMock func(ctx context.Context, logger *zap.Logger, inputPath string, bookmarks []Bookmark) error
-	WatermarkMock      func(ctx context.Context, logger *zap.Logger, inputPath string, stamp Stamp) error
-	StampMock          func(ctx context.Context, logger *zap.Logger, inputPath string, stamp Stamp) error
-	RotateMock         func(ctx context.Context, logger *zap.Logger, inputPath string, angle int, pages string) error
 }
 
-func (engine *PdfEngineMock) Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+func (engine *PdfEngineMock) Merge(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
 	return engine.MergeMock(ctx, logger, inputPaths, outputPath)
 }
 
-func (engine *PdfEngineMock) Split(ctx context.Context, logger *zap.Logger, mode SplitMode, inputPath, outputDirPath string) ([]string, error) {
+func (engine *PdfEngineMock) Split(ctx context.Context, logger *slog.Logger, mode SplitMode, inputPath, outputDirPath string) ([]string, error) {
 	return engine.SplitMock(ctx, logger, mode, inputPath, outputDirPath)
 }
 
-func (engine *PdfEngineMock) Flatten(ctx context.Context, logger *zap.Logger, inputPath string) error {
+func (engine *PdfEngineMock) Flatten(ctx context.Context, logger *slog.Logger, inputPath string) error {
 	return engine.FlattenMock(ctx, logger, inputPath)
 }
 
-func (engine *PdfEngineMock) Convert(ctx context.Context, logger *zap.Logger, formats PdfFormats, inputPath, outputPath string) error {
+func (engine *PdfEngineMock) Convert(ctx context.Context, logger *slog.Logger, formats PdfFormats, inputPath, outputPath string) error {
 	return engine.ConvertMock(ctx, logger, formats, inputPath, outputPath)
 }
 
-func (engine *PdfEngineMock) ReadMetadata(ctx context.Context, logger *zap.Logger, inputPath string) (map[string]any, error) {
+func (engine *PdfEngineMock) ReadMetadata(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
 	return engine.ReadMetadataMock(ctx, logger, inputPath)
 }
 
-func (engine *PdfEngineMock) PageCount(ctx context.Context, logger *zap.Logger, inputPath string) (int, error) {
+func (engine *PdfEngineMock) WriteMetadata(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
-	return engine.PageCountMock(ctx, logger, inputPath)
-}
-
-func (engine *PdfEngineMock) WriteMetadata(ctx context.Context, logger *zap.Logger, metadata map[string]any, inputPath string) error {
 	return engine.WriteMetadataMock(ctx, logger, metadata, inputPath)
 }
 
-func (engine *PdfEngineMock) ReadBookmarks(ctx context.Context, logger *zap.Logger, inputPath string) ([]Bookmark, error) {
+func (engine *PdfEngineMock) Encrypt(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
-	return engine.ReadBookmarksMock(ctx, logger, inputPath)
-}
-
-func (engine *PdfEngineMock) Encrypt(ctx context.Context, logger *zap.Logger, inputPath, userPassword, ownerPassword string) error {
 	return engine.EncryptMock(ctx, logger, inputPath, userPassword, ownerPassword)
 }
 
-func (engine *PdfEngineMock) EmbedFiles(ctx context.Context, logger *zap.Logger, filePaths []string, inputPath string) error {
+func (engine *PdfEngineMock) AddAttachments(ctx context.Context, logger *slog.Logger, filePaths []string, inputPath string) error {
-	return engine.EmbedFilesMock(ctx, logger, filePaths, inputPath)
+	return engine.AddAttachmentsMock(ctx, logger, filePaths, inputPath)
-}
-
-func (engine *PdfEngineMock) WriteBookmarks(ctx context.Context, logger *zap.Logger, inputPath string, bookmarks []Bookmark) error {
-	return engine.WriteBookmarksMock(ctx, logger, inputPath, bookmarks)
-}
-
-func (engine *PdfEngineMock) Watermark(ctx context.Context, logger *zap.Logger, inputPath string, stamp Stamp) error {
-	return engine.WatermarkMock(ctx, logger, inputPath, stamp)
-}
-
-func (engine *PdfEngineMock) Stamp(ctx context.Context, logger *zap.Logger, inputPath string, stamp Stamp) error {
-	return engine.StampMock(ctx, logger, inputPath, stamp)
-}
-
-func (engine *PdfEngineMock) Rotate(ctx context.Context, logger *zap.Logger, inputPath string, angle int, pages string) error {
-	return engine.RotateMock(ctx, logger, inputPath, angle, pages)
 }
 
 // PdfEngineProviderMock is a mock for the [PdfEngineProvider] interface.
@@ -129,31 +98,32 @@ func (provider *PdfEngineProviderMock) PdfEngine() (PdfEngine, error) {
 
 // ProcessMock is a mock for the [Process] interface.
 type ProcessMock struct {
-	StartMock   func(logger *zap.Logger) error
+	StartMock   func(logger *slog.Logger) error
-	StopMock    func(logger *zap.Logger) error
+	StopMock    func(logger *slog.Logger) error
-	HealthyMock func(logger *zap.Logger) bool
+	HealthyMock func(logger *slog.Logger) bool
 }
 
-func (p *ProcessMock) Start(logger *zap.Logger) error {
+func (p *ProcessMock) Start(logger *slog.Logger) error {
 	return p.StartMock(logger)
 }
 
-func (p *ProcessMock) Stop(logger *zap.Logger) error {
+func (p *ProcessMock) Stop(logger *slog.Logger) error {
 	return p.StopMock(logger)
 }
 
-func (p *ProcessMock) Healthy(logger *zap.Logger) bool {
+func (p *ProcessMock) Healthy(logger *slog.Logger) bool {
 	return p.HealthyMock(logger)
 }
 
 // ProcessSupervisorMock is a mock for the [ProcessSupervisor] interface.
 type ProcessSupervisorMock struct {
-	LaunchMock        func() error
+	LaunchMock           func() error
-	ShutdownMock      func() error
+	ShutdownMock         func() error
-	HealthyMock       func() bool
+	HealthyMock          func() bool
-	RunMock           func(ctx context.Context, logger *zap.Logger, task func() error) error
+	RunMock              func(ctx context.Context, logger *slog.Logger, task func() error) error
-	ReqQueueSizeMock  func() int64
+	ReqQueueSizeMock     func() int64
-	RestartsCountMock func() int64
+	ActiveTasksCountMock func() int64
+	RestartsCountMock    func() int64
 }
 
 func (s *ProcessSupervisorMock) Launch() error {
@@ -168,7 +138,7 @@ func (s *ProcessSupervisorMock) Healthy() bool {
 	return s.HealthyMock()
 }
 
-func (s *ProcessSupervisorMock) Run(ctx context.Context, logger *zap.Logger, task func() error) error {
+func (s *ProcessSupervisorMock) Run(ctx context.Context, logger *slog.Logger, task func() error) error {
 	return s.RunMock(ctx, logger, task)
 }
 
@@ -176,28 +146,14 @@ func (s *ProcessSupervisorMock) ReqQueueSize() int64 {
 	return s.ReqQueueSizeMock()
 }
 
+func (s *ProcessSupervisorMock) ActiveTasksCount() int64 {
+	return s.ActiveTasksCountMock()
+}
+
 func (s *ProcessSupervisorMock) RestartsCount() int64 {
 	return s.RestartsCountMock()
 }
 
-// LoggerProviderMock is a mock for the [LoggerProvider] interface.
-type LoggerProviderMock struct {
-	LoggerMock func(mod Module) (*zap.Logger, error)
-}
-
-func (provider *LoggerProviderMock) Logger(mod Module) (*zap.Logger, error) {
-	return provider.LoggerMock(mod)
-}
-
-// MetricsProviderMock is a mock for the [MetricsProvider] interface.
-type MetricsProviderMock struct {
-	MetricsMock func() ([]Metric, error)
-}
-
-func (provider *MetricsProviderMock) Metrics() ([]Metric, error) {
-	return provider.MetricsMock()
-}
-
 // MkdirAllMock is a mock for the [MkdirAll] interface.
 type MkdirAllMock struct {
 	MkdirAllMock func(path string, perm os.FileMode) error
@@ -224,8 +180,6 @@ var (
 	_ PdfEngineProvider = (*PdfEngineProviderMock)(nil)
 	_ Process           = (*ProcessMock)(nil)
 	_ ProcessSupervisor = (*ProcessSupervisorMock)(nil)
-	_ LoggerProvider    = (*LoggerProviderMock)(nil)
-	_ MetricsProvider   = (*MetricsProviderMock)(nil)
 	_ MkdirAll          = (*MkdirAllMock)(nil)
 	_ PathRename        = (*PathRenameMock)(nil)
 )

pkg/gotenberg/pdfengine.go

@@ -4,8 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-
+	"log/slog"
-	"go.uber.org/zap"
 )
 
 var (
@@ -28,14 +27,6 @@ var (
 	// ErrPdfEncryptionNotSupported is returned when encryption
 	// is not supported by the PDF engine.
 	ErrPdfEncryptionNotSupported = errors.New("encryption not supported")
-
-	// ErrPdfStampSourceNotSupported is returned when a stamp source type
-	// is not supported by the PDF engine.
-	ErrPdfStampSourceNotSupported = errors.New("stamp source not supported")
-
-	// ErrPdfRotateAngleNotSupported is returned when the rotation angle is
-	// not supported.
-	ErrPdfRotateAngleNotSupported = errors.New("rotation angle not supported")
 )
 
 // PdfEngineInvalidArgsError represents an error returned by a PDF engine when
@@ -57,33 +48,6 @@ func NewPdfEngineInvalidArgs(engine, msg string) error {
 	return &PdfEngineInvalidArgsError{engine, msg}
 }
 
-const (
-	// StampSourceText represents a text-based stamp source.
-	StampSourceText string = "text"
-
-	// StampSourceImage represents an image-based stamp source.
-	StampSourceImage string = "image"
-
-	// StampSourcePDF represents a PDF-based stamp source.
-	StampSourcePDF string = "pdf"
-)
-
-// Stamp gathers the data required to apply a watermark or stamp to a PDF.
-type Stamp struct {
-	// Source is one of "text", "image", or "pdf".
-	Source string
-
-	// Expression is the text content (for text source) or file path (for
-	// image/pdf source).
-	Expression string
-
-	// Pages is the optional page range to apply the stamp to.
-	Pages string
-
-	// Options holds engine-specific styling options.
-	Options map[string]string
-}
-
 const (
 	// SplitModeIntervals represents a mode where a PDF is split at specific
 	// intervals.
@@ -144,14 +108,6 @@ type PdfFormats struct {
 	PdfUa bool
 }
 
-// Bookmark represents a node in the PDF document's outline
-// (table of contents).
-type Bookmark struct {
-	Title    string     `json:"title"`
-	Page     int        `json:"page"`
-	Children []Bookmark `json:"children,omitempty"`
-}
-
 // PdfEngine provides an interface for operations on PDFs. Implementations
 // can use various tools like PDFtk, or implement functionality directly in
 // Go.
@@ -160,57 +116,36 @@ type Bookmark struct {
 type PdfEngine interface {
 	// Merge combines multiple PDFs into a single PDF. The resulting page order
 	// is determined by the order of files provided in inputPaths.
-	Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error
+	Merge(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error
 
 	// Split splits a given PDF file.
-	Split(ctx context.Context, logger *zap.Logger, mode SplitMode, inputPath, outputDirPath string) ([]string, error)
+	Split(ctx context.Context, logger *slog.Logger, mode SplitMode, inputPath, outputDirPath string) ([]string, error)
 
 	// Flatten merges existing annotation appearances with page content,
 	// effectively deleting the original annotations. This process can flatten
 	// forms as well as forms share a relationship with annotations. Note that
 	// this operation is irreversible.
-	Flatten(ctx context.Context, logger *zap.Logger, inputPath string) error
+	Flatten(ctx context.Context, logger *slog.Logger, inputPath string) error
 
 	// Convert transforms a given PDF to the specified formats defined in
 	// PdfFormats. If no format, it does nothing.
-	Convert(ctx context.Context, logger *zap.Logger, formats PdfFormats, inputPath, outputPath string) error
+	Convert(ctx context.Context, logger *slog.Logger, formats PdfFormats, inputPath, outputPath string) error
 
 	// ReadMetadata extracts the metadata of a given PDF file.
-	ReadMetadata(ctx context.Context, logger *zap.Logger, inputPath string) (map[string]any, error)
+	ReadMetadata(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error)
-
-	// PageCount returns the number of pages in a PDF file.
-	PageCount(ctx context.Context, logger *zap.Logger, inputPath string) (int, error)
 
 	// WriteMetadata writes the metadata into a given PDF file.
-	WriteMetadata(ctx context.Context, logger *zap.Logger, metadata map[string]any, inputPath string) error
+	WriteMetadata(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error
-
-	// ReadBookmarks reads the document outline (bookmarks) of a PDF file.
-	ReadBookmarks(ctx context.Context, logger *zap.Logger, inputPath string) ([]Bookmark, error)
-
-	// WriteBookmarks adds a document outline (bookmarks) to a PDF file.
-	// The bookmarks parameter represents the hierarchical tree of the outline.
-	WriteBookmarks(ctx context.Context, logger *zap.Logger, inputPath string, bookmarks []Bookmark) error
 
 	// Encrypt adds password protection to a PDF file.
 	// The userPassword is required to open the document.
 	// The ownerPassword provides full access to the document.
 	// If the ownerPassword is empty, it defaults to the userPassword.
-	Encrypt(ctx context.Context, logger *zap.Logger, inputPath, userPassword, ownerPassword string) error
+	Encrypt(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error
 
-	// EmbedFiles embeds files into a PDF. All files are embedded as file attachments
+	// AddAttachments adds attachments into a PDF. All files are attached as
-	// without modifying the main PDF content.
+	// file attachments without modifying the main PDF content.
-	// TODO: attachments instead? Rename the route?
+	AddAttachments(ctx context.Context, logger *slog.Logger, filePaths []string, inputPath string) error
-	EmbedFiles(ctx context.Context, logger *zap.Logger, filePaths []string, inputPath string) error
-
-	// Watermark applies a watermark (behind page content) to a PDF file.
-	Watermark(ctx context.Context, logger *zap.Logger, inputPath string, stamp Stamp) error
-
-	// Stamp applies a stamp (on top of page content) to a PDF file.
-	Stamp(ctx context.Context, logger *zap.Logger, inputPath string, stamp Stamp) error
-
-	// Rotate rotates pages of a PDF file by the given angle (90, 180, 270).
-	// If pages is empty, all pages are rotated.
-	Rotate(ctx context.Context, logger *zap.Logger, inputPath string, angle int, pages string) error
 }
 
 // PdfEngineProvider offers an interface to instantiate a [PdfEngine].

pkg/gotenberg/semconv/bench_test.go

@@ -0,0 +1,48 @@
+// Code generated by gotmpl. DO NOT MODIFY.
+// source: internal/shared/semconv/bench_test.go.tmpl
+
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package semconv
+
+import (
+	"net/http"
+	"net/url"
+	"testing"
+
+	"go.opentelemetry.io/otel/attribute"
+)
+
+var benchHTTPServerRequestResults []attribute.KeyValue
+
+// BenchmarkHTTPServerRequest allows comparison between different version of the HTTP server.
+// To use an alternative start this test with OTEL_SEMCONV_STABILITY_OPT_IN set to the
+// version under test.
+func BenchmarkHTTPServerRequest(b *testing.B) {
+	// Request was generated from TestHTTPServerRequest request.
+	req := &http.Request{
+		Method: http.MethodGet,
+		URL: &url.URL{
+			Path: "/",
+		},
+		Proto:      "HTTP/1.1",
+		ProtoMajor: 1,
+		ProtoMinor: 1,
+		Header: http.Header{
+			"User-Agent":      []string{"Go-http-client/1.1"},
+			"Accept-Encoding": []string{"gzip"},
+		},
+		Body:       http.NoBody,
+		Host:       "127.0.0.1:39093",
+		RemoteAddr: "127.0.0.1:38738",
+		RequestURI: "/",
+	}
+	serv := NewHTTPServer(nil)
+
+	b.ReportAllocs()
+	b.ResetTimer()
+	for range b.N {
+		benchHTTPServerRequestResults = serv.RequestTraceAttrs("", req, RequestTraceAttrsOpts{})
+	}
+}

pkg/gotenberg/semconv/client.go

@@ -0,0 +1,308 @@
+// Code generated by gotmpl. DO NOT MODIFY.
+// source: internal/shared/semconv/client.go.tmpl
+
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Package semconv provides OpenTelemetry semantic convention types and
+// functionality.
+package semconv // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv"
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"reflect"
+	"slices"
+	"strconv"
+	"strings"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/semconv/v1.39.0"
+	"go.opentelemetry.io/otel/semconv/v1.39.0/httpconv"
+)
+
+type HTTPClient struct {
+	requestBodySize httpconv.ClientRequestBodySize
+	requestDuration httpconv.ClientRequestDuration
+}
+
+func NewHTTPClient(meter metric.Meter) HTTPClient {
+	client := HTTPClient{}
+
+	var err error
+	client.requestBodySize, err = httpconv.NewClientRequestBodySize(meter)
+	handleErr(err)
+
+	client.requestDuration, err = httpconv.NewClientRequestDuration(
+		meter,
+		metric.WithExplicitBucketBoundaries(0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5, 10),
+	)
+	handleErr(err)
+
+	return client
+}
+
+func (n HTTPClient) Status(code int) (codes.Code, string) {
+	if code == 0 {
+		return codes.Error, "No HTTP status code"
+	}
+	if code < 100 || code >= 600 {
+		return codes.Error, fmt.Sprintf("Invalid HTTP status code %d", code)
+	}
+	if code >= 400 {
+		return codes.Error, http.StatusText(code)
+	}
+	return codes.Ok,  ""
+}
+
+// RequestTraceAttrs returns trace attributes for an HTTP request made by a client.
+func (n HTTPClient) RequestTraceAttrs(req *http.Request) []attribute.KeyValue {
+	/*
+	 below attributes are returned:
+	 - http.request.method
+	 - http.request.method.original
+	 - url.full
+	 - server.address
+	 - server.port
+	 - network.protocol.name
+	 - network.protocol.version
+	*/
+	numOfAttributes := 3 // URL, server address, proto, and method.
+
+	var urlHost string
+	if req.URL != nil {
+		urlHost = req.URL.Host
+	}
+	var requestHost string
+	var requestPort int
+	for _, hostport := range []string{urlHost, req.Header.Get("Host")} {
+		requestHost, requestPort = SplitHostPort(hostport)
+		if requestHost != "" || requestPort > 0 {
+			break
+		}
+	}
+
+	eligiblePort := requiredHTTPPort(req.URL != nil && req.URL.Scheme == "https", requestPort)
+	if eligiblePort > 0 {
+		numOfAttributes++
+	}
+	useragent := req.UserAgent()
+	if useragent != "" {
+		numOfAttributes++
+	}
+
+	protoName, protoVersion := netProtocol(req.Proto)
+	if protoName != "" && protoName != "http" {
+		numOfAttributes++
+	}
+	if protoVersion != "" {
+		numOfAttributes++
+	}
+
+	method, originalMethod := n.method(req.Method)
+	if originalMethod != (attribute.KeyValue{}) {
+		numOfAttributes++
+	}
+
+	attrs := make([]attribute.KeyValue, 0, numOfAttributes)
+
+	attrs = append(attrs, method)
+	if originalMethod != (attribute.KeyValue{}) {
+		attrs = append(attrs, originalMethod)
+	}
+
+	var u string
+	if req.URL != nil {
+		// Remove any username/password info that may be in the URL.
+		userinfo := req.URL.User
+		req.URL.User = nil
+		u = req.URL.String()
+		// Restore any username/password info that was removed.
+		req.URL.User = userinfo
+	}
+	attrs = append(attrs, semconv.URLFull(u))
+
+	attrs = append(attrs, semconv.ServerAddress(requestHost))
+	if eligiblePort > 0 {
+		attrs = append(attrs, semconv.ServerPort(eligiblePort))
+	}
+
+	if protoName != "" && protoName != "http" {
+		attrs = append(attrs, semconv.NetworkProtocolName(protoName))
+	}
+	if protoVersion != "" {
+		attrs = append(attrs, semconv.NetworkProtocolVersion(protoVersion))
+	}
+
+	return attrs
+}
+
+// ResponseTraceAttrs returns trace attributes for an HTTP response made by a client.
+func (n HTTPClient) ResponseTraceAttrs(resp *http.Response) []attribute.KeyValue {
+	/*
+	 below attributes are returned:
+	 - http.response.status_code
+	 - error.type
+	*/
+	var count int
+	if resp.StatusCode > 0 {
+		count++
+	}
+
+	if isErrorStatusCode(resp.StatusCode) {
+		count++
+	}
+
+	attrs := make([]attribute.KeyValue, 0, count)
+	if resp.StatusCode > 0 {
+		attrs = append(attrs, semconv.HTTPResponseStatusCode(resp.StatusCode))
+	}
+
+	if isErrorStatusCode(resp.StatusCode) {
+		errorType := strconv.Itoa(resp.StatusCode)
+		attrs = append(attrs, semconv.ErrorTypeKey.String(errorType))
+	}
+	return attrs
+}
+
+func (n HTTPClient) ErrorType(err error) attribute.KeyValue {
+	t := reflect.TypeOf(err)
+	var value string
+	if t.PkgPath() == "" && t.Name() == "" {
+		// Likely a builtin type.
+		value = t.String()
+	} else {
+		value = fmt.Sprintf("%s.%s", t.PkgPath(), t.Name())
+	}
+
+	if value == "" {
+		return semconv.ErrorTypeOther
+	}
+
+	return semconv.ErrorTypeKey.String(value)
+}
+
+func (n HTTPClient) method(method string) (attribute.KeyValue, attribute.KeyValue) {
+	if method == "" {
+		return semconv.HTTPRequestMethodGet, attribute.KeyValue{}
+	}
+	if attr, ok := methodLookup[method]; ok {
+		return attr, attribute.KeyValue{}
+	}
+
+	orig := semconv.HTTPRequestMethodOriginal(method)
+	if attr, ok := methodLookup[strings.ToUpper(method)]; ok {
+		return attr, orig
+	}
+	return semconv.HTTPRequestMethodGet, orig
+}
+
+func (n HTTPClient) MetricAttributes(req *http.Request, statusCode int, additionalAttributes []attribute.KeyValue) []attribute.KeyValue {
+	num := len(additionalAttributes) + 2
+	var h string
+	if req.URL != nil {
+		h = req.URL.Host
+	}
+	var requestHost string
+	var requestPort int
+	for _, hostport := range []string{h, req.Header.Get("Host")} {
+		requestHost, requestPort = SplitHostPort(hostport)
+		if requestHost != "" || requestPort > 0 {
+			break
+		}
+	}
+
+	port := requiredHTTPPort(req.URL != nil && req.URL.Scheme == "https", requestPort)
+	if port > 0 {
+		num++
+	}
+
+	protoName, protoVersion := netProtocol(req.Proto)
+	if protoName != "" {
+		num++
+	}
+	if protoVersion != "" {
+		num++
+	}
+
+	if statusCode > 0 {
+		num++
+	}
+
+	attributes := slices.Grow(additionalAttributes, num)
+	attributes = append(attributes,
+		semconv.HTTPRequestMethodKey.String(standardizeHTTPMethod(req.Method)),
+		semconv.ServerAddress(requestHost),
+		n.scheme(req),
+	)
+
+	if port > 0 {
+		attributes = append(attributes, semconv.ServerPort(port))
+	}
+	if protoName != "" {
+		attributes = append(attributes, semconv.NetworkProtocolName(protoName))
+	}
+	if protoVersion != "" {
+		attributes = append(attributes, semconv.NetworkProtocolVersion(protoVersion))
+	}
+
+	if statusCode > 0 {
+		attributes = append(attributes, semconv.HTTPResponseStatusCode(statusCode))
+	}
+	return attributes
+}
+
+type MetricOpts struct {
+	measurement metric.MeasurementOption
+	addOptions  metric.AddOption
+}
+
+func (o MetricOpts) MeasurementOption() metric.MeasurementOption {
+	return o.measurement
+}
+
+func (o MetricOpts) AddOptions() metric.AddOption {
+	return o.addOptions
+}
+
+func (n HTTPClient) MetricOptions(ma MetricAttributes) map[string]MetricOpts {
+	opts := map[string]MetricOpts{}
+
+	attributes := n.MetricAttributes(ma.Req, ma.StatusCode, ma.AdditionalAttributes)
+	set := metric.WithAttributeSet(attribute.NewSet(attributes...))
+	opts["new"] = MetricOpts{
+		measurement: set,
+		addOptions:  set,
+	}
+
+	return opts
+}
+
+func (n HTTPClient) RecordMetrics(ctx context.Context, md MetricData, opts map[string]MetricOpts) {
+	n.requestBodySize.Inst().Record(ctx, md.RequestSize, opts["new"].MeasurementOption())
+	n.requestDuration.Inst().Record(ctx, md.ElapsedTime/1000, opts["new"].MeasurementOption())
+}
+
+// TraceAttributes returns attributes for httptrace.
+func (n HTTPClient) TraceAttributes(host string) []attribute.KeyValue {
+	return []attribute.KeyValue{
+		semconv.ServerAddress(host),
+	}
+}
+
+func (n HTTPClient) scheme(req *http.Request) attribute.KeyValue {
+	if req.URL != nil && req.URL.Scheme != "" {
+		return semconv.URLScheme(req.URL.Scheme)
+	}
+	if req.TLS != nil {
+		return semconv.URLScheme("https")
+	}
+	return semconv.URLScheme("http")
+}
+
+func isErrorStatusCode(code int) bool {
+	return code >= 400 || code < 100
+}

pkg/gotenberg/semconv/client_test.go

@@ -0,0 +1,182 @@
+// Code generated by gotmpl. DO NOT MODIFY.
+// source: internal/shared/semconv/client_test.go.tmpl
+
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package semconv
+
+import (
+	"net/http"
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
+)
+
+func TestHTTPClientStatus(t *testing.T) {
+	tests := []struct {
+		code int
+		stat codes.Code
+		msg  bool
+	}{
+		{0, codes.Error, true},
+		{http.StatusContinue, codes.Ok, false},
+		{http.StatusSwitchingProtocols, codes.Ok, false},
+		{http.StatusProcessing, codes.Ok, false},
+		{http.StatusEarlyHints, codes.Ok, false},
+		{http.StatusOK, codes.Ok, false},
+		{http.StatusCreated, codes.Ok, false},
+		{http.StatusAccepted, codes.Ok, false},
+		{http.StatusNonAuthoritativeInfo, codes.Ok, false},
+		{http.StatusNoContent, codes.Ok, false},
+		{http.StatusResetContent, codes.Ok, false},
+		{http.StatusPartialContent, codes.Ok, false},
+		{http.StatusMultiStatus, codes.Ok, false},
+		{http.StatusAlreadyReported, codes.Ok, false},
+		{http.StatusIMUsed, codes.Ok, false},
+		{http.StatusMultipleChoices, codes.Ok, false},
+		{http.StatusMovedPermanently, codes.Ok, false},
+		{http.StatusFound, codes.Ok, false},
+		{http.StatusSeeOther, codes.Ok, false},
+		{http.StatusNotModified, codes.Ok, false},
+		{http.StatusUseProxy, codes.Ok, false},
+		{306, codes.Ok, false},
+		{http.StatusTemporaryRedirect, codes.Ok, false},
+		{http.StatusPermanentRedirect, codes.Ok, false},
+		{http.StatusBadRequest, codes.Error, true},
+		{http.StatusUnauthorized, codes.Error, true},
+		{http.StatusPaymentRequired, codes.Error, true},
+		{http.StatusForbidden, codes.Error, true},
+		{http.StatusNotFound, codes.Error, true},
+		{http.StatusMethodNotAllowed, codes.Error, true},
+		{http.StatusNotAcceptable, codes.Error, true},
+		{http.StatusProxyAuthRequired, codes.Error, true},
+		{http.StatusRequestTimeout, codes.Error, true},
+		{http.StatusConflict, codes.Error, true},
+		{http.StatusGone, codes.Error, true},
+		{http.StatusLengthRequired, codes.Error, true},
+		{http.StatusPreconditionFailed, codes.Error, true},
+		{http.StatusRequestEntityTooLarge, codes.Error, true},
+		{http.StatusRequestURITooLong, codes.Error, true},
+		{http.StatusUnsupportedMediaType, codes.Error, true},
+		{http.StatusRequestedRangeNotSatisfiable, codes.Error, true},
+		{http.StatusExpectationFailed, codes.Error, true},
+		{http.StatusTeapot, codes.Error, true},
+		{http.StatusMisdirectedRequest, codes.Error, true},
+		{http.StatusUnprocessableEntity, codes.Error, true},
+		{http.StatusLocked, codes.Error, true},
+		{http.StatusFailedDependency, codes.Error, true},
+		{http.StatusTooEarly, codes.Error, true},
+		{http.StatusUpgradeRequired, codes.Error, true},
+		{http.StatusPreconditionRequired, codes.Error, true},
+		{http.StatusTooManyRequests, codes.Error, true},
+		{http.StatusRequestHeaderFieldsTooLarge, codes.Error, true},
+		{http.StatusUnavailableForLegalReasons, codes.Error, true},
+		{499, codes.Error, false},
+		{http.StatusInternalServerError, codes.Error, true},
+		{http.StatusNotImplemented, codes.Error, true},
+		{http.StatusBadGateway, codes.Error, true},
+		{http.StatusServiceUnavailable, codes.Error, true},
+		{http.StatusGatewayTimeout, codes.Error, true},
+		{http.StatusHTTPVersionNotSupported, codes.Error, true},
+		{http.StatusVariantAlsoNegotiates, codes.Error, true},
+		{http.StatusInsufficientStorage, codes.Error, true},
+		{http.StatusLoopDetected, codes.Error, true},
+		{http.StatusNotExtended, codes.Error, true},
+		{http.StatusNetworkAuthenticationRequired, codes.Error, true},
+		{600, codes.Error, true},
+	}
+
+	for _, test := range tests {
+		t.Run(strconv.Itoa(test.code), func(t *testing.T) {
+			c, msg := HTTPClient{}.Status(test.code)
+			assert.Equal(t, test.stat, c)
+			if test.msg && msg == "" {
+				t.Errorf("expected non-empty message for %d", test.code)
+			} else if !test.msg && msg != "" {
+				t.Errorf("expected empty message for %d, got: %s", test.code, msg)
+			}
+		})
+	}
+}
+
+func TestHTTPClient_MetricAttributes(t *testing.T) {
+	defaultRequest, err := http.NewRequest("GET", "http://example.com/path?query=test", http.NoBody)
+	require.NoError(t, err)
+	httpsRequest, err := http.NewRequest("GET", "https://example.com/path?query=test", http.NoBody)
+	require.NoError(t, err)
+
+	tests := []struct {
+		name                 string
+		server               string
+		req                  *http.Request
+		statusCode           int
+		additionalAttributes []attribute.KeyValue
+		wantFunc             func(t *testing.T, attrs []attribute.KeyValue)
+	}{
+		{
+			name:                 "routine testing",
+			req:                  defaultRequest,
+			statusCode:           200,
+			additionalAttributes: []attribute.KeyValue{attribute.String("test", "test")},
+			wantFunc: func(t *testing.T, attrs []attribute.KeyValue) {
+				require.Len(t, attrs, 7)
+				assert.ElementsMatch(t, []attribute.KeyValue{
+					attribute.String("http.request.method", "GET"),
+					attribute.String("server.address", "example.com"),
+					attribute.String("url.scheme", "http"),
+					attribute.String("network.protocol.name", "http"),
+					attribute.String("network.protocol.version", "1.1"),
+					attribute.Int64("http.response.status_code", 200),
+					attribute.String("test", "test"),
+				}, attrs)
+			},
+		},
+		{
+			name:                 "use server address",
+			req:                  defaultRequest,
+			statusCode:           200,
+			additionalAttributes: nil,
+			wantFunc: func(t *testing.T, attrs []attribute.KeyValue) {
+				require.Len(t, attrs, 6)
+				assert.ElementsMatch(t, []attribute.KeyValue{
+					attribute.String("http.request.method", "GET"),
+					attribute.String("server.address", "example.com"),
+					attribute.String("url.scheme", "http"),
+					attribute.String("network.protocol.name", "http"),
+					attribute.String("network.protocol.version", "1.1"),
+					attribute.Int64("http.response.status_code", 200),
+				}, attrs)
+			},
+		},
+		{
+			name:                 "https scheme",
+			req:                  httpsRequest,
+			statusCode:           200,
+			additionalAttributes: nil,
+			wantFunc: func(t *testing.T, attrs []attribute.KeyValue) {
+				require.Len(t, attrs, 6)
+				assert.ElementsMatch(t, []attribute.KeyValue{
+					attribute.String("http.request.method", "GET"),
+					attribute.String("server.address", "example.com"),
+					attribute.String("url.scheme", "https"),
+					attribute.String("network.protocol.name", "http"),
+					attribute.String("network.protocol.version", "1.1"),
+					attribute.Int64("http.response.status_code", 200),
+				}, attrs)
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := HTTPClient{}.MetricAttributes(tt.req, tt.statusCode, tt.additionalAttributes)
+			tt.wantFunc(t, got)
+		})
+	}
+}

pkg/gotenberg/semconv/common_test.go

@@ -0,0 +1,71 @@
+// Code generated by gotmpl. DO NOT MODIFY.
+// source: internal/shared/semconv/common_test.go.tmpl
+
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package semconv_test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg/semconv"
+	"go.opentelemetry.io/otel/attribute"
+)
+
+type testServerReq struct {
+	hostname   string
+	serverPort int
+	peerAddr   string
+	peerPort   int
+	clientIP   string
+}
+
+func testTraceRequest(t *testing.T, serv semconv.HTTPServer, want func(testServerReq) []attribute.KeyValue) {
+	t.Helper()
+
+	got := make(chan *http.Request, 1)
+	handler := func(w http.ResponseWriter, r *http.Request) {
+		got <- r
+		close(got)
+		w.WriteHeader(http.StatusOK)
+	}
+
+	srv := httptest.NewServer(http.HandlerFunc(handler))
+	defer srv.Close()
+
+	srvURL, err := url.Parse(srv.URL)
+	require.NoError(t, err)
+	srvPort, err := strconv.ParseInt(srvURL.Port(), 10, 32)
+	require.NoError(t, err)
+
+	resp, err := srv.Client().Get(srv.URL)
+	require.NoError(t, err)
+	require.NoError(t, resp.Body.Close())
+
+	req := <-got
+	peer, peerPort := semconv.SplitHostPort(req.RemoteAddr)
+
+	const user = "alice"
+	req.SetBasicAuth(user, "pswrd")
+
+	const clientIP = "127.0.0.5"
+	req.Header.Add("X-Forwarded-For", clientIP)
+
+	srvReq := testServerReq{
+		hostname:   srvURL.Hostname(),
+		serverPort: int(srvPort),
+		peerAddr:   peer,
+		peerPort:   peerPort,
+		clientIP:   clientIP,
+	}
+
+	assert.ElementsMatch(t, want(srvReq), serv.RequestTraceAttrs("", req, semconv.RequestTraceAttrsOpts{}))
+}

pkg/gotenberg/semconv/doc.go

@@ -0,0 +1,7 @@
+// Package semconv is a copy/paste of utilities that are currently not exposed
+// in the OpenTelemery Go SDK.
+//
+// This package MUST be removed once an "official" API is provided.
+//
+// See: https://github.com/open-telemetry/opentelemetry-go-contrib/issues/4580.
+package semconv

pkg/gotenberg/semconv/gen.go

@@ -0,0 +1,15 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package semconv // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv"
+
+// Generate semconv package:
+//go:generate gotmpl --body=../../../../../../internal/shared/semconv/bench_test.go.tmpl "--data={ \"pkg\": \"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp\" }" --out=bench_test.go
+//go:generate gotmpl --body=../../../../../../internal/shared/semconv/common_test.go.tmpl "--data={ \"pkg\": \"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp\" }" --out=common_test.go
+//go:generate gotmpl --body=../../../../../../internal/shared/semconv/server.go.tmpl "--data={ \"pkg\": \"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp\" }" --out=server.go
+//go:generate gotmpl --body=../../../../../../internal/shared/semconv/server_test.go.tmpl "--data={ \"pkg\": \"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp\" }" --out=server_test.go
+//go:generate gotmpl --body=../../../../../../internal/shared/semconv/client.go.tmpl "--data={ \"pkg\": \"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp\" }" --out=client.go
+//go:generate gotmpl --body=../../../../../../internal/shared/semconv/client_test.go.tmpl "--data={ \"pkg\": \"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp\" }" --out=client_test.go
+//go:generate gotmpl --body=../../../../../../internal/shared/semconv/httpconvtest_test.go.tmpl "--data={ \"pkg\": \"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp\" }" --out=httpconvtest_test.go
+//go:generate gotmpl --body=../../../../../../internal/shared/semconv/util.go.tmpl "--data={ \"pkg\": \"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp\" }" --out=util.go
+//go:generate gotmpl --body=../../../../../../internal/shared/semconv/util_test.go.tmpl "--data={ \"pkg\": \"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp\" }" --out=util_test.go

pkg/gotenberg/semconv/httpconvtest_test.go

@@ -0,0 +1,455 @@
+// Code generated by gotmpl. DO NOT MODIFY.
+// source: internal/shared/semconv/httpconv_test.go.tmpl
+
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package semconv_test
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg/semconv"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/sdk/instrumentation"
+	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
+	"go.opentelemetry.io/otel/sdk/metric/metricdata"
+	"go.opentelemetry.io/otel/sdk/metric/metricdata/metricdatatest"
+)
+
+func TestNewTraceRequest(t *testing.T) {
+	serv := semconv.NewHTTPServer(nil)
+	want := func(req testServerReq) []attribute.KeyValue {
+		return []attribute.KeyValue{
+			attribute.String("http.request.method", "GET"),
+			attribute.String("url.scheme", "http"),
+			attribute.String("server.address", req.hostname),
+			attribute.Int("server.port", req.serverPort),
+			attribute.String("network.peer.address", req.peerAddr),
+			attribute.Int("network.peer.port", req.peerPort),
+			attribute.String("user_agent.original", "Go-http-client/1.1"),
+			attribute.String("client.address", req.clientIP),
+			attribute.String("network.protocol.version", "1.1"),
+			attribute.String("url.path", "/"),
+		}
+	}
+	testTraceRequest(t, serv, want)
+}
+
+func TestNewServerRecordMetrics(t *testing.T) {
+	oldAttrs := attribute.NewSet(
+		attribute.String("http.scheme", "http"),
+		attribute.String("http.method", "POST"),
+		attribute.Int64("http.status_code", 301),
+		attribute.String("key", "value"),
+		attribute.String("net.host.name", "stuff"),
+		attribute.String("net.protocol.name", "http"),
+		attribute.String("net.protocol.version", "1.1"),
+	)
+
+	currAttrs := attribute.NewSet(
+		attribute.String("http.request.method", "POST"),
+		attribute.Int64("http.response.status_code", 301),
+		attribute.String("key", "value"),
+		attribute.String("network.protocol.name", "http"),
+		attribute.String("network.protocol.version", "1.1"),
+		attribute.String("server.address", "stuff"),
+		attribute.String("url.scheme", "http"),
+	)
+
+	// the HTTPServer version
+	expectedCurrentScopeMetric := metricdata.ScopeMetrics{
+		Scope: instrumentation.Scope{
+			Name: "test",
+		},
+		Metrics: []metricdata.Metrics{
+			{
+				Name:        "http.server.request.body.size",
+				Description: "Size of HTTP server request bodies.",
+				Unit:        "By",
+				Data: metricdata.Histogram[int64]{
+					Temporality: metricdata.CumulativeTemporality,
+					DataPoints: []metricdata.HistogramDataPoint[int64]{
+						{
+							Attributes: currAttrs,
+						},
+					},
+				},
+			},
+			{
+				Name:        "http.server.response.body.size",
+				Description: "Size of HTTP server response bodies.",
+				Unit:        "By",
+				Data: metricdata.Histogram[int64]{
+					Temporality: metricdata.CumulativeTemporality,
+					DataPoints: []metricdata.HistogramDataPoint[int64]{
+						{
+							Attributes: currAttrs,
+						},
+					},
+				},
+			},
+			{
+				Name:        "http.server.request.duration",
+				Description: "Duration of HTTP server requests.",
+				Unit:        "s",
+				Data: metricdata.Histogram[float64]{
+					Temporality: metricdata.CumulativeTemporality,
+					DataPoints: []metricdata.HistogramDataPoint[float64]{
+						{
+							Attributes: currAttrs,
+						},
+					},
+				},
+			},
+		},
+	}
+
+	// The OldHTTPServer version
+	expectedOldScopeMetric := expectedCurrentScopeMetric
+	expectedOldScopeMetric.Metrics = append(expectedOldScopeMetric.Metrics, []metricdata.Metrics{
+		{
+			Name:        "http.server.request.size",
+			Description: "Measures the size of HTTP request messages.",
+			Unit:        "By",
+			Data: metricdata.Sum[int64]{
+				Temporality: metricdata.CumulativeTemporality,
+				IsMonotonic: true,
+				DataPoints: []metricdata.DataPoint[int64]{
+					{
+						Attributes: oldAttrs,
+					},
+				},
+			},
+		},
+		{
+			Name:        "http.server.response.size",
+			Description: "Measures the size of HTTP response messages.",
+			Unit:        "By",
+			Data: metricdata.Sum[int64]{
+				Temporality: metricdata.CumulativeTemporality,
+				IsMonotonic: true,
+				DataPoints: []metricdata.DataPoint[int64]{
+					{
+						Attributes: oldAttrs,
+					},
+				},
+			},
+		},
+		{
+			Name:        "http.server.duration",
+			Description: "Measures the duration of inbound HTTP requests.",
+			Unit:        "ms",
+			Data: metricdata.Histogram[float64]{
+				Temporality: metricdata.CumulativeTemporality,
+				DataPoints: []metricdata.HistogramDataPoint[float64]{
+					{
+						Attributes: oldAttrs,
+					},
+				},
+			},
+		},
+	}...)
+
+	tests := []struct {
+		name       string
+		serverFunc func(metric.MeterProvider) semconv.HTTPServer
+		wantFunc   func(t *testing.T, rm metricdata.ResourceMetrics)
+	}{
+		{
+			name: "No Meter",
+			serverFunc: func(metric.MeterProvider) semconv.HTTPServer {
+				return semconv.NewHTTPServer(nil)
+			},
+			wantFunc: func(t *testing.T, rm metricdata.ResourceMetrics) {
+				assert.Empty(t, rm.ScopeMetrics)
+			},
+		},
+		{
+			name: "With Meter",
+			serverFunc: func(mp metric.MeterProvider) semconv.HTTPServer {
+				return semconv.NewHTTPServer(mp.Meter("test"))
+			},
+			wantFunc: func(t *testing.T, rm metricdata.ResourceMetrics) {
+				require.Len(t, rm.ScopeMetrics, 1)
+
+				// because of OldHTTPServer
+				require.Len(t, rm.ScopeMetrics[0].Metrics, 3)
+				metricdatatest.AssertEqual(t, expectedCurrentScopeMetric, rm.ScopeMetrics[0], metricdatatest.IgnoreTimestamp(), metricdatatest.IgnoreValue())
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			reader := sdkmetric.NewManualReader()
+			mp := sdkmetric.NewMeterProvider(sdkmetric.WithReader(reader))
+
+			server := tt.serverFunc(mp)
+			req, err := http.NewRequest("POST", "http://example.com", http.NoBody)
+			assert.NoError(t, err)
+
+			server.RecordMetrics(t.Context(), semconv.ServerMetricData{
+				ServerName:   "stuff",
+				ResponseSize: 200,
+				MetricAttributes: semconv.MetricAttributes{
+					Req:        req,
+					StatusCode: 301,
+					AdditionalAttributes: []attribute.KeyValue{
+						attribute.String("key", "value"),
+					},
+				},
+				MetricData: semconv.MetricData{
+					RequestSize: 100,
+					ElapsedTime: 300,
+				},
+			})
+
+			rm := metricdata.ResourceMetrics{}
+			require.NoError(t, reader.Collect(t.Context(), &rm))
+			tt.wantFunc(t, rm)
+		})
+	}
+}
+
+func TestNewTraceResponse(t *testing.T) {
+	testCases := []struct {
+		name string
+		resp semconv.ResponseTelemetry
+		want []attribute.KeyValue
+	}{
+		{
+			name: "empty",
+			resp: semconv.ResponseTelemetry{},
+			want: nil,
+		},
+		{
+			name: "no errors",
+			resp: semconv.ResponseTelemetry{
+				StatusCode: 200,
+				ReadBytes:  701,
+				WriteBytes: 802,
+			},
+			want: []attribute.KeyValue{
+				attribute.Int("http.request.body.size", 701),
+				attribute.Int("http.response.body.size", 802),
+				attribute.Int("http.response.status_code", 200),
+			},
+		},
+		{
+			name: "with errors",
+			resp: semconv.ResponseTelemetry{
+				StatusCode: 200,
+				ReadBytes:  701,
+				ReadError:  fmt.Errorf("read error"),
+				WriteBytes: 802,
+				WriteError: fmt.Errorf("write error"),
+			},
+			want: []attribute.KeyValue{
+				attribute.Int("http.request.body.size", 701),
+				attribute.Int("http.response.body.size", 802),
+				attribute.Int("http.response.status_code", 200),
+			},
+		},
+	}
+
+	for _, tt := range testCases {
+		t.Run(tt.name, func(t *testing.T) {
+			got := semconv.HTTPServer{}.ResponseTraceAttrs(tt.resp)
+			assert.ElementsMatch(t, tt.want, got)
+		})
+	}
+}
+
+func TestNewTraceRequest_Client(t *testing.T) {
+	body := strings.NewReader("Hello, world!")
+	url := "https://example.com:8888/foo/bar?stuff=morestuff"
+	req := httptest.NewRequest("pOST", url, body)
+	req.Header.Set("User-Agent", "go-test-agent")
+
+	want := []attribute.KeyValue{
+		attribute.String("http.request.method", "POST"),
+		attribute.String("http.request.method_original", "pOST"),
+		attribute.String("url.full", url),
+		attribute.String("server.address", "example.com"),
+		attribute.Int("server.port", 8888),
+		attribute.String("network.protocol.version", "1.1"),
+	}
+	client := semconv.NewHTTPClient(nil)
+	assert.ElementsMatch(t, want, client.RequestTraceAttrs(req))
+}
+
+func TestNewTraceResponse_Client(t *testing.T) {
+	testcases := []struct {
+		resp http.Response
+		want []attribute.KeyValue
+	}{
+		{resp: http.Response{StatusCode: 200, ContentLength: 123}, want: []attribute.KeyValue{attribute.Int("http.response.status_code", 200)}},
+		{resp: http.Response{StatusCode: 404, ContentLength: 0}, want: []attribute.KeyValue{attribute.Int("http.response.status_code", 404), attribute.String("error.type", "404")}},
+	}
+
+	for _, tt := range testcases {
+		client := semconv.NewHTTPClient(nil)
+		assert.ElementsMatch(t, tt.want, client.ResponseTraceAttrs(&tt.resp))
+	}
+}
+
+func TestClientRequest(t *testing.T) {
+	body := strings.NewReader("Hello, world!")
+	url := "https://example.com:8888/foo/bar?stuff=morestuff"
+	req := httptest.NewRequest("pOST", url, body)
+	req.Header.Set("User-Agent", "go-test-agent")
+
+	want := []attribute.KeyValue{
+		attribute.String("http.request.method", "POST"),
+		attribute.String("http.request.method_original", "pOST"),
+		attribute.String("url.full", url),
+		attribute.String("server.address", "example.com"),
+		attribute.Int("server.port", 8888),
+		attribute.String("network.protocol.version", "1.1"),
+	}
+	got := semconv.HTTPClient{}.RequestTraceAttrs(req)
+	assert.ElementsMatch(t, want, got)
+}
+
+func TestClientResponse(t *testing.T) {
+	testcases := []struct {
+		resp http.Response
+		want []attribute.KeyValue
+	}{
+		{resp: http.Response{StatusCode: 200, ContentLength: 123}, want: []attribute.KeyValue{attribute.Int("http.response.status_code", 200)}},
+		{resp: http.Response{StatusCode: 404, ContentLength: 0}, want: []attribute.KeyValue{attribute.Int("http.response.status_code", 404), attribute.String("error.type", "404")}},
+	}
+
+	for _, tt := range testcases {
+		got := semconv.HTTPClient{}.ResponseTraceAttrs(&tt.resp)
+		assert.ElementsMatch(t, tt.want, got)
+	}
+}
+
+func TestRequestErrorType(t *testing.T) {
+	testcases := []struct {
+		err  error
+		want attribute.KeyValue
+	}{
+		{err: errors.New("http: nil Request.URL"), want: attribute.String("error.type", "*errors.errorString")},
+		{err: customError{}, want: attribute.String("error.type", "github.com/gotenberg/gotenberg/v8/pkg/gotenberg/semconv_test.customError")},
+	}
+
+	for _, tt := range testcases {
+		got := semconv.HTTPClient{}.ErrorType(tt.err)
+		assert.Equal(t, tt.want, got)
+	}
+}
+
+func TestNewClientRecordMetrics(t *testing.T) {
+	currAttrs := attribute.NewSet(
+		attribute.String("http.request.method", "POST"),
+		attribute.Int64("http.response.status_code", 301),
+		attribute.String("network.protocol.name", "http"),
+		attribute.String("network.protocol.version", "1.1"),
+		attribute.String("server.address", "example.com"),
+		attribute.String("url.scheme", "http"),
+	)
+
+	// the HTTPClient version
+	expectedCurrentScopeMetric := metricdata.ScopeMetrics{
+		Scope: instrumentation.Scope{
+			Name: "test",
+		},
+		Metrics: []metricdata.Metrics{
+			{
+				Name:        "http.client.request.body.size",
+				Description: "Size of HTTP client request bodies.",
+				Unit:        "By",
+				Data: metricdata.Histogram[int64]{
+					Temporality: metricdata.CumulativeTemporality,
+					DataPoints: []metricdata.HistogramDataPoint[int64]{
+						{
+							Attributes: currAttrs,
+						},
+					},
+				},
+			},
+			{
+				Name:        "http.client.request.duration",
+				Description: "Duration of HTTP client requests.",
+				Unit:        "s",
+				Data: metricdata.Histogram[float64]{
+					Temporality: metricdata.CumulativeTemporality,
+					DataPoints: []metricdata.HistogramDataPoint[float64]{
+						{
+							Attributes: currAttrs,
+						},
+					},
+				},
+			},
+		},
+	}
+
+	tests := []struct {
+		name       string
+		clientFunc func(metric.MeterProvider) semconv.HTTPClient
+		wantFunc   func(t *testing.T, rm metricdata.ResourceMetrics)
+	}{
+		{
+			name: "No environment variable set, and no Meter",
+			clientFunc: func(metric.MeterProvider) semconv.HTTPClient {
+				return semconv.NewHTTPClient(nil)
+			},
+			wantFunc: func(t *testing.T, rm metricdata.ResourceMetrics) {
+				assert.Empty(t, rm.ScopeMetrics)
+			},
+		},
+		{
+			name: "With Meter",
+			clientFunc: func(mp metric.MeterProvider) semconv.HTTPClient {
+				return semconv.NewHTTPClient(mp.Meter("test"))
+			},
+			wantFunc: func(t *testing.T, rm metricdata.ResourceMetrics) {
+				require.Len(t, rm.ScopeMetrics, 1)
+
+				require.Len(t, rm.ScopeMetrics[0].Metrics, 2)
+				metricdatatest.AssertEqual(t, expectedCurrentScopeMetric, rm.ScopeMetrics[0], metricdatatest.IgnoreTimestamp(), metricdatatest.IgnoreValue())
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			reader := sdkmetric.NewManualReader()
+			mp := sdkmetric.NewMeterProvider(sdkmetric.WithReader(reader))
+
+			client := tt.clientFunc(mp)
+			req, err := http.NewRequest("POST", "http://example.com", http.NoBody)
+			assert.NoError(t, err)
+
+			client.RecordMetrics(t.Context(), semconv.MetricData{
+				RequestSize: 100,
+				ElapsedTime: 300,
+			}, client.MetricOptions(semconv.MetricAttributes{
+				Req:        req,
+				StatusCode: 301,
+			}))
+
+			rm := metricdata.ResourceMetrics{}
+			require.NoError(t, reader.Collect(t.Context(), &rm))
+			tt.wantFunc(t, rm)
+		})
+	}
+}
+
+type customError struct{}
+
+func (customError) Error() string {
+	return "custom error"
+}

pkg/gotenberg/semconv/server.go

@@ -0,0 +1,405 @@
+// Code generated by gotmpl. DO NOT MODIFY.
+// source: internal/shared/semconv/server.go.tmpl
+
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Package semconv provides OpenTelemetry semantic convention types and
+// functionality.
+package semconv // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv"
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"slices"
+	"strings"
+	"sync"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/semconv/v1.39.0"
+	"go.opentelemetry.io/otel/semconv/v1.39.0/httpconv"
+)
+
+type RequestTraceAttrsOpts struct {
+	// If set, this is used as value for the "http.client_ip" attribute.
+	HTTPClientIP string
+}
+
+type ResponseTelemetry struct {
+	StatusCode int
+	ReadBytes  int64
+	ReadError  error
+	WriteBytes int64
+	WriteError error
+}
+
+type HTTPServer struct {
+	requestBodySizeHistogram  httpconv.ServerRequestBodySize
+	responseBodySizeHistogram httpconv.ServerResponseBodySize
+	requestDurationHistogram  httpconv.ServerRequestDuration
+}
+
+func NewHTTPServer(meter metric.Meter) HTTPServer {
+	server := HTTPServer{}
+
+	var err error
+	server.requestBodySizeHistogram, err = httpconv.NewServerRequestBodySize(meter)
+	handleErr(err)
+
+	server.responseBodySizeHistogram, err = httpconv.NewServerResponseBodySize(meter)
+	handleErr(err)
+
+	server.requestDurationHistogram, err = httpconv.NewServerRequestDuration(
+		meter,
+		metric.WithExplicitBucketBoundaries(
+			0.005, 0.01, 0.025, 0.05, 0.075, 0.1,
+			0.25, 0.5, 0.75, 1, 2.5, 5, 7.5, 10,
+		),
+	)
+	handleErr(err)
+	return server
+}
+
+// Status returns a span status code and message for an HTTP status code
+// value returned by a server.
+func (n HTTPServer) Status(code int) (codes.Code, string) {
+	if code == 0 {
+		return codes.Error, "No HTTP status code"
+	}
+	if code < 100 || code >= 600 {
+		return codes.Error, fmt.Sprintf("Invalid HTTP status code %d", code)
+	}
+	if code >= 400 {
+		return codes.Error, http.StatusText(code)
+	}
+	return codes.Ok, ""
+}
+
+// RequestTraceAttrs returns trace attributes for an HTTP request received by a
+// server.
+//
+// The server must be the primary server name if it is known. For example this
+// would be the ServerName directive
+// (https://httpd.apache.org/docs/2.4/mod/core.html#servername) for an Apache
+// server, and the server_name directive
+// (http://nginx.org/en/docs/http/ngx_http_core_module.html#server_name) for an
+// nginx server. More generically, the primary server name would be the host
+// header value that matches the default virtual host of an HTTP server. It
+// should include the host identifier and if a port is used to route to the
+// server that port identifier should be included as an appropriate port
+// suffix.
+//
+// If the primary server name is not known, server should be an empty string.
+// The req Host will be used to determine the server instead.
+func (n HTTPServer) RequestTraceAttrs(server string, req *http.Request, opts RequestTraceAttrsOpts) []attribute.KeyValue {
+	count := 3 // ServerAddress, Method, Scheme
+
+	var host string
+	var p int
+	if server == "" {
+		host, p = SplitHostPort(req.Host)
+	} else {
+		// Prioritize the primary server name.
+		host, p = SplitHostPort(server)
+		if p < 0 {
+			_, p = SplitHostPort(req.Host)
+		}
+	}
+
+	hostPort := requiredHTTPPort(req.TLS != nil, p)
+	if hostPort > 0 {
+		count++
+	}
+
+	method, methodOriginal := n.method(req.Method)
+	if methodOriginal != (attribute.KeyValue{}) {
+		count++
+	}
+
+	scheme := n.scheme(req.TLS != nil)
+
+	peer, peerPort := SplitHostPort(req.RemoteAddr)
+	if peer != "" {
+		// The Go HTTP server sets RemoteAddr to "IP:port", this will not be a
+		// file-path that would be interpreted with a sock family.
+		count++
+		if peerPort > 0 {
+			count++
+		}
+	}
+
+	useragent := req.UserAgent()
+	if useragent != "" {
+		count++
+	}
+
+	// For client IP, use, in order:
+	// 1. The value passed in the options
+	// 2. The value in the X-Forwarded-For header
+	// 3. The peer address
+	clientIP := opts.HTTPClientIP
+	if clientIP == "" {
+		clientIP = serverClientIP(req.Header.Get("X-Forwarded-For"))
+		if clientIP == "" {
+			clientIP = peer
+		}
+	}
+	if clientIP != "" {
+		count++
+	}
+
+	if req.URL != nil && req.URL.Path != "" {
+		count++
+	}
+
+	protoName, protoVersion := netProtocol(req.Proto)
+	if protoName != "" && protoName != "http" {
+		count++
+	}
+	if protoVersion != "" {
+		count++
+	}
+
+	route := httpRoute(req.Pattern)
+	if route != "" {
+		count++
+	}
+
+	attrs := make([]attribute.KeyValue, 0, count)
+	attrs = append(attrs,
+		semconv.ServerAddress(host),
+		method,
+		scheme,
+	)
+
+	if hostPort > 0 {
+		attrs = append(attrs, semconv.ServerPort(hostPort))
+	}
+	if methodOriginal != (attribute.KeyValue{}) {
+		attrs = append(attrs, methodOriginal)
+	}
+
+	if peer, peerPort := SplitHostPort(req.RemoteAddr); peer != "" {
+		// The Go HTTP server sets RemoteAddr to "IP:port", this will not be a
+		// file-path that would be interpreted with a sock family.
+		attrs = append(attrs, semconv.NetworkPeerAddress(peer))
+		if peerPort > 0 {
+			attrs = append(attrs, semconv.NetworkPeerPort(peerPort))
+		}
+	}
+
+	if useragent != "" {
+		attrs = append(attrs, semconv.UserAgentOriginal(useragent))
+	}
+
+	if clientIP != "" {
+		attrs = append(attrs, semconv.ClientAddress(clientIP))
+	}
+
+	if req.URL != nil && req.URL.Path != "" {
+		attrs = append(attrs, semconv.URLPath(req.URL.Path))
+	}
+
+	if protoName != "" && protoName != "http" {
+		attrs = append(attrs, semconv.NetworkProtocolName(protoName))
+	}
+	if protoVersion != "" {
+		attrs = append(attrs, semconv.NetworkProtocolVersion(protoVersion))
+	}
+
+	if route != "" {
+		attrs = append(attrs, n.Route(route))
+	}
+
+	return attrs
+}
+
+func (s HTTPServer) NetworkTransportAttr(network string) []attribute.KeyValue {
+	attr := semconv.NetworkTransportPipe
+	switch network {
+	case "tcp", "tcp4", "tcp6":
+		attr = semconv.NetworkTransportTCP
+	case "udp", "udp4", "udp6":
+		attr = semconv.NetworkTransportUDP
+	case "unix", "unixgram", "unixpacket":
+		attr = semconv.NetworkTransportUnix
+	}
+
+	return []attribute.KeyValue{attr}
+}
+
+type ServerMetricData struct {
+	ServerName   string
+	ResponseSize int64
+
+	MetricData
+	MetricAttributes
+}
+
+type MetricAttributes struct {
+	Req                  *http.Request
+	StatusCode           int
+	Route                string
+	AdditionalAttributes []attribute.KeyValue
+}
+
+type MetricData struct {
+	RequestSize int64
+
+	// The request duration, in milliseconds
+	ElapsedTime float64
+}
+
+var (
+	metricAddOptionPool = &sync.Pool{
+		New: func() any {
+			return &[]metric.AddOption{}
+		},
+	}
+
+	metricRecordOptionPool = &sync.Pool{
+		New: func() any {
+			return &[]metric.RecordOption{}
+		},
+	}
+)
+
+func (n HTTPServer) RecordMetrics(ctx context.Context, md ServerMetricData) {
+	attributes := n.MetricAttributes(md.ServerName, md.Req, md.StatusCode, md.Route, md.AdditionalAttributes)
+	o := metric.WithAttributeSet(attribute.NewSet(attributes...))
+	recordOpts := metricRecordOptionPool.Get().(*[]metric.RecordOption)
+	*recordOpts = append(*recordOpts, o)
+	n.requestBodySizeHistogram.Inst().Record(ctx, md.RequestSize, *recordOpts...)
+	n.responseBodySizeHistogram.Inst().Record(ctx, md.ResponseSize, *recordOpts...)
+	n.requestDurationHistogram.Inst().Record(ctx, md.ElapsedTime/1000.0, o)
+	*recordOpts = (*recordOpts)[:0]
+	metricRecordOptionPool.Put(recordOpts)
+}
+
+func (n HTTPServer) method(method string) (attribute.KeyValue, attribute.KeyValue) {
+	if method == "" {
+		return semconv.HTTPRequestMethodGet, attribute.KeyValue{}
+	}
+	if attr, ok := methodLookup[method]; ok {
+		return attr, attribute.KeyValue{}
+	}
+
+	orig := semconv.HTTPRequestMethodOriginal(method)
+	if attr, ok := methodLookup[strings.ToUpper(method)]; ok {
+		return attr, orig
+	}
+	return semconv.HTTPRequestMethodGet, orig
+}
+
+func (n HTTPServer) scheme(https bool) attribute.KeyValue { //nolint:revive // ignore linter
+	if https {
+		return semconv.URLScheme("https")
+	}
+	return semconv.URLScheme("http")
+}
+
+// ResponseTraceAttrs returns trace attributes for telemetry from an HTTP
+// response.
+//
+// If any of the fields in the ResponseTelemetry are not set the attribute will
+// be omitted.
+func (n HTTPServer) ResponseTraceAttrs(resp ResponseTelemetry) []attribute.KeyValue {
+	var count int
+
+	if resp.ReadBytes > 0 {
+		count++
+	}
+	if resp.WriteBytes > 0 {
+		count++
+	}
+	if resp.StatusCode > 0 {
+		count++
+	}
+
+	attributes := make([]attribute.KeyValue, 0, count)
+
+	if resp.ReadBytes > 0 {
+		attributes = append(attributes,
+			semconv.HTTPRequestBodySize(int(resp.ReadBytes)),
+		)
+	}
+	if resp.WriteBytes > 0 {
+		attributes = append(attributes,
+			semconv.HTTPResponseBodySize(int(resp.WriteBytes)),
+		)
+	}
+	if resp.StatusCode > 0 {
+		attributes = append(attributes,
+			semconv.HTTPResponseStatusCode(resp.StatusCode),
+		)
+	}
+
+	return attributes
+}
+
+// Route returns the attribute for the route.
+func (n HTTPServer) Route(route string) attribute.KeyValue {
+	return semconv.HTTPRoute(route)
+}
+
+func (n HTTPServer) MetricAttributes(server string, req *http.Request, statusCode int, route string, additionalAttributes []attribute.KeyValue) []attribute.KeyValue {
+	num := len(additionalAttributes) + 3
+	var host string
+	var p int
+	if server == "" {
+		host, p = SplitHostPort(req.Host)
+	} else {
+		// Prioritize the primary server name.
+		host, p = SplitHostPort(server)
+		if p < 0 {
+			_, p = SplitHostPort(req.Host)
+		}
+	}
+	hostPort := requiredHTTPPort(req.TLS != nil, p)
+	if hostPort > 0 {
+		num++
+	}
+	protoName, protoVersion := netProtocol(req.Proto)
+	if protoName != "" {
+		num++
+	}
+	if protoVersion != "" {
+		num++
+	}
+
+	if statusCode > 0 {
+		num++
+	}
+
+	if route != "" {
+		num++
+	}
+
+	attributes := slices.Grow(additionalAttributes, num)
+	attributes = append(attributes,
+		semconv.HTTPRequestMethodKey.String(standardizeHTTPMethod(req.Method)),
+		n.scheme(req.TLS != nil),
+		semconv.ServerAddress(host))
+
+	if hostPort > 0 {
+		attributes = append(attributes, semconv.ServerPort(hostPort))
+	}
+	if protoName != "" {
+		attributes = append(attributes, semconv.NetworkProtocolName(protoName))
+	}
+	if protoVersion != "" {
+		attributes = append(attributes, semconv.NetworkProtocolVersion(protoVersion))
+	}
+
+	if statusCode > 0 {
+		attributes = append(attributes, semconv.HTTPResponseStatusCode(statusCode))
+	}
+
+	if route != "" {
+		attributes = append(attributes, semconv.HTTPRoute(route))
+	}
+	return attributes
+}

pkg/gotenberg/semconv/server_test.go

@@ -0,0 +1,210 @@
+// Code generated by gotmpl. DO NOT MODIFY.
+// source: internal/shared/semconv/server_test.go.tmpl
+
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package semconv
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"go.opentelemetry.io/otel/attribute"
+)
+
+func TestHTTPServer_MetricAttributes(t *testing.T) {
+	defaultRequest, err := http.NewRequest("GET", "http://example.com/path?query=test", http.NoBody)
+	require.NoError(t, err)
+
+	tests := []struct {
+		name                 string
+		server               string
+		req                  *http.Request
+		statusCode           int
+		route                string
+		additionalAttributes []attribute.KeyValue
+		wantFunc             func(t *testing.T, attrs []attribute.KeyValue)
+	}{
+		{
+			name:                 "routine testing",
+			server:               "",
+			req:                  defaultRequest,
+			statusCode:           200,
+			route:                "",
+			additionalAttributes: []attribute.KeyValue{attribute.String("test", "test")},
+			wantFunc: func(t *testing.T, attrs []attribute.KeyValue) {
+				require.Len(t, attrs, 7)
+				assert.ElementsMatch(t, []attribute.KeyValue{
+					attribute.String("http.request.method", "GET"),
+					attribute.String("url.scheme", "http"),
+					attribute.String("server.address", "example.com"),
+					attribute.String("network.protocol.name", "http"),
+					attribute.String("network.protocol.version", "1.1"),
+					attribute.Int64("http.response.status_code", 200),
+					attribute.String("test", "test"),
+				}, attrs)
+			},
+		},
+		{
+			name:                 "use server address",
+			server:               "example.com:9999",
+			req:                  defaultRequest,
+			statusCode:           200,
+			route:                "/path/${id}",
+			additionalAttributes: nil,
+			wantFunc: func(t *testing.T, attrs []attribute.KeyValue) {
+				require.Len(t, attrs, 8)
+				assert.ElementsMatch(t, []attribute.KeyValue{
+					attribute.String("http.request.method", "GET"),
+					attribute.String("url.scheme", "http"),
+					attribute.String("server.address", "example.com"),
+					attribute.Int("server.port", 9999),
+					attribute.String("network.protocol.name", "http"),
+					attribute.String("network.protocol.version", "1.1"),
+					attribute.Int64("http.response.status_code", 200),
+					attribute.String("http.route", "/path/${id}"),
+				}, attrs)
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := HTTPServer{}.MetricAttributes(tt.server, tt.req, tt.statusCode, tt.route, tt.additionalAttributes)
+			tt.wantFunc(t, got)
+		})
+	}
+}
+
+func TestNewMethod(t *testing.T) {
+	testCases := []struct {
+		method   string
+		n        int
+		want     attribute.KeyValue
+		wantOrig attribute.KeyValue
+	}{
+		{
+			method: http.MethodPost,
+			n:      1,
+			want:   attribute.String("http.request.method", "POST"),
+		},
+		{
+			method:   "Put",
+			n:        2,
+			want:     attribute.String("http.request.method", "PUT"),
+			wantOrig: attribute.String("http.request.method_original", "Put"),
+		},
+		{
+			method:   "Unknown",
+			n:        2,
+			want:     attribute.String("http.request.method", "GET"),
+			wantOrig: attribute.String("http.request.method_original", "Unknown"),
+		},
+	}
+
+	for _, tt := range testCases {
+		t.Run(tt.method, func(t *testing.T) {
+			got, gotOrig := HTTPServer{}.method(tt.method)
+			assert.Equal(t, tt.want, got)
+			assert.Equal(t, tt.wantOrig, gotOrig)
+		})
+	}
+}
+
+func TestRequestTraceAttrs_HTTPRoute(t *testing.T) {
+	tests := []struct {
+		name      string
+		pattern   string
+		wantRoute string
+	}{
+		{
+			name:      "only path",
+			pattern:   "/path/{id}",
+			wantRoute: "/path/{id}",
+		},
+		{
+			name:      "with method",
+			pattern:   "GET /path/{id}",
+			wantRoute: "/path/{id}",
+		},
+		{
+			name:      "with domain",
+			pattern:   "example.com/path/{id}",
+			wantRoute: "/path/{id}",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodGet, "/path/abc123", http.NoBody)
+			req.Pattern = tt.pattern
+
+			attrs := (HTTPServer{}).RequestTraceAttrs("", req, RequestTraceAttrsOpts{})
+
+			var gotRoute string
+			for _, attr := range attrs {
+				if attr.Key == "http.route" {
+					gotRoute = attr.Value.AsString()
+					break
+				}
+			}
+			require.Equal(t, tt.wantRoute, gotRoute)
+		})
+	}
+}
+
+func TestRequestTraceAttrs_ClientIP(t *testing.T) {
+	for _, tt := range []struct {
+		name              string
+		requestModifierFn func(r *http.Request)
+		requestTraceOpts  RequestTraceAttrsOpts
+
+		wantClientIP string
+	}{
+		{
+			name:         "with a client IP from the network",
+			wantClientIP: "1.2.3.4",
+		},
+		{
+			name: "with a client IP from x-forwarded-for header",
+			requestModifierFn: func(r *http.Request) {
+				r.Header.Add("X-Forwarded-For", "5.6.7.8")
+			},
+			wantClientIP: "5.6.7.8",
+		},
+		{
+			name: "with a client IP in options",
+			requestModifierFn: func(r *http.Request) {
+				r.Header.Add("X-Forwarded-For", "5.6.7.8")
+			},
+			requestTraceOpts: RequestTraceAttrsOpts{
+				HTTPClientIP: "9.8.7.6",
+			},
+			wantClientIP: "9.8.7.6",
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodGet, "/example", http.NoBody)
+			req.RemoteAddr = "1.2.3.4:5678"
+
+			if tt.requestModifierFn != nil {
+				tt.requestModifierFn(req)
+			}
+
+			var found bool
+			for _, attr := range (HTTPServer{}).RequestTraceAttrs("", req, tt.requestTraceOpts) {
+				if attr.Key != "client.address" {
+					continue
+				}
+				found = true
+				assert.Equal(t, tt.wantClientIP, attr.Value.AsString())
+			}
+			require.True(t, found)
+		})
+	}
+}

pkg/gotenberg/semconv/util.go

@@ -0,0 +1,127 @@
+// Code generated by gotmpl. DO NOT MODIFY.
+// source: internal/shared/semconv/util.go.tmpl
+
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package semconv // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv"
+
+import (
+	"net"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	semconvNew "go.opentelemetry.io/otel/semconv/v1.39.0"
+)
+
+// SplitHostPort splits a network address hostport of the form "host",
+// "host%zone", "[host]", "[host%zone], "host:port", "host%zone:port",
+// "[host]:port", "[host%zone]:port", or ":port" into host or host%zone and
+// port.
+//
+// An empty host is returned if it is not provided or unparsable. A negative
+// port is returned if it is not provided or unparsable.
+func SplitHostPort(hostport string) (host string, port int) {
+	port = -1
+
+	if strings.HasPrefix(hostport, "[") {
+		addrEnd := strings.LastIndexByte(hostport, ']')
+		if addrEnd < 0 {
+			// Invalid hostport.
+			return
+		}
+		if i := strings.LastIndexByte(hostport[addrEnd:], ':'); i < 0 {
+			host = hostport[1:addrEnd]
+			return
+		}
+	} else {
+		if i := strings.LastIndexByte(hostport, ':'); i < 0 {
+			host = hostport
+			return
+		}
+	}
+
+	host, pStr, err := net.SplitHostPort(hostport)
+	if err != nil {
+		return
+	}
+
+	p, err := strconv.ParseUint(pStr, 10, 16)
+	if err != nil {
+		return
+	}
+	return host, int(p) //nolint:gosec  // Byte size checked 16 above.
+}
+
+func requiredHTTPPort(https bool, port int) int { //nolint:revive // ignore linter
+	if https {
+		if port > 0 && port != 443 {
+			return port
+		}
+	} else {
+		if port > 0 && port != 80 {
+			return port
+		}
+	}
+	return -1
+}
+
+func serverClientIP(xForwardedFor string) string {
+	if idx := strings.IndexByte(xForwardedFor, ','); idx >= 0 {
+		xForwardedFor = xForwardedFor[:idx]
+	}
+	return xForwardedFor
+}
+
+func httpRoute(pattern string) string {
+	if idx := strings.IndexByte(pattern, '/'); idx >= 0 {
+		return pattern[idx:]
+	}
+	return ""
+}
+
+func netProtocol(proto string) (name string, version string) {
+	name, version, _ = strings.Cut(proto, "/")
+	switch name {
+	case "HTTP":
+		name = "http"
+	case "QUIC":
+		name = "quic"
+	case "SPDY":
+		name = "spdy"
+	default:
+		name = strings.ToLower(name)
+	}
+	return name, version
+}
+
+var methodLookup = map[string]attribute.KeyValue{
+	http.MethodConnect: semconvNew.HTTPRequestMethodConnect,
+	http.MethodDelete:  semconvNew.HTTPRequestMethodDelete,
+	http.MethodGet:     semconvNew.HTTPRequestMethodGet,
+	http.MethodHead:    semconvNew.HTTPRequestMethodHead,
+	http.MethodOptions: semconvNew.HTTPRequestMethodOptions,
+	http.MethodPatch:   semconvNew.HTTPRequestMethodPatch,
+	http.MethodPost:    semconvNew.HTTPRequestMethodPost,
+	http.MethodPut:     semconvNew.HTTPRequestMethodPut,
+	http.MethodTrace:   semconvNew.HTTPRequestMethodTrace,
+}
+
+func handleErr(err error) {
+	if err != nil {
+		otel.Handle(err)
+	}
+}
+
+func standardizeHTTPMethod(method string) string {
+	method = strings.ToUpper(method)
+	switch method {
+	case http.MethodConnect, http.MethodDelete, http.MethodGet, http.MethodHead, http.MethodOptions, http.MethodPatch, http.MethodPost, http.MethodPut, http.MethodTrace:
+	default:
+		method = "_OTHER"
+	}
+	return method
+}

pkg/gotenberg/semconv/util_test.go

@@ -0,0 +1,75 @@
+// Code generated by gotmpl. DO NOT MODIFY.
+// source: internal/shared/semconv/util_test.go.tmpl
+
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package semconv
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestSplitHostPort(t *testing.T) {
+	tests := []struct {
+		hostport string
+		host     string
+		port     int
+	}{
+		{"", "", -1},
+		{":8080", "", 8080},
+		{"127.0.0.1", "127.0.0.1", -1},
+		{"www.example.com", "www.example.com", -1},
+		{"127.0.0.1%25en0", "127.0.0.1%25en0", -1},
+		{"[]", "", -1}, // Ensure this doesn't panic.
+		{"[fe80::1", "", -1},
+		{"[fe80::1]", "fe80::1", -1},
+		{"[fe80::1%25en0]", "fe80::1%25en0", -1},
+		{"[fe80::1]:8080", "fe80::1", 8080},
+		{"[fe80::1]::", "", -1}, // Too many colons.
+		{"127.0.0.1:", "127.0.0.1", -1},
+		{"127.0.0.1:port", "127.0.0.1", -1},
+		{"127.0.0.1:8080", "127.0.0.1", 8080},
+		{"www.example.com:8080", "www.example.com", 8080},
+		{"127.0.0.1%25en0:8080", "127.0.0.1%25en0", 8080},
+	}
+
+	for _, test := range tests {
+		h, p := SplitHostPort(test.hostport)
+		assert.Equal(t, test.host, h, test.hostport)
+		assert.Equal(t, test.port, p, test.hostport)
+	}
+}
+
+func TestStandardizeHTTPMethod(t *testing.T) {
+	tests := []struct {
+		method string
+		want   string
+	}{
+		{"GET", "GET"},
+		{"get", "GET"},
+		{"POST", "POST"},
+		{"post", "POST"},
+		{"PUT", "PUT"},
+		{"put", "PUT"},
+		{"DELETE", "DELETE"},
+		{"delete", "DELETE"},
+		{"HEAD", "HEAD"},
+		{"head", "HEAD"},
+		{"OPTIONS", "OPTIONS"},
+		{"options", "OPTIONS"},
+		{"CONNECT", "CONNECT"},
+		{"connect", "CONNECT"},
+		{"TRACE", "TRACE"},
+		{"trace", "TRACE"},
+		{"PATCH", "PATCH"},
+		{"patch", "PATCH"},
+		{"unknown", "_OTHER"},
+		{"", "_OTHER"},
+	}
+	for _, test := range tests {
+		assert.Equal(t, test.want, standardizeHTTPMethod(test.method))
+	}
+}

pkg/gotenberg/supervisor.go

@@ -4,10 +4,9 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"sync"
 	"sync/atomic"
-
-	"go.uber.org/zap"
 )
 
 // ErrProcessAlreadyRestarting happens if the [ProcessSupervisor] is trying
@@ -27,15 +26,15 @@ var ErrMaximumQueueSizeExceeded = errors.New("maximum queue size exceeded")
 type Process interface {
 	// Start initiates the process and returns an error if the process cannot
 	// be started.
-	Start(logger *zap.Logger) error
+	Start(logger *slog.Logger) error
 
 	// Stop terminates the process and returns an error if the process cannot
 	// be stopped.
-	Stop(logger *zap.Logger) error
+	Stop(logger *slog.Logger) error
 
 	// Healthy checks the health of the process. It returns true if the process
 	// is healthy; otherwise, it returns false.
-	Healthy(logger *zap.Logger) bool
+	Healthy(logger *slog.Logger) bool
 }
 
 // ProcessSupervisor provides methods to manage a [Process], including
@@ -66,17 +65,20 @@ type ProcessSupervisor interface {
 	//
 	// It returns an error if the task cannot be run or if the process state
 	// cannot be managed properly.
-	Run(ctx context.Context, logger *zap.Logger, task func() error) error
+	Run(ctx context.Context, logger *slog.Logger, task func() error) error
 
 	// ReqQueueSize returns the current size of the request queue.
 	ReqQueueSize() int64
 
+	// ActiveTasksCount returns the current number of active tasks.
+	ActiveTasksCount() int64
+
 	// RestartsCount returns the current number of restart.
 	RestartsCount() int64
 }
 
 type processSupervisor struct {
-	logger          *zap.Logger
+	logger          *slog.Logger
 	process         Process
 	maxReqLimit     int64
 	maxQueueSize    int64
@@ -94,7 +96,7 @@ type processSupervisor struct {
 }
 
 // NewProcessSupervisor initializes a new [ProcessSupervisor].
-func NewProcessSupervisor(logger *zap.Logger, process Process, maxReqLimit, maxQueueSize, maxConcurrency int64) ProcessSupervisor {
+func NewProcessSupervisor(logger *slog.Logger, process Process, maxReqLimit, maxQueueSize, maxConcurrency int64) ProcessSupervisor {
 	if maxConcurrency < 1 {
 		maxConcurrency = 1
 	}
@@ -117,37 +119,37 @@ func NewProcessSupervisor(logger *zap.Logger, process Process, maxReqLimit, maxQ
 }
 
 func (s *processSupervisor) Launch() error {
-	s.logger.Debug("start process")
+	s.logger.DebugContext(context.Background(), "start process")
 	err := s.process.Start(s.logger)
 	if err != nil {
 		return fmt.Errorf("start process: %w", err)
 	}
 
 	s.firstStart.Store(true)
-	s.logger.Debug("process successfully started")
+	s.logger.DebugContext(context.Background(), "process successfully started")
 
 	return nil
 }
 
 func (s *processSupervisor) Shutdown() error {
-	s.logger.Debug("shutdown process")
+	s.logger.DebugContext(context.Background(), "shutdown process")
 	err := s.process.Stop(s.logger)
 	if err != nil {
 		return fmt.Errorf("shutdown process: %w", err)
 	}
 
-	s.logger.Debug("process successfully shutdown")
+	s.logger.DebugContext(context.Background(), "process successfully shutdown")
 
 	return nil
 }
 
 func (s *processSupervisor) restart() error {
-	s.logger.Debug("restart process")
+	s.logger.DebugContext(context.Background(), "restart process")
 
 	err := s.Shutdown()
 	if err != nil {
 		// No big deal? Chances are it's already stopped.
-		s.logger.Debug(fmt.Sprintf("stop process before restart: %s", err))
+		s.logger.DebugContext(context.Background(), fmt.Sprintf("stop process before restart: %s", err))
 	}
 
 	err = s.Launch()
@@ -157,7 +159,7 @@ func (s *processSupervisor) restart() error {
 
 	s.reqCounter.Store(0)
 	s.restartsCounter.Add(1)
-	s.logger.Debug("process successfully restarted")
+	s.logger.DebugContext(context.Background(), "process successfully restarted")
 
 	return nil
 }
@@ -176,7 +178,7 @@ func (s *processSupervisor) Healthy() bool {
 	return s.process.Healthy(s.logger)
 }
 
-func (s *processSupervisor) Run(ctx context.Context, logger *zap.Logger, task func() error) error {
+func (s *processSupervisor) Run(ctx context.Context, logger *slog.Logger, task func() error) error {
 	// A user reported a potential issue:
 	//
 	// "Although the counting operation is atomic, nothing prevent 2 concurrent
@@ -202,7 +204,7 @@ func (s *processSupervisor) Run(ctx context.Context, logger *zap.Logger, task fu
 		err := func() error {
 			select {
 			case s.semaphore <- struct{}{}:
-				logger.Debug("process lock acquired")
+				logger.DebugContext(ctx, "process lock acquired")
 
 				// If a restart drain is in progress, release the slot
 				// immediately so the drain can acquire it instead.
@@ -219,7 +221,7 @@ func (s *processSupervisor) Run(ctx context.Context, logger *zap.Logger, task fu
 				defer func() {
 					s.activeTasks.Add(-1)
 					if releaseSemaphore {
-						logger.Debug("process lock released")
+						logger.DebugContext(ctx, "process lock released")
 						<-s.semaphore
 					}
 				}()
@@ -236,7 +238,7 @@ func (s *processSupervisor) Run(ctx context.Context, logger *zap.Logger, task fu
 				}
 
 				if !s.Healthy() {
-					s.logger.Debug("process is unhealthy, cannot handle task, restarting...")
+					s.logger.DebugContext(ctx, "process is unhealthy, cannot handle task, restarting...")
 					err := s.doRestart(ctx)
 					if err != nil {
 						return fmt.Errorf("process restart before task: %w", err)
@@ -248,16 +250,16 @@ func (s *processSupervisor) Run(ctx context.Context, logger *zap.Logger, task fu
 				if s.maxReqLimit > 0 && s.reqCounter.Load() >= s.maxReqLimit {
 					// Only one goroutine should trigger the restart.
 					if s.restartMutex.TryLock() {
-						s.logger.Debug("max request limit reached, restarting eagerly...")
+						s.logger.DebugContext(ctx, "max request limit reached, restarting eagerly...")
 						releaseSemaphore = false
 
 						go func() {
 							restartErr := s.doRestartLocked(context.Background())
 							s.restartMutex.Unlock()
 							if restartErr != nil {
-								s.logger.Error(fmt.Sprintf("process restart after task: %v", restartErr))
+								s.logger.ErrorContext(context.Background(), fmt.Sprintf("process restart after task: %v", restartErr))
 							}
-							logger.Debug("process lock released")
+							logger.DebugContext(context.Background(), "process lock released")
 							<-s.semaphore
 						}()
 					}
@@ -266,7 +268,7 @@ func (s *processSupervisor) Run(ctx context.Context, logger *zap.Logger, task fu
 				// Note: no error wrapping because it leaks on Chromium console exceptions output.
 				return err
 			case <-ctx.Done():
-				logger.Debug("failed to acquire process lock before deadline")
+				logger.DebugContext(ctx, "failed to acquire process lock before deadline")
 				s.reqQueueSize.Add(-1)
 
 				return fmt.Errorf("acquire process lock: %w", ctx.Err())
@@ -274,7 +276,7 @@ func (s *processSupervisor) Run(ctx context.Context, logger *zap.Logger, task fu
 		}()
 
 		if errors.Is(err, ErrProcessAlreadyRestarting) {
-			logger.Debug("process is already restarting, trying to acquire process lock again...")
+			logger.DebugContext(ctx, "process is already restarting, trying to acquire process lock again...")
 			continue
 		}
 
@@ -344,6 +346,10 @@ func (s *processSupervisor) ReqQueueSize() int64 {
 	return s.reqQueueSize.Load()
 }
 
+func (s *processSupervisor) ActiveTasksCount() int64 {
+	return s.activeTasks.Load()
+}
+
 func (s *processSupervisor) RestartsCount() int64 {
 	return s.restartsCounter.Load()
 }

pkg/gotenberg/supervisor_test.go

@@ -3,12 +3,12 @@ package gotenberg
 import (
 	"context"
 	"errors"
+	"log/slog"
+	"os"
 	"sync"
 	"sync/atomic"
 	"testing"
 	"time"
-
-	"go.uber.org/zap"
 )
 
 func TestProcessSupervisor_Launch(t *testing.T) {
@@ -38,10 +38,10 @@ func TestProcessSupervisor_Launch(t *testing.T) {
 		},
 	} {
 		t.Run(tc.scenario, func(t *testing.T) {
-			logger := zap.NewNop()
+			logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 
 			process := &ProcessMock{
-				StartMock: func(logger *zap.Logger) error {
+				StartMock: func(logger *slog.Logger) error {
 					return tc.startError
 				},
 			}
@@ -86,10 +86,10 @@ func TestProcessSupervisor_Shutdown(t *testing.T) {
 		},
 	} {
 		t.Run(tc.scenario, func(t *testing.T) {
-			logger := zap.NewNop()
+			logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 
 			process := &ProcessMock{
-				StopMock: func(logger *zap.Logger) error {
+				StopMock: func(logger *slog.Logger) error {
 					return tc.stopError
 				},
 			}
@@ -135,13 +135,13 @@ func TestProcessSupervisor_restart(t *testing.T) {
 		},
 	} {
 		t.Run(tc.scenario, func(t *testing.T) {
-			logger := zap.NewNop()
+			logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 
 			process := &ProcessMock{
-				StartMock: func(logger *zap.Logger) error {
+				StartMock: func(logger *slog.Logger) error {
 					return tc.startError
 				},
-				StopMock: func(logger *zap.Logger) error {
+				StopMock: func(logger *slog.Logger) error {
 					return tc.stopError
 				},
 			}
@@ -194,10 +194,10 @@ func TestProcessSupervisor_Healthy(t *testing.T) {
 		},
 	} {
 		t.Run(tc.scenario, func(t *testing.T) {
-			logger := zap.NewNop()
+			logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 
 			process := &ProcessMock{
-				HealthyMock: func(logger *zap.Logger) bool {
+				HealthyMock: func(logger *slog.Logger) bool {
 					return tc.processHealthy
 				},
 			}
@@ -365,7 +365,7 @@ func TestProcessSupervisor_Run(t *testing.T) {
 		},
 	} {
 		t.Run(tc.scenario, func(t *testing.T) {
-			logger := zap.NewNop()
+			logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 
 			var startCalls, healthyCalls, stopCalls atomic.Int64
 			startCalls.Store(0)
@@ -373,15 +373,15 @@ func TestProcessSupervisor_Run(t *testing.T) {
 			stopCalls.Store(0)
 
 			process := &ProcessMock{
-				StartMock: func(logger *zap.Logger) error {
+				StartMock: func(logger *slog.Logger) error {
 					startCalls.Add(1)
 					return tc.startError
 				},
-				StopMock: func(logger *zap.Logger) error {
+				StopMock: func(logger *slog.Logger) error {
 					stopCalls.Add(1)
 					return nil
 				},
-				HealthyMock: func(logger *zap.Logger) bool {
+				HealthyMock: func(logger *slog.Logger) bool {
 					healthyCalls.Add(1)
 					return tc.processHealthy
 				},
@@ -471,7 +471,7 @@ func TestProcessSupervisor_runWithDeadline(t *testing.T) {
 		},
 	} {
 		t.Run(tc.scenario, func(t *testing.T) {
-			ps := NewProcessSupervisor(zap.NewNop(), new(ProcessMock), 0, 0, 1).(*processSupervisor)
+			ps := NewProcessSupervisor(slog.New(slog.NewJSONHandler(os.Stdout, nil)), new(ProcessMock), 0, 0, 1).(*processSupervisor)
 
 			ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
 			if tc.ctxDone {
@@ -496,12 +496,12 @@ func TestProcessSupervisor_runWithDeadline(t *testing.T) {
 }
 
 func TestProcessSupervisor_ReqQueueSize(t *testing.T) {
-	logger := zap.NewNop()
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 	process := &ProcessMock{
-		StartMock: func(logger *zap.Logger) error {
+		StartMock: func(logger *slog.Logger) error {
 			return nil
 		},
-		HealthyMock: func(logger *zap.Logger) bool {
+		HealthyMock: func(logger *slog.Logger) bool {
 			return true
 		},
 	}
@@ -593,13 +593,13 @@ func TestProcessSupervisor_RestartsCount(t *testing.T) {
 		},
 	} {
 		t.Run(tc.scenario, func(t *testing.T) {
-			logger := zap.NewNop()
+			logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 
 			process := &ProcessMock{
-				StartMock: func(logger *zap.Logger) error {
+				StartMock: func(logger *slog.Logger) error {
 					return tc.startError
 				},
-				StopMock: func(logger *zap.Logger) error {
+				StopMock: func(logger *slog.Logger) error {
 					return tc.stopError
 				},
 			}
@@ -620,18 +620,18 @@ func TestProcessSupervisor_RestartsCount(t *testing.T) {
 }
 
 func TestProcessSupervisor_ConcurrentRun(t *testing.T) {
-	logger := zap.NewNop()
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 
 	var startCalls atomic.Int64
 	process := &ProcessMock{
-		StartMock: func(logger *zap.Logger) error {
+		StartMock: func(logger *slog.Logger) error {
 			startCalls.Add(1)
 			return nil
 		},
-		StopMock: func(logger *zap.Logger) error {
+		StopMock: func(logger *slog.Logger) error {
 			return nil
 		},
-		HealthyMock: func(logger *zap.Logger) bool {
+		HealthyMock: func(logger *slog.Logger) bool {
 			return true
 		},
 	}
@@ -684,16 +684,16 @@ func TestProcessSupervisor_ConcurrentRun(t *testing.T) {
 }
 
 func TestProcessSupervisor_RestartDrainsAllSlots(t *testing.T) {
-	logger := zap.NewNop()
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 
 	process := &ProcessMock{
-		StartMock: func(logger *zap.Logger) error {
+		StartMock: func(logger *slog.Logger) error {
 			return nil
 		},
-		StopMock: func(logger *zap.Logger) error {
+		StopMock: func(logger *slog.Logger) error {
 			return nil
 		},
-		HealthyMock: func(logger *zap.Logger) bool {
+		HealthyMock: func(logger *slog.Logger) bool {
 			return true
 		},
 	}

pkg/gotenberg/telemetry.go

@@ -0,0 +1,238 @@
+package gotenberg
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"sync"
+
+	"github.com/hashicorp/go-retryablehttp"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/trace"
+	"go.uber.org/multierr"
+
+	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg/internal/log"
+	internalotel "github.com/gotenberg/gotenberg/v8/pkg/gotenberg/internal/otel"
+)
+
+const (
+	AutoLoggingFormat = "auto"
+	JsonLoggingFormat = "json"
+	TextLoggingFormat = "text"
+)
+
+const (
+	ErrorLoggingLevel = "error"
+	WarnLoggingLevel  = "warn"
+	InfoLoggingLevel  = "info"
+	DebugLoggingLevel = "debug"
+)
+
+// TelemetryConfig gathers the configuration data for Gotenberg's telemetry.
+type TelemetryConfig struct {
+	ServiceName    string
+	ServiceVersion string
+
+	LogLevel              string
+	LogFieldsPrefix       string
+	LogStdFormat          string
+	LogStdEnableGcpFields bool
+}
+
+func (cfg TelemetryConfig) slogLevel() slog.Level {
+	var level slog.Level
+	err := level.UnmarshalText([]byte(cfg.LogLevel))
+	if err != nil {
+		return slog.LevelInfo
+	}
+	return level
+}
+
+// Validate validates the telemetry configuration.
+func (cfg TelemetryConfig) Validate() error {
+	var err error
+
+	if cfg.ServiceName == "" {
+		err = multierr.Append(err,
+			errors.New("service name must not be empty"),
+		)
+	}
+
+	if cfg.ServiceVersion == "" {
+		err = multierr.Append(err,
+			errors.New("service version must not be empty"),
+		)
+	}
+
+	switch cfg.LogLevel {
+	case ErrorLoggingLevel, WarnLoggingLevel, InfoLoggingLevel, DebugLoggingLevel:
+		break
+	default:
+		err = multierr.Append(
+			err,
+			fmt.Errorf("log level must be either %s, %s, %s or %s", ErrorLoggingLevel, WarnLoggingLevel, InfoLoggingLevel, DebugLoggingLevel),
+		)
+	}
+
+	switch cfg.LogStdFormat {
+	case AutoLoggingFormat, JsonLoggingFormat, TextLoggingFormat:
+		break
+	default:
+		err = multierr.Append(
+			err,
+			fmt.Errorf("standard log format must be either %s, %s or %s", AutoLoggingFormat, JsonLoggingFormat, TextLoggingFormat),
+		)
+	}
+
+	return err
+}
+
+// StartTelemetry starts the telemetry utilities.
+func StartTelemetry(cfg TelemetryConfig) (shutdown func(context.Context) error, err error) {
+	var handlers []slog.Handler
+
+	stdHandler, err := log.NewStdHandler(cfg.slogLevel(), cfg.LogStdFormat, cfg.LogFieldsPrefix, cfg.LogStdEnableGcpFields)
+	if err != nil {
+		return nil, fmt.Errorf("get standard logger handler: %w", err)
+	}
+	handlers = append(handlers, stdHandler)
+
+	// We need a logger for the other providers.
+	// We'll use the stdHandler for now.
+	bootstrapLogger := slog.New(stdHandler)
+
+	// OpenTelemetry.
+	var shutdowns []func(context.Context) error
+
+	shutdownFn, err := internalotel.InitTracerProvider(bootstrapLogger, cfg.ServiceName, cfg.ServiceVersion)
+	if err != nil {
+		return nil, fmt.Errorf("initialize OpenTelemetry tracer provider: %w", err)
+	}
+	shutdowns = append(shutdowns, shutdownFn)
+
+	shutdownFn, err = internalotel.InitMeterProvider(bootstrapLogger, cfg.ServiceName, cfg.ServiceVersion)
+	if err != nil {
+		return nil, fmt.Errorf("initialize OpenTelemetry meter provider: %w", err)
+	}
+	shutdowns = append(shutdowns, shutdownFn)
+
+	shutdownFn, otelHandler, err := internalotel.InitLoggerProvider(bootstrapLogger, cfg.ServiceName, cfg.ServiceVersion)
+	if err != nil {
+		return nil, fmt.Errorf("initialize OpenTelemetry logger provider: %w", err)
+	}
+	handlers = append(handlers, log.LevelFilter(otelHandler, cfg.slogLevel()))
+	shutdowns = append(shutdowns, shutdownFn)
+
+	// Global logger.
+	log.InitLogger(log.NewGotenbergHandler(log.FanOut(handlers...), cfg.LogFieldsPrefix))
+
+	return func(ctx context.Context) error {
+		filterErr := func(err error) error {
+			if errors.Is(err, context.Canceled) {
+				return nil
+			}
+			return err
+		}
+
+		var wg sync.WaitGroup
+		var errs error
+		var mu sync.Mutex
+
+		for _, fn := range shutdowns {
+			wg.Add(1)
+
+			go func(shutdownFn func(context.Context) error) {
+				defer wg.Done()
+
+				shutdownErr := shutdownFn(ctx)
+				if filterErr(shutdownErr) != nil {
+					mu.Lock()
+					errs = errors.Join(errs, shutdownErr)
+					mu.Unlock()
+				}
+			}(fn)
+		}
+
+		wg.Wait()
+		return errs
+	}, nil
+}
+
+// Logger returns the global logger.
+func Logger(mod Module) *slog.Logger {
+	return log.Logger().With(slog.String("logger", mod.Descriptor().ID))
+}
+
+const (
+	// instrumentationName is the name of the OpenTelemetry instrumentation
+	// library.
+	instrumentationName = "github.com/gotenberg/gotenberg"
+)
+
+// Tracer returns a [trace.Tracer] with the instrumentation name and version
+// already set.
+func Tracer() trace.Tracer {
+	return otel.GetTracerProvider().Tracer(
+		instrumentationName,
+		trace.WithInstrumentationVersion(Version),
+	)
+}
+
+// Meter returns a [metric.Meter] with the instrumentation name and version
+// already set.
+func Meter() metric.Meter {
+	return otel.GetMeterProvider().Meter(
+		instrumentationName,
+		metric.WithInstrumentationVersion(Version),
+	)
+}
+
+// LeveledLogger is a wrapper around a [slog.Logger] so that it may be used by a
+// [retryablehttp.Client].
+type LeveledLogger struct {
+	logger *slog.Logger
+	ctx    context.Context
+}
+
+// NewLeveledLogger instantiates a [LeveledLogger].
+func NewLeveledLogger(logger *slog.Logger) *LeveledLogger {
+	return &LeveledLogger{
+		logger: logger,
+		ctx:    context.Background(),
+	}
+}
+
+// WithContext returns a new [LeveledLogger] with the given context.
+func (leveled LeveledLogger) WithContext(ctx context.Context) *LeveledLogger {
+	return &LeveledLogger{
+		logger: leveled.logger,
+		ctx:    ctx,
+	}
+}
+
+// Error logs a message at the error level using the wrapped slog.Logger.
+func (leveled LeveledLogger) Error(msg string, keysAndValues ...any) {
+	leveled.logger.ErrorContext(leveled.ctx, fmt.Sprintf("%s: %+v", msg, keysAndValues))
+}
+
+// Warn logs a message at the warning level using the wrapped slog.Logger.
+func (leveled LeveledLogger) Warn(msg string, keysAndValues ...any) {
+	leveled.logger.WarnContext(leveled.ctx, fmt.Sprintf("%s: %+v", msg, keysAndValues))
+}
+
+// Info logs a message at the info level using the wrapped slog.Logger.
+func (leveled LeveledLogger) Info(msg string, keysAndValues ...any) {
+	leveled.logger.InfoContext(leveled.ctx, fmt.Sprintf("%s: %+v", msg, keysAndValues))
+}
+
+// Debug logs a message at the debug level using the wrapped slog.Logger.
+func (leveled LeveledLogger) Debug(msg string, keysAndValues ...any) {
+	leveled.logger.DebugContext(leveled.ctx, fmt.Sprintf("%s: %+v", msg, keysAndValues))
+}
+
+// Interface guards.
+var (
+	_ retryablehttp.LeveledLogger = (*LeveledLogger)(nil)
+)

pkg/modules/api/api.go

@@ -4,8 +4,10 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"net"
 	"net/http"
+	"os"
 	"sort"
 	"strings"
 	"time"
@@ -15,7 +17,6 @@ import (
 	"github.com/labstack/echo/v4"
 	flag "github.com/spf13/pflag"
 	"go.uber.org/multierr"
-	"go.uber.org/zap"
 	"golang.org/x/net/http2"
 	"golang.org/x/sync/errgroup"
 
@@ -27,22 +28,25 @@ func init() {
 }
 
 // Api is a module that provides an HTTP server. Other modules may add routes,
-// middlewares or health checks.
+// middlewares, or health checks.
 type Api struct {
-	port                      int
+	port                             int
-	bindIp                    string
+	bindIp                           string
-	tlsCertFile               string
+	tlsCertFile                      string
-	tlsKeyFile                string
+	tlsKeyFile                       string
-	startTimeout              time.Duration
+	startTimeout                     time.Duration
-	bodyLimit                 int64
+	bodyLimit                        int64
-	timeout                   time.Duration
+	timeout                          time.Duration
-	rootPath                  string
+	rootPath                         string
-	traceHeader               string
+	basicAuthUsername                string
-	basicAuthUsername         string
+	basicAuthPassword                string
-	basicAuthPassword         string
+	correlationIdHeader              string
-	downloadFromCfg           downloadFromConfig
+	downloadFromCfg                  downloadFromConfig
-	disableHealthCheckLogging bool
+	disableHealthCheckRouteTelemetry bool
-	enableDebugRoute          bool
+	disableRootRouteTelemetry        bool
+	disableVersionRouteTelemetry     bool
+	disableDebugRouteTelemetry       bool
+	enableDebugRoute                 bool
 
 	routes              []Route
 	externalMiddlewares []Middleware
@@ -50,7 +54,7 @@ type Api struct {
 	readyFn             []func() error
 	asyncCounters       []AsynchronousCounter
 	fs                  *gotenberg.FileSystem
-	logger              *zap.Logger
+	logger              *slog.Logger
 	srv                 *echo.Echo
 }
 
@@ -80,9 +84,9 @@ type Route struct {
 	// Optional.
 	IsMultipart bool
 
-	// DisableLogging disables the logging for this route.
+	// DisableTelemetry disables the telemetry and logging for this route.
 	// Optional.
-	DisableLogging bool
+	DisableTelemetry bool
 
 	// Handler is the function that handles the request.
 	// Required.
@@ -118,29 +122,6 @@ const (
 
 // Middleware is a middleware that can be added to the [Api]'s middlewares
 // chain.
-//
-//	middleware := Middleware{
-//	  Handler: func() echo.MiddlewareFunc {
-//	    return func(next echo.HandlerFunc) echo.HandlerFunc {
-//	      return func(c echo.Context) error {
-//	        rootPath := c.Get("rootPath").(string)
-//	        healthURI := fmt.Sprintf("%shealth", rootPath)
-//
-//	        // Skip the middleware if health check URI.
-//	        if c.Request().RequestURI == healthURI {
-//	          // Call the next middleware in the chain.
-//	          return next(c)
-//	        }
-//
-//	        // Your middleware process.
-//	        // ...
-//
-//	        // Call the next middleware in the chain.
-//	        return next(c)
-//	      }
-//	    }
-//	  }(),
-//	}
 type Middleware struct {
 	// Stack tells in which stack the middleware should be located.
 	// Default to [DefaultStack].
@@ -190,14 +171,18 @@ func (a *Api) Descriptor() gotenberg.ModuleDescriptor {
 			fs.Duration("api-timeout", time.Duration(30)*time.Second, "Set the time limit for requests")
 			fs.String("api-body-limit", "", "Set the body limit for multipart/form-data requests - it accepts values like 5MB, 1GB, etc")
 			fs.String("api-root-path", "/", "Set the root path of the API - for service discovery via URL paths")
-			fs.String("api-trace-header", "Gotenberg-Trace", "Set the header name to use for identifying requests")
 			fs.Bool("api-enable-basic-auth", false, "Enable basic authentication - will look for the GOTENBERG_API_BASIC_AUTH_USERNAME and GOTENBERG_API_BASIC_AUTH_PASSWORD environment variables")
+			fs.String("api-correlation-id-header", "X-Correlation-ID", "Set the header name to use to set the correlation id in the logs")
 			fs.String("api-download-from-allow-list", "", "Set the allowed URLs for the download from feature using a regular expression")
 			fs.String("api-download-from-deny-list", "", "Set the denied URLs for the download from feature using a regular expression")
 			fs.Int("api-download-from-max-retry", 4, "Set the maximum number of retries for the download from feature")
 			fs.Bool("api-disable-download-from", false, "Disable the download from feature")
-			fs.Bool("api-disable-health-check-logging", false, "Disable health check logging")
+			fs.Bool("api-disable-health-check-route-telemetry", false, "Disable the health check route telemetry")
+			fs.Bool("api-disable-root-route-telemetry", false, "Disable the root route telemetry")
+			fs.Bool("api-disable-version-route-telemetry", false, "Disable the version route telemetry")
+			fs.Bool("api-disable-debug-route-telemetry", false, "Disable the debug route telemetry")
 			fs.Bool("api-enable-debug-route", false, "Enable the debug route")
+
 			return fs
 		}(),
 		New: func() gotenberg.Module { return new(Api) },
@@ -215,14 +200,17 @@ func (a *Api) Provision(ctx *gotenberg.Context) error {
 	a.timeout = flags.MustDuration("api-timeout")
 	a.bodyLimit = flags.MustHumanReadableBytes("api-body-limit")
 	a.rootPath = flags.MustString("api-root-path")
-	a.traceHeader = flags.MustString("api-trace-header")
+	a.correlationIdHeader = flags.MustString("api-correlation-id-header")
 	a.downloadFromCfg = downloadFromConfig{
 		allowList: flags.MustRegexp("api-download-from-allow-list"),
 		denyList:  flags.MustRegexp("api-download-from-deny-list"),
 		maxRetry:  flags.MustInt("api-download-from-max-retry"),
 		disable:   flags.MustBool("api-disable-download-from"),
 	}
-	a.disableHealthCheckLogging = flags.MustBool("api-disable-health-check-logging")
+	a.disableHealthCheckRouteTelemetry = flags.MustBool("api-disable-health-check-route-telemetry")
+	a.disableRootRouteTelemetry = flags.MustBool("api-disable-root-route-telemetry")
+	a.disableVersionRouteTelemetry = flags.MustBool("api-disable-version-route-telemetry")
+	a.disableDebugRouteTelemetry = flags.MustBool("api-disable-debug-route-telemetry")
 	a.enableDebugRoute = flags.MustBool("api-enable-debug-route")
 
 	// Port from env?
@@ -328,17 +316,7 @@ func (a *Api) Provision(ctx *gotenberg.Context) error {
 	}
 
 	// Logger.
-	loggerProvider, err := ctx.Module(new(gotenberg.LoggerProvider))
+	a.logger = gotenberg.Logger(a)
-	if err != nil {
-		return fmt.Errorf("get logger provider: %w", err)
-	}
-
-	logger, err := loggerProvider.(gotenberg.LoggerProvider).Logger(a)
-	if err != nil {
-		return fmt.Errorf("get logger: %w", err)
-	}
-
-	a.logger = logger
 
 	// File system.
 	a.fs = gotenberg.NewFileSystem(new(gotenberg.OsMkdirAll))
@@ -378,12 +356,6 @@ func (a *Api) Validate() error {
 		)
 	}
 
-	if len(strings.TrimSpace(a.traceHeader)) == 0 {
-		err = multierr.Append(err,
-			errors.New("trace header must not be empty"),
-		)
-	}
-
 	if err != nil {
 		return err
 	}
@@ -442,28 +414,48 @@ func (a *Api) Start() error {
 	a.srv.HTTPErrorHandler = httpErrorHandler()
 
 	// Let's prepare the modules' routes.
-	var disableLoggingForPaths []string
+	var disableTelemetryForPaths []string
 	for i, route := range a.routes {
 		a.routes[i].Path = strings.TrimPrefix(route.Path, "/")
 
-		if route.DisableLogging {
+		if route.DisableTelemetry {
-			disableLoggingForPaths = append(disableLoggingForPaths, strings.TrimPrefix(route.Path, "/"))
+			disableTelemetryForPaths = append(disableTelemetryForPaths, strings.TrimPrefix(route.Path, "/"))
 		}
 	}
-
+	// Check if the user wishes to disable telemetry for system routes.
-	// Check if the user wishes to add logging entries related to the health
+	// Note: root path will be used as prefix in the underlying middlewares.
-	// check route.
+	if a.disableHealthCheckRouteTelemetry {
-	if a.disableHealthCheckLogging {
+		disableTelemetryForPaths = append(disableTelemetryForPaths, "health")
-		disableLoggingForPaths = append(disableLoggingForPaths, "health")
 	}
 
+	if a.disableRootRouteTelemetry {
+		disableTelemetryForPaths = append(disableTelemetryForPaths, "")
+	}
+
+	if a.disableVersionRouteTelemetry {
+		disableTelemetryForPaths = append(disableTelemetryForPaths, "version")
+	}
+
+	if a.disableDebugRouteTelemetry {
+		disableTelemetryForPaths = append(disableTelemetryForPaths, "debug")
+	}
+
+	// Always disable telemetry for favicon.
+	disableTelemetryForPaths = append(disableTelemetryForPaths,
+		"favicon.ico",
+	)
+
 	// Add the API middlewares.
+	hostname, err := os.Hostname()
+	if err != nil {
+		return fmt.Errorf("get hostname: %w", err)
+	}
+
 	a.srv.Pre(
 		latencyMiddleware(),
 		rootPathMiddleware(a.rootPath),
-		traceMiddleware(a.traceHeader),
 		outputFilenameMiddleware(),
-		loggerMiddleware(a.logger, disableLoggingForPaths),
+		telemetryMiddleware(a.logger, hostname, a.correlationIdHeader, disableTelemetryForPaths),
 	)
 
 	// Add the modules' middlewares in their respective stacks.
@@ -583,7 +575,7 @@ func (a *Api) Start() error {
 		eg.Go(f)
 	}
 
-	err := eg.Wait()
+	err = eg.Wait()
 	if err != nil {
 		return fmt.Errorf("waiting for modules readiness: %w", err)
 	}
@@ -600,7 +592,8 @@ func (a *Api) Start() error {
 			err = a.srv.StartH2CServer(fmt.Sprintf("%s:%d", a.bindIp, a.port), server)
 		}
 		if !errors.Is(err, http.ErrServerClosed) {
-			a.logger.Fatal(err.Error())
+			a.logger.ErrorContext(context.Background(), err.Error())
+			os.Exit(1)
 		}
 	}()
 
@@ -627,12 +620,12 @@ func (a *Api) Stop(ctx context.Context) error {
 		case <-ctx.Done():
 			return a.srv.Shutdown(ctx)
 		default:
-			a.logger.Debug(fmt.Sprintf("%d asynchronous requests", count))
+			a.logger.DebugContext(ctx, fmt.Sprintf("%d asynchronous requests", count))
 			if count > 0 {
 				time.Sleep(1 * time.Second)
 				continue
 			}
-			a.logger.Debug("no more asynchronous requests, continue with shutdown")
+			a.logger.DebugContext(ctx, "no more asynchronous requests, continue with shutdown")
 			err := a.srv.Shutdown(ctx)
 			if err != nil {
 				return fmt.Errorf("shutdown: %w", err)

pkg/modules/api/context.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log/slog"
 	"mime"
 	"mime/multipart"
 	"net/http"
@@ -19,11 +20,14 @@ import (
 	"github.com/hashicorp/go-retryablehttp"
 	"github.com/labstack/echo/v4"
 	"github.com/mholt/archives"
-	"go.uber.org/zap"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/propagation"
+	"go.opentelemetry.io/otel/trace"
 	"golang.org/x/sync/errgroup"
 	"golang.org/x/text/unicode/norm"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
+	semconvutil "github.com/gotenberg/gotenberg/v8/pkg/gotenberg/semconv"
 )
 
 var (
@@ -36,7 +40,7 @@ var (
 	ErrOutOfBoundsOutputPath = errors.New("output path is not within context's working directory")
 )
 
-// Context is the request context for a "multipart/form-data" requests.
+// Context is the request context for a "multipart/form-data" request.
 type Context struct {
 	dirPath      string
 	values       map[string][]string
@@ -45,7 +49,7 @@ type Context struct {
 	outputPaths  []string
 	cancelled    bool
 
-	logger     *zap.Logger
+	logger     *slog.Logger
 	echoCtx    echo.Context
 	mkdirAll   gotenberg.MkdirAll
 	pathRename gotenberg.PathRename
@@ -81,18 +85,12 @@ type downloadFrom struct {
 	// ExtraHttpHeaders are the HTTP headers to send alongside.
 	ExtraHttpHeaders map[string]string `json:"extraHttpHeaders"`
 
-	// Embedded routes the downloaded file as an embed. Deprecated: use
+	// Download as an attachment file.
-	// Field instead. Kept for backward compatibility.
+	Attachment bool `json:"attachment"`
-	Embedded bool `json:"embedded"`
-
-	// Field routes the downloaded file to a specific form field bucket.
-	// Supported values: "watermark", "stamp". For embeds, prefer the
-	// Embedded flag or set Field to "embedded".
-	Field string `json:"field"`
 }
 
 // newContext returns a [Context] by parsing a "multipart/form-data" request.
-func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSystem, timeout time.Duration, bodyLimit int64, downloadFromCfg downloadFromConfig, traceHeader, trace string) (*Context, context.CancelFunc, error) {
+func newContext(echoCtx echo.Context, logger *slog.Logger, fs *gotenberg.FileSystem, timeout time.Duration, bodyLimit int64, downloadFromCfg downloadFromConfig) (*Context, context.CancelFunc, error) {
 	processCtx, processCancel := context.WithTimeout(echoCtx.Request().Context(), timeout)
 
 	// We want to make sure the multipart/form-data does not exceed a given
@@ -137,12 +135,12 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 
 			err := os.RemoveAll(ctx.dirPath)
 			if err != nil {
-				ctx.logger.Error(fmt.Sprintf("remove context's working directory: %s", err))
+				ctx.logger.ErrorContext(ctx, fmt.Sprintf("remove context's working directory: %s", err))
 
 				return
 			}
 
-			ctx.logger.Debug(fmt.Sprintf("'%s' context's working directory removed", ctx.dirPath))
+			ctx.logger.DebugContext(ctx, fmt.Sprintf("'%s' context's working directory removed", ctx.dirPath))
 			ctx.cancelled = true
 		}
 	}()
@@ -230,9 +228,9 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 					return fmt.Errorf("filter URL: %w", err)
 				}
 
-				logger.Debug(fmt.Sprintf("download file from '%s'", dl.Url))
+				logger.DebugContext(ctx, fmt.Sprintf("download file from '%s'", dl.Url))
 
-				req, err := retryablehttp.NewRequest(http.MethodGet, dl.Url, nil)
+				req, err := retryablehttp.NewRequestWithContext(ctx, http.MethodGet, dl.Url, nil)
 				if err != nil {
 					return fmt.Errorf("create request to '%s': %w", dl.Url, err)
 				}
@@ -241,7 +239,20 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 				for key, value := range dl.ExtraHttpHeaders {
 					req.Header.Set(key, value)
 				}
-				req.Header.Set(traceHeader, trace)
+				req.Header.Set(echoCtx.Get("correlationIdHeader").(string), echoCtx.Get("correlationId").(string))
+
+				// OpenTelemetry.
+				meter := gotenberg.Meter()
+				semconvClient := semconvutil.NewHTTPClient(meter)
+
+				tracer := gotenberg.Tracer()
+				traceCtx, span := tracer.Start(ctx, fmt.Sprintf("%s Download From", req.Method),
+					trace.WithSpanKind(trace.SpanKindClient),
+					trace.WithAttributes(semconvClient.RequestTraceAttrs(req.Request)...),
+				)
+				defer span.End()
+
+				otel.GetTextMapPropagator().Inject(traceCtx, propagation.HeaderCarrier(req.Header))
 
 				client := &retryablehttp.Client{
 					HTTPClient: &http.Client{
@@ -250,22 +261,27 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 					RetryMax:     downloadFromCfg.maxRetry,
 					RetryWaitMin: time.Duration(1) * time.Second,
 					RetryWaitMax: time.Until(deadline),
-					Logger:       gotenberg.NewLeveledLogger(logger),
+					Logger:       gotenberg.NewLeveledLogger(logger).WithContext(ctx),
 					CheckRetry:   retryablehttp.DefaultRetryPolicy,
 					Backoff:      retryablehttp.DefaultBackoff,
 				}
 
 				resp, err := client.Do(req)
 				if err != nil {
+					span.RecordError(err)
+					span.SetStatus(semconvClient.Status(0))
 					return WrapError(
 						fmt.Errorf("download file from to '%s': %w", dl.Url, err),
 						NewSentinelHttpError(http.StatusBadRequest, fmt.Sprintf("Unable to download file from '%s': %s", dl.Url, err)),
 					)
 				}
+
+				span.SetAttributes(semconvClient.ResponseTraceAttrs(resp)...)
+				span.SetStatus(semconvClient.Status(resp.StatusCode))
 				defer func() {
 					err := resp.Body.Close()
 					if err != nil {
-						logger.Error(fmt.Sprintf("close response body from '%s': %s", dl.Url, err))
+						logger.ErrorContext(ctx, fmt.Sprintf("close response body from '%s': %s", dl.Url, err))
 					}
 				}()
 
@@ -307,7 +323,7 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 				// normalized.
 				// See: https://github.com/gotenberg/gotenberg/issues/662.
 				filename = norm.NFC.String(filepath.Base(filename))
-				path := fmt.Sprintf("%s/%s", ctx.dirPath, filename)
+				path := fmt.Sprintf("%s/%s", dirPath, filename)
 
 				out, err := os.Create(path)
 				if err != nil {
@@ -316,7 +332,7 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 				defer func() {
 					err := out.Close()
 					if err != nil {
-						logger.Error(fmt.Sprintf("close local file: %s", err))
+						logger.ErrorContext(ctx, fmt.Sprintf("close local file: %s", err))
 					}
 				}()
 
@@ -329,15 +345,8 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 				}
 
 				ctx.files[filename] = path
-
+				if dl.Attachment {
-				// Route the downloaded file to the appropriate field bucket.
+					ctx.filesByField[AttachmentsFormField] = append(ctx.filesByField[AttachmentsFormField], path)
-				switch {
-				case dl.Field == "embedded" || dl.Embedded:
-					ctx.filesByField[EmbedsFormField] = append(ctx.filesByField[EmbedsFormField], path)
-				case dl.Field == "watermark":
-					ctx.filesByField[WatermarkFormField] = append(ctx.filesByField[WatermarkFormField], path)
-				case dl.Field == "stamp":
-					ctx.filesByField[StampFormField] = append(ctx.filesByField[StampFormField], path)
 				}
 
 				return nil
@@ -359,7 +368,7 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 		defer func() {
 			err := in.Close()
 			if err != nil {
-				logger.Error(fmt.Sprintf("close file header: %s", err))
+				logger.ErrorContext(ctx, fmt.Sprintf("close file header: %s", err))
 			}
 		}()
 
@@ -379,7 +388,7 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 		defer func() {
 			err := out.Close()
 			if err != nil {
-				logger.Error(fmt.Sprintf("close local file: %s", err))
+				logger.ErrorContext(ctx, fmt.Sprintf("close local file: %s", err))
 			}
 		}()
 
@@ -407,10 +416,10 @@ func newContext(echoCtx echo.Context, logger *zap.Logger, fs *gotenberg.FileSyst
 		}
 	}
 
-	ctx.Log().Debug(fmt.Sprintf("form fields: %+v", ctx.values))
+	ctx.Log().DebugContext(ctx, fmt.Sprintf("form fields: %+v", ctx.values))
-	ctx.Log().Debug(fmt.Sprintf("form files: %+v", ctx.files))
+	ctx.Log().DebugContext(ctx, fmt.Sprintf("form files: %+v", ctx.files))
-	ctx.Log().Debug(fmt.Sprintf("form files by field: %+v", ctx.filesByField))
+	ctx.Log().DebugContext(ctx, fmt.Sprintf("form files by field: %+v", ctx.filesByField))
-	ctx.Log().Debug(fmt.Sprintf("total bytes: %d", totalBytesRead.Load()))
+	ctx.Log().DebugContext(ctx, fmt.Sprintf("total bytes: %d", totalBytesRead.Load()))
 
 	return ctx, cancel, err
 }
@@ -457,7 +466,7 @@ func (ctx *Context) CreateSubDirectory(dirName string) (string, error) {
 // Rename is just a wrapper around [os.Rename], as we need to mock this
 // behavior in our tests.
 func (ctx *Context) Rename(oldpath, newpath string) error {
-	ctx.Log().Debug(fmt.Sprintf("rename %s to %s", oldpath, newpath))
+	ctx.Log().DebugContext(ctx, fmt.Sprintf("rename %s to %s", oldpath, newpath))
 	err := ctx.pathRename.Rename(oldpath, newpath)
 	if err != nil {
 		return fmt.Errorf("rename path: %w", err)
@@ -483,8 +492,8 @@ func (ctx *Context) AddOutputPaths(paths ...string) error {
 	return nil
 }
 
-// Log returns the context [zap.Logger].
+// Log returns the context [slog.Logger].
-func (ctx *Context) Log() *zap.Logger {
+func (ctx *Context) Log() *slog.Logger {
 	return ctx.logger
 }
 
@@ -500,7 +509,7 @@ func (ctx *Context) BuildOutputFile() (string, error) {
 	}
 
 	if len(ctx.outputPaths) == 1 {
-		ctx.logger.Debug(fmt.Sprintf("only one output file '%s', skip archive creation", ctx.outputPaths[0]))
+		ctx.logger.DebugContext(ctx, fmt.Sprintf("only one output file '%s', skip archive creation", ctx.outputPaths[0]))
 		return ctx.outputPaths[0], nil
 	}
 
@@ -523,7 +532,7 @@ func (ctx *Context) BuildOutputFile() (string, error) {
 	defer func(out *os.File) {
 		err := out.Close()
 		if err != nil {
-			ctx.logger.Error(fmt.Sprintf("close zip file: %s", err))
+			ctx.logger.ErrorContext(ctx, fmt.Sprintf("close zip file: %s", err))
 		}
 	}(out)
 
@@ -532,7 +541,7 @@ func (ctx *Context) BuildOutputFile() (string, error) {
 		return "", fmt.Errorf("archive output files: %w", err)
 	}
 
-	ctx.logger.Debug(fmt.Sprintf("archive '%s' created", archivePath))
+	ctx.logger.DebugContext(ctx, fmt.Sprintf("archive '%s' created", archivePath))
 
 	return archivePath, nil
 }

pkg/modules/api/context_test.go

@@ -3,14 +3,15 @@ package api
 import (
 	"bytes"
 	"context"
+	"log/slog"
 	"mime/multipart"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"testing"
 	"time"
 
 	"github.com/labstack/echo/v4"
-	"go.uber.org/zap"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
@@ -35,14 +36,14 @@ func TestNewContext_Cancellation(t *testing.T) {
 	rec := httptest.NewRecorder()
 	c := e.NewContext(req, rec)
 
-	logger := zap.NewNop()
+	logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
 	fs := gotenberg.NewFileSystem(new(gotenberg.OsMkdirAll))
 	timeout := time.Duration(10) * time.Second
 	downloadFromCfg := downloadFromConfig{
 		disable: true,
 	}
 
-	ctx, cancel, err := newContext(c, logger, fs, timeout, 0, downloadFromCfg, "trace", "trace")
+	ctx, cancel, err := newContext(c, logger, fs, timeout, 0, downloadFromCfg)
 	if err != nil {
 		t.Fatalf("expected no error from newContext, got: %v", err)
 	}

pkg/modules/api/formdata.go

@@ -17,15 +17,9 @@ import (
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
 
+// AttachmentsFormField represents the form field name for attaching files.
 const (
-	// EmbedsFormField represents the form field name for embedding files.
+	AttachmentsFormField string = "attachments"
-	EmbedsFormField string = "embeds"
-
-	// WatermarkFormField represents the form field name for the watermark file.
-	WatermarkFormField string = "watermark"
-
-	// StampFormField represents the form field name for the stamp file.
-	StampFormField string = "stamp"
 )
 
 // FormData is a helper for validating and hydrating values from a
@@ -371,20 +365,20 @@ func (form *FormData) Paths(extensions []string, target *[]string) *FormData {
 	return form.paths(extensions, target)
 }
 
-// Embeds binds the absolute paths of form data files that should be
+// Attachments binds the absolute paths of form data files that should be
-// embedded in the PDF. Only files uploaded with the "embeds" field name
+// attached in the PDF. Only files uploaded with the "attachments" field name
 // will be included.
 //
-//	var embeds []string
+//	var attachments []string
 //
-//	ctx.FormData().Embeds(&embeds)
+//	ctx.FormData().Attachments(&attachments)
-func (form *FormData) Embeds(target *[]string) *FormData {
+func (form *FormData) Attachments(target *[]string) *FormData {
 	if form.errors != nil {
 		return form
 	}
 
-	// Get files from the "embeds" field
+	// Get files from the "attachments" field
-	if paths, ok := form.filesByField[EmbedsFormField]; ok {
+	if paths, ok := form.filesByField[AttachmentsFormField]; ok {
 		*target = append(*target, paths...)
 	}
 
@@ -412,54 +406,14 @@ func (form *FormData) MandatoryPaths(extensions []string, target *[]string) *For
 	return form
 }
 
-// Watermark binds the absolute path of the form data file that should be
-// used as a watermark source. Only a file uploaded with the "watermark"
-// field name will be included.
-func (form *FormData) Watermark(target *string) *FormData {
-	if form.errors != nil {
-		return form
-	}
-
-	if paths, ok := form.filesByField[WatermarkFormField]; ok && len(paths) > 0 {
-		*target = paths[0]
-	}
-
-	return form
-}
-
-// Stamp binds the absolute path of the form data file that should be
-// used as a stamp source. Only a file uploaded with the "stamp"
-// field name will be included.
-func (form *FormData) Stamp(target *string) *FormData {
-	if form.errors != nil {
-		return form
-	}
-
-	if paths, ok := form.filesByField[StampFormField]; ok && len(paths) > 0 {
-		*target = paths[0]
-	}
-
-	return form
-}
-
 // paths bind the absolute paths of form data files, according to a list of
 // file extensions, to a string slice variable.
-// embeds, watermark, and stamp files are excluded.
+// attachments are excluded.
 func (form *FormData) paths(extensions []string, target *[]string) *FormData {
-	embeds, ok := form.filesByField[EmbedsFormField]
+	attachments, ok := form.filesByField[AttachmentsFormField]
-	watermarks, wmOk := form.filesByField[WatermarkFormField]
-	stamps, stOk := form.filesByField[StampFormField]
 
 	for filename, path := range form.files {
-		if ok && slices.Contains(embeds, path) {
+		if ok && slices.Contains(attachments, path) {
-			continue
-		}
-
-		if wmOk && slices.Contains(watermarks, path) {
-			continue
-		}
-
-		if stOk && slices.Contains(stamps, path) {
 			continue
 		}
 

pkg/modules/api/formdata_test.go

@@ -1613,15 +1613,15 @@ func TestFormData_Paths(t *testing.T) {
 			expectCount: 2,
 		},
 		{
-			scenario: "files except embeds",
+			scenario: "files except attachments",
 			form: &FormData{
 				files: map[string]string{
-					"foo.pdf":     "/foo.pdf",
+					"foo.pdf":           "/foo.pdf",
-					"embed_1.pdf": "/embed_1.pdf",
+					"attachments_1.pdf": "/attachments_1.pdf",
-					"embed_2.xml": "/embed_2.xml",
+					"attachments_2.xml": "/attachments_2.xml",
 				},
 				filesByField: map[string][]string{
-					"embeds": {"/embed_1.pdf", "/embed_2.xml"},
+					"attachments": {"/attachments_1.pdf", "/attachments_2.xml"},
 				},
 			},
 			extensions: []string{".pdf"},
@@ -1759,7 +1759,7 @@ func TestFormData_mustAssign(t *testing.T) {
 	form.mustAssign("foo", "foo", &target)
 }
 
-func TestFormData_Embeds(t *testing.T) {
+func TestFormData_Attachments(t *testing.T) {
 	expected := []string{"/bar.xml", "/baz.xml"}
 
 	var actual []string
@@ -1770,13 +1770,13 @@ func TestFormData_Embeds(t *testing.T) {
 			"baz.xml": "/baz.xml",
 		},
 		filesByField: map[string][]string{
-			"embeds": {"/bar.xml", "/baz.xml"},
+			"attachments": {"/bar.xml", "/baz.xml"},
 		},
 	}
-	form.Embeds(&actual)
+	form.Attachments(&actual)
 
 	if len(actual) != len(expected) {
-		t.Errorf("expected %d embeds but got %d", len(expected), len(actual))
+		t.Errorf("expected %d attachments but got %d", len(expected), len(actual))
 	}
 
 	if !reflect.DeepEqual(actual, expected) {

pkg/modules/api/middlewares.go

@@ -5,6 +5,8 @@ import (
 	"crypto/subtle"
 	"errors"
 	"fmt"
+	"io"
+	"log/slog"
 	"net/http"
 	"path/filepath"
 	"strings"
@@ -13,9 +15,13 @@ import (
 	"github.com/google/uuid"
 	"github.com/labstack/echo/v4"
 	"github.com/labstack/echo/v4/middleware"
-	"go.uber.org/zap"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/propagation"
+	"go.opentelemetry.io/otel/trace"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
+	semconvutil "github.com/gotenberg/gotenberg/v8/pkg/gotenberg/semconv"
 )
 
 var (
@@ -61,14 +67,6 @@ func ParseError(err error) (int, string) {
 		return http.StatusBadRequest, "At least one PDF engine cannot process the requested metadata, while others may have failed to convert due to different issues"
 	}
 
-	if errors.Is(err, gotenberg.ErrPdfStampSourceNotSupported) {
-		return http.StatusBadRequest, "At least one PDF engine cannot process the requested stamp source type, while others may have failed due to different issues"
-	}
-
-	if errors.Is(err, gotenberg.ErrPdfRotateAngleNotSupported) {
-		return http.StatusBadRequest, "At least one PDF engine cannot process the requested rotation angle, while others may have failed due to different issues"
-	}
-
 	var invalidArgsError *gotenberg.PdfEngineInvalidArgsError
 	if errors.As(err, &invalidArgsError) {
 		return http.StatusBadRequest, invalidArgsError.Error()
@@ -87,14 +85,14 @@ func ParseError(err error) (int, string) {
 // returns a response as "text/plain; charset=UTF-8".
 func httpErrorHandler() echo.HTTPErrorHandler {
 	return func(err error, c echo.Context) {
-		logger := c.Get("logger").(*zap.Logger)
+		logger := c.Get("logger").(*slog.Logger)
 		status, message := ParseError(err)
 
 		c.Response().Header().Add(echo.HeaderContentType, echo.MIMETextPlainCharsetUTF8)
 
 		err = c.String(status, message)
 		if err != nil {
-			logger.Error(fmt.Sprintf("send error response: %s", err.Error()))
+			logger.ErrorContext(c.Request().Context(), fmt.Sprintf("send error response: %s", err.Error()))
 		}
 	}
 }
@@ -138,32 +136,6 @@ func rootPathMiddleware(rootPath string) echo.MiddlewareFunc {
 	}
 }
 
-// traceMiddleware sets the request identifier in the [echo.Context] under
-// "trace". Its value is either retrieved from the trace header or generated if
-// the header is not present / its value is empty.
-//
-//	trace := c.Get("trace").(string)
-//	traceHeader := c.Get("traceHeader").(string).
-func traceMiddleware(header string) echo.MiddlewareFunc {
-	return func(next echo.HandlerFunc) echo.HandlerFunc {
-		return func(c echo.Context) error {
-			// Get or create the request identifier.
-			trace := c.Request().Header.Get(header)
-
-			if trace == "" {
-				trace = uuid.New().String()
-			}
-
-			c.Set("trace", trace)
-			c.Set("traceHeader", header)
-			c.Response().Header().Add(header, trace)
-
-			// Call the next middleware in the chain.
-			return next(c)
-		}
-	}
-}
-
 // outputFilenameMiddleware sets the output filename in the [echo.Context]
 // under "outputFilename".
 //
@@ -183,59 +155,28 @@ func outputFilenameMiddleware() echo.MiddlewareFunc {
 	}
 }
 
-// loggerMiddleware sets the logger in the [echo.Context] under "logger" and
+// telemetryMiddleware manages telemetry. It sets the correlation ID in the
-// logs a synchronous request result.
+// [echo.Context] under "correlationId".
 //
-//	logger := c.Get("logger").(*zap.Logger)
+//	correlationIdHeader := c.Get("correlationIdHeader").(string)
-func loggerMiddleware(logger *zap.Logger, disableLoggingForPaths []string) echo.MiddlewareFunc {
+//	correlationId := c.Get("correlationId").(string)
+func telemetryMiddleware(logger *slog.Logger, serverName, correlationIdHeader string, disableTelemetryForPaths []string) echo.MiddlewareFunc {
+	meter := gotenberg.Meter()
+	semconvSrv := semconvutil.NewHTTPServer(meter)
+
 	return func(next echo.HandlerFunc) echo.HandlerFunc {
 		return func(c echo.Context) error {
 			startTime := c.Get("startTime").(time.Time)
-			trace := c.Get("trace").(string)
 			rootPath := c.Get("rootPath").(string)
 
-			// Create the application logger and add it to our locals.
+			request := c.Request()
-			appLogger := logger.
+			savedCtx := request.Context()
-				With(zap.String("log_type", "application")).
+			defer func() {
-				With(zap.String("trace", trace))
+				request = request.WithContext(savedCtx)
+				c.SetRequest(request)
+			}()
 
-			c.Set("logger", appLogger.Named(func() string {
+			routePath := func() string {
-				return strings.ReplaceAll(
-					strings.ReplaceAll(c.Request().URL.Path, rootPath, ""),
-					"/",
-					"",
-				)
-			}()))
-
-			// Call the next middleware in the chain.
-			err := next(c)
-			if err != nil {
-				c.Error(err)
-			}
-
-			// Create the access logger.
-			accessLogger := logger.
-				With(zap.String("log_type", "access")).
-				With(zap.String("trace", trace))
-
-			for _, path := range disableLoggingForPaths {
-				URI := fmt.Sprintf("%s%s", rootPath, path)
-
-				if c.Request().RequestURI == URI {
-					return nil
-				}
-			}
-
-			// Last piece for calculating the latency.
-			finishTime := time.Now()
-
-			// Now, let's log!
-			fields := make([]zap.Field, 12)
-			fields[0] = zap.String("remote_ip", c.RealIP())
-			fields[1] = zap.String("host", c.Request().Host)
-			fields[2] = zap.String("uri", c.Request().RequestURI)
-			fields[3] = zap.String("method", c.Request().Method)
-			fields[4] = zap.String("path", func() string {
 				path := c.Request().URL.Path
 
 				if path == "" {
@@ -243,21 +184,127 @@ func loggerMiddleware(logger *zap.Logger, disableLoggingForPaths []string) echo.
 				}
 
 				return path
-			}())
+			}()
-			fields[5] = zap.String("referer", c.Request().Referer())
+
-			fields[6] = zap.String("user_agent", c.Request().UserAgent())
+			// Evaluate if we should skip telemetry for this path.
-			fields[7] = zap.Int("status", c.Response().Status)
+			skipTelemetry := false
-			fields[8] = zap.Int64("latency", int64(finishTime.Sub(startTime)))
+			for _, path := range disableTelemetryForPaths {
-			fields[9] = zap.String("latency_human", finishTime.Sub(startTime).String())
+				URI := fmt.Sprintf("%s%s", rootPath, path)
-			fields[10] = zap.Int64("bytes_in", c.Request().ContentLength)
+				if c.Request().RequestURI == URI {
-			fields[11] = zap.Int64("bytes_out", c.Response().Size)
+					skipTelemetry = true
+					break
+				}
+			}
+
+			if skipTelemetry {
+				c.Set("logger", slog.New(slog.NewJSONHandler(io.Discard, nil)))
+
+				err := next(c)
+				if err != nil {
+					c.Error(err)
+				}
+				return nil
+			}
+
+			correlationId := request.Header.Get(correlationIdHeader)
+			if correlationId == "" {
+				correlationId = uuid.NewString()
+			}
+			c.Set("correlationIdHeader", correlationIdHeader)
+			c.Set("correlationId", correlationId)
+
+			ctx := otel.GetTextMapPropagator().Extract(savedCtx, propagation.HeaderCarrier(request.Header))
+
+			rAttr := semconvSrv.Route(routePath)
+			opts := []trace.SpanStartOption{
+				trace.WithAttributes(
+					semconvSrv.RequestTraceAttrs(serverName, request, semconvutil.RequestTraceAttrsOpts{})...,
+				),
+				trace.WithSpanKind(trace.SpanKindServer),
+				trace.WithAttributes(rAttr),
+			}
+			spanName := strings.ToUpper(c.Request().Method) + " " + routePath
+
+			tracer := gotenberg.Tracer()
+			ctx, span := tracer.Start(ctx, spanName, opts...)
+			defer span.End()
+
+			otel.GetTextMapPropagator().Inject(ctx, propagation.HeaderCarrier(c.Response().Header()))
+
+			c.Response().Header().Set(correlationIdHeader, correlationId)
+			c.SetRequest(c.Request().WithContext(ctx))
+
+			appLogger := logger.
+				With(slog.String("log_type", "application")).
+				With(slog.String("correlation_id", correlationId))
+
+			loggerName := strings.ReplaceAll(
+				strings.ReplaceAll(c.Request().URL.Path, rootPath, ""),
+				"/",
+				"",
+			)
+
+			c.Set("logger", appLogger.With(slog.String("logger", loggerName)))
+
+			// Call the next middleware in the chain.
+			err := next(c)
+			finishTime := time.Now()
+
+			status := c.Response().Status
+			if err != nil {
+				parsedStatus, _ := ParseError(err)
+				status = parsedStatus
+
+				span.SetAttributes(attribute.String("error", err.Error()))
+				c.Error(err)
+			}
+
+			span.SetStatus(semconvSrv.Status(status))
+			span.SetAttributes(semconvSrv.ResponseTraceAttrs(semconvutil.ResponseTelemetry{
+				StatusCode: status,
+				WriteBytes: c.Response().Size,
+			})...)
+
+			accessLogger := logger.
+				With(slog.String("log_type", "access")).
+				With(slog.String("correlation_id", correlationId)).
+				With(slog.String("remote_ip", c.RealIP())).
+				With(slog.String("host", c.Request().Host)).
+				With(slog.String("uri", c.Request().RequestURI)).
+				With(slog.String("method", c.Request().Method)).
+				With(slog.String("path", routePath)).
+				With(slog.String("referer", c.Request().Referer())).
+				With(slog.String("user_agent", c.Request().UserAgent())).
+				With(slog.Int("status", c.Response().Status)).
+				With(slog.Int64("latency", int64(finishTime.Sub(startTime)))).
+				With(slog.String("latency_human", finishTime.Sub(startTime).String())).
+				With(slog.Int64("bytes_in", c.Request().ContentLength)).
+				With(slog.Int64("bytes_out", c.Response().Size))
 
 			if err != nil {
-				accessLogger.Error(err.Error(), fields...)
+				accessLogger.ErrorContext(ctx, err.Error())
 			} else {
-				accessLogger.Info("request handled", fields...)
+				accessLogger.InfoContext(ctx, "request handled")
 			}
 
+			additionalAttributes := []attribute.KeyValue{
+				semconvSrv.Route(routePath),
+			}
+
+			semconvSrv.RecordMetrics(ctx, semconvutil.ServerMetricData{
+				ServerName:   serverName,
+				ResponseSize: c.Response().Size,
+				MetricAttributes: semconvutil.MetricAttributes{
+					Req:                  request,
+					StatusCode:           status,
+					AdditionalAttributes: additionalAttributes,
+				},
+				MetricData: semconvutil.MetricData{
+					RequestSize: request.ContentLength,
+					ElapsedTime: float64(time.Since(startTime)) / float64(time.Millisecond),
+				},
+			})
+
 			return nil
 		}
 	}
@@ -284,13 +331,11 @@ func basicAuthMiddleware(username, password string) echo.MiddlewareFunc {
 func contextMiddleware(fs *gotenberg.FileSystem, timeout time.Duration, bodyLimit int64, downloadFromCfg downloadFromConfig) echo.MiddlewareFunc {
 	return func(next echo.HandlerFunc) echo.HandlerFunc {
 		return func(c echo.Context) error {
-			logger := c.Get("logger").(*zap.Logger)
+			logger := c.Get("logger").(*slog.Logger)
-			traceHeader := c.Get("traceHeader").(string)
-			trace := c.Get("trace").(string)
 
 			// We create a context with a timeout so that underlying processes are
 			// able to stop early and correctly handle a timeout scenario.
-			ctx, cancel, err := newContext(c, logger, fs, timeout, bodyLimit, downloadFromCfg, traceHeader, trace)
+			ctx, cancel, err := newContext(c, logger, fs, timeout, bodyLimit, downloadFromCfg)
 			if err != nil {
 				cancel()
 
@@ -344,7 +389,7 @@ func contextMiddleware(fs *gotenberg.FileSystem, timeout time.Duration, bodyLimi
 func hardTimeoutMiddleware(hardTimeout time.Duration) echo.MiddlewareFunc {
 	return func(next echo.HandlerFunc) echo.HandlerFunc {
 		return func(c echo.Context) error {
-			logger := c.Get("logger").(*zap.Logger)
+			logger := c.Get("logger").(*slog.Logger)
 
 			// Define a hard timeout if the route handler fails to timeout as
 			// expected.
@@ -361,7 +406,7 @@ func hardTimeoutMiddleware(hardTimeout time.Duration) echo.MiddlewareFunc {
 				// This deferred function allows us to recover from such scenarios.
 				defer func() {
 					if r := recover(); r != nil {
-						logger.Debug(fmt.Sprintf("recovering from a panic (possible cause being a hard timeout): %s", r))
+						logger.DebugContext(hardTimeoutCtx, fmt.Sprintf("recovering from a panic (possible cause being a hard timeout): %s", r))
 					}
 				}()
 
@@ -373,7 +418,7 @@ func hardTimeoutMiddleware(hardTimeout time.Duration) echo.MiddlewareFunc {
 			case err := <-errChan:
 				return err
 			case <-hardTimeoutCtx.Done():
-				logger.Debug("hard timeout as the route handler did not timeout as expected")
+				logger.DebugContext(hardTimeoutCtx, "hard timeout as the route handler did not timeout as expected")
 
 				return fmt.Errorf("hard timeout: %w", hardTimeoutCtx.Err())
 			}

pkg/modules/api/mocks.go

@@ -1,9 +1,10 @@
 package api
 
 import (
+	"log/slog"
+
 	"github.com/alexliesenfeld/health"
 	"github.com/labstack/echo/v4"
-	"go.uber.org/zap"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
@@ -73,8 +74,8 @@ func (ctx *ContextMock) OutputPaths() []string {
 // SetLogger sets the logger.
 //
 //	ctx := &api.ContextMock{Context: &api.Context{}}
-//	ctx.SetLogger(zap.NewNop())
+//	ctx.SetLogger(slog.New(slog.NewJSONHandler(os.Stdout, nil)))
-func (ctx *ContextMock) SetLogger(logger *zap.Logger) {
+func (ctx *ContextMock) SetLogger(logger *slog.Logger) {
 	ctx.logger = logger
 }
 

pkg/modules/chromium/browser.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"os"
 	"strings"
 	"sync"
@@ -18,15 +19,18 @@ import (
 	"github.com/chromedp/chromedp"
 	"github.com/dlclark/regexp2"
 	"github.com/shirou/gopsutil/v4/process"
-	"go.uber.org/zap"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
+	semconv "go.opentelemetry.io/otel/semconv/v1.39.0"
+	"go.opentelemetry.io/otel/trace"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
 
 type browser interface {
 	gotenberg.Process
-	pdf(ctx context.Context, logger *zap.Logger, url, outputPath string, options PdfOptions) error
+	pdf(ctx context.Context, logger *slog.Logger, url, outputPath string, options PdfOptions) error
-	screenshot(ctx context.Context, logger *zap.Logger, url, outputPath string, options ScreenshotOptions) error
+	screenshot(ctx context.Context, logger *slog.Logger, url, outputPath string, options ScreenshotOptions) error
 }
 
 type browserArguments struct {
@@ -72,12 +76,15 @@ func newChromiumBrowser(arguments browserArguments) browser {
 	return b
 }
 
-func (b *chromiumBrowser) Start(logger *zap.Logger) error {
+func (b *chromiumBrowser) Start(logger *slog.Logger) error {
 	if b.isStarted.Load() {
 		return errors.New("browser is already started")
 	}
 
-	debug := &debugLogger{logger: logger}
+	debug := &debugLogger{
+		ctx:    b.initialCtx,
+		logger: logger,
+	}
 	b.userProfileDirPath = b.fs.NewDirPath()
 
 	// See https://github.com/gotenberg/gotenberg/issues/1293.
@@ -164,7 +171,7 @@ func (b *chromiumBrowser) Start(logger *zap.Logger) error {
 	return nil
 }
 
-func (b *chromiumBrowser) Stop(logger *zap.Logger) error {
+func (b *chromiumBrowser) Stop(logger *slog.Logger) error {
 	if !b.isStarted.Load() {
 		// No big deal? Like calling cancel twice.
 		return nil
@@ -181,7 +188,7 @@ func (b *chromiumBrowser) Stop(logger *zap.Logger) error {
 		// Clean up stuck processes.
 		ps, err := process.Processes()
 		if err != nil {
-			logger.Error(fmt.Sprintf("list processes: %v", err))
+			logger.ErrorContext(context.Background(), fmt.Sprintf("list processes: %v", err))
 		} else {
 			for _, p := range ps {
 				func() {
@@ -199,9 +206,9 @@ func (b *chromiumBrowser) Stop(logger *zap.Logger) error {
 
 					err = p.KillWithContext(killCtx)
 					if err != nil {
-						logger.Error(fmt.Sprintf("kill process: %v", err))
+						logger.ErrorContext(killCtx, fmt.Sprintf("kill process: %v", err))
 					} else {
-						logger.Debug(fmt.Sprintf("Chromium process %d killed", p.Pid))
+						logger.DebugContext(killCtx, fmt.Sprintf("Chromium process %d killed", p.Pid))
 					}
 				}()
 			}
@@ -215,15 +222,15 @@ func (b *chromiumBrowser) Stop(logger *zap.Logger) error {
 
 			err = os.RemoveAll(userProfileDirPath)
 			if err != nil {
-				logger.Error(fmt.Sprintf("remove Chromium's user profile directory: %s", err))
+				logger.ErrorContext(context.Background(), fmt.Sprintf("remove Chromium's user profile directory: %s", err))
 			} else {
-				logger.Debug(fmt.Sprintf("'%s' Chromium's user profile directory removed", userProfileDirPath))
+				logger.DebugContext(context.Background(), fmt.Sprintf("'%s' Chromium's user profile directory removed", userProfileDirPath))
 			}
 
 			// Also, remove Chromium-specific files in the temporary directory.
-			err = gotenberg.GarbageCollect(logger, os.TempDir(), []string{".org.chromium.Chromium", ".com.google.Chrome"}, expirationTime)
+			err = gotenberg.GarbageCollect(context.Background(), logger, os.TempDir(), []string{".org.chromium.Chromium", ".com.google.Chrome"}, expirationTime)
 			if err != nil {
-				logger.Error(err.Error())
+				logger.ErrorContext(context.Background(), err.Error())
 			}
 		}()
 	}(copyUserProfileDirPath, expirationTime)
@@ -239,7 +246,7 @@ func (b *chromiumBrowser) Stop(logger *zap.Logger) error {
 	return nil
 }
 
-func (b *chromiumBrowser) Healthy(logger *zap.Logger) bool {
+func (b *chromiumBrowser) Healthy(logger *slog.Logger) bool {
 	// Good to know: the supervisor does not call this method if no first start
 	// or if the process is restarting.
 
@@ -266,14 +273,14 @@ func (b *chromiumBrowser) Healthy(logger *zap.Logger) bool {
 		return err
 	}))
 	if err != nil {
-		logger.Error(fmt.Sprintf("browser health check failed: %s", err))
+		logger.ErrorContext(ctx, fmt.Sprintf("browser health check failed: %s", err))
 		return false
 	}
 
 	return true
 }
 
-func (b *chromiumBrowser) pdf(ctx context.Context, logger *zap.Logger, url, outputPath string, options PdfOptions) error {
+func (b *chromiumBrowser) pdf(ctx context.Context, logger *slog.Logger, url, outputPath string, options PdfOptions) error {
 	// Note: no error wrapping because it leaks on errors we want to display to
 	// the end user.
 	return b.do(ctx, logger, url, options.Options, chromedp.Tasks{
@@ -285,7 +292,7 @@ func (b *chromiumBrowser) pdf(ctx context.Context, logger *zap.Logger, url, outp
 		disableJavaScriptActionFunc(logger, b.arguments.disableJavaScript),
 		setCookiesActionFunc(logger, options.Cookies),
 		userAgentOverride(logger, options.UserAgent),
-		navigateActionFunc(logger, url, options.SkipNetworkIdleEvent),
+		navigateActionFunc(logger, url, options.SkipNetworkIdleEvent, options.SkipNetworkAlmostIdleEvent),
 		hideDefaultWhiteBackgroundActionFunc(logger, options.OmitBackground, options.PrintBackground),
 		forceExactColorsActionFunc(logger, options.PrintBackground),
 		emulateMediaTypeActionFunc(logger, options.EmulatedMediaType, options.EmulatedMediaFeatures),
@@ -299,7 +306,7 @@ func (b *chromiumBrowser) pdf(ctx context.Context, logger *zap.Logger, url, outp
 	})
 }
 
-func (b *chromiumBrowser) screenshot(ctx context.Context, logger *zap.Logger, url, outputPath string, options ScreenshotOptions) error {
+func (b *chromiumBrowser) screenshot(ctx context.Context, logger *slog.Logger, url, outputPath string, options ScreenshotOptions) error {
 	// Note: no error wrapping because it leaks on errors we want to display to
 	// the end user.
 	return b.do(ctx, logger, url, options.Options, chromedp.Tasks{
@@ -311,7 +318,7 @@ func (b *chromiumBrowser) screenshot(ctx context.Context, logger *zap.Logger, ur
 		disableJavaScriptActionFunc(logger, b.arguments.disableJavaScript),
 		setCookiesActionFunc(logger, options.Cookies),
 		userAgentOverride(logger, options.UserAgent),
-		navigateActionFunc(logger, url, options.SkipNetworkIdleEvent),
+		navigateActionFunc(logger, url, options.SkipNetworkIdleEvent, options.SkipNetworkAlmostIdleEvent),
 		hideDefaultWhiteBackgroundActionFunc(logger, options.OmitBackground, true),
 		forceExactColorsActionFunc(logger, true),
 		emulateMediaTypeActionFunc(logger, options.EmulatedMediaType, options.EmulatedMediaFeatures),
@@ -326,7 +333,7 @@ func (b *chromiumBrowser) screenshot(ctx context.Context, logger *zap.Logger, ur
 	})
 }
 
-func (b *chromiumBrowser) do(ctx context.Context, logger *zap.Logger, url string, options Options, tasks chromedp.Tasks) error {
+func (b *chromiumBrowser) do(ctx context.Context, logger *slog.Logger, url string, options Options, tasks chromedp.Tasks) error {
 	if !b.isStarted.Load() {
 		return errors.New("browser not started, cannot handle tasks")
 	}
@@ -412,7 +419,26 @@ func (b *chromiumBrowser) do(ctx context.Context, logger *zap.Logger, url string
 		resourceLoadingFailedMu: &resourceLoadingFailedMu,
 	})
 
-	err = chromedp.Run(taskCtx, tasks...)
+	clientCtx, clientSpan := gotenberg.Tracer().Start(taskCtx, "cdp.execute",
+		trace.WithSpanKind(trace.SpanKindClient),
+		trace.WithAttributes(
+			semconv.ServerAddress("127.0.0.1"),
+			semconv.ServicePeerName("chromium"),
+			semconv.RPCSystemNameKey.String("cdp"),
+			// Legacy attribute for older APMs (Datadog, Jaeger) to draw the
+			// dependency graph.
+			attribute.String("peer.service", "chromium"),
+		),
+	)
+
+	err = chromedp.Run(clientCtx, tasks...)
+	if err != nil {
+		clientSpan.RecordError(err)
+		clientSpan.SetStatus(codes.Error, err.Error())
+	}
+
+	clientSpan.End()
+
 	if err != nil {
 		errMessage := err.Error()
 

pkg/modules/chromium/chromium.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"os"
 	"os/exec"
 	"strings"
@@ -14,7 +15,9 @@ import (
 	"github.com/chromedp/cdproto/network"
 	"github.com/dlclark/regexp2"
 	flag "github.com/spf13/pflag"
-	"go.uber.org/zap"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/metric"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 	"github.com/gotenberg/gotenberg/v8/pkg/modules/api"
@@ -91,10 +94,17 @@ type Chromium struct {
 	maxConcurrency int64
 	args           browserArguments
 
-	logger     *zap.Logger
+	logger     *slog.Logger
 	browser    browser
 	supervisor gotenberg.ProcessSupervisor
 	engine     gotenberg.PdfEngine
+
+	reqsCounter               metric.Int64Counter
+	errsCounter               metric.Int64Counter
+	conversionDurationCounter metric.Float64Histogram
+	queueWaitDurationCounter  metric.Float64Histogram
+	pdfOutputSizeCounter      metric.Int64Histogram
+	imageOutputSizeCounter    metric.Int64Histogram
 }
 
 // Options are the common options for all conversions.
@@ -105,6 +115,10 @@ type Options struct {
 	// rendered until this event is fired.
 	SkipNetworkIdleEvent bool
 
+	// SkipNetworkAlmostIdleEvent set if the conversion should wait for the
+	// "networkAlmostIdle" event.
+	SkipNetworkAlmostIdleEvent bool
+
 	// FailOnHttpStatusCodes sets if the conversion should fail if the status
 	// code from the main page matches with one of its entries.
 	FailOnHttpStatusCodes []int64
@@ -191,6 +205,7 @@ type EmulatedMediaFeature struct {
 func DefaultOptions() Options {
 	return Options{
 		SkipNetworkIdleEvent:            true,
+		SkipNetworkAlmostIdleEvent:      true,
 		FailOnHttpStatusCodes:           []int64{499, 599},
 		FailOnResourceHttpStatusCodes:   nil,
 		IgnoreResourceHttpStatusDomains: nil,
@@ -268,7 +283,7 @@ type PdfOptions struct {
 	PreferCssPageSize bool
 
 	// GenerateDocumentOutline defines whether the document outline should be
-	// embedded into the PDF.
+	// attached into the PDF.
 	GenerateDocumentOutline bool
 
 	// GenerateTaggedPdf defines whether to generate tagged (accessible)
@@ -389,8 +404,8 @@ type ExtraHttpHeader struct {
 
 // Api helps to interact with Chromium for converting HTML documents to PDF.
 type Api interface {
-	Pdf(ctx context.Context, logger *zap.Logger, url, outputPath string, options PdfOptions) error
+	Pdf(ctx context.Context, logger *slog.Logger, url, outputPath string, options PdfOptions) error
-	Screenshot(ctx context.Context, logger *zap.Logger, url, outputPath string, options ScreenshotOptions) error
+	Screenshot(ctx context.Context, logger *slog.Logger, url, outputPath string, options ScreenshotOptions) error
 }
 
 // Provider is a module interface that exposes a method for creating an [Api]
@@ -428,13 +443,6 @@ func (mod *Chromium) Descriptor() gotenberg.ModuleDescriptor {
 			fs.Bool("chromium-disable-javascript", false, "Disable JavaScript")
 			fs.Bool("chromium-disable-routes", false, "Disable the routes")
 
-			// Deprecated flags.
-			fs.Bool("chromium-incognito", false, "Start Chromium with incognito mode")
-			err := fs.MarkDeprecated("chromium-incognito", "this flag is ignored as it provides no benefits")
-			if err != nil {
-				panic(err)
-			}
-
 			return fs
 		}(),
 		New: func() gotenberg.Module { return new(Chromium) },
@@ -477,15 +485,7 @@ func (mod *Chromium) Provision(ctx *gotenberg.Context) error {
 	}
 
 	// Logger.
-	loggerProvider, err := ctx.Module(new(gotenberg.LoggerProvider))
+	mod.logger = gotenberg.Logger(mod).With(slog.String("logger", "browser"))
-	if err != nil {
-		return fmt.Errorf("get logger provider: %w", err)
-	}
-	logger, err := loggerProvider.(gotenberg.LoggerProvider).Logger(mod)
-	if err != nil {
-		return fmt.Errorf("get logger: %w", err)
-	}
-	mod.logger = logger.Named("browser")
 
 	// Process.
 	mod.browser = newChromiumBrowser(mod.args)
@@ -502,6 +502,106 @@ func (mod *Chromium) Provision(ctx *gotenberg.Context) error {
 	}
 	mod.engine = engine
 
+	// OpenTelemetry.
+	meter := gotenberg.Meter()
+	_, err = meter.Int64ObservableCounter(
+		"chromium.process.restarts.total",
+		metric.WithDescription("Current number of Chromium restarts."),
+		metric.WithUnit("{restart}"),
+		metric.WithInt64Callback(func(_ context.Context, o metric.Int64Observer) error {
+			val := mod.supervisor.RestartsCount()
+			o.Observe(val)
+			return nil
+		}),
+	)
+	if err != nil {
+		return fmt.Errorf("create process restarts observable counter: %w", err)
+	}
+
+	_, err = meter.Int64ObservableGauge(
+		"chromium.requests.queue_size",
+		metric.WithDescription("Current number of Chromium conversion requests waiting to be treated."),
+		metric.WithUnit("{request}"),
+		metric.WithInt64Callback(func(_ context.Context, o metric.Int64Observer) error {
+			val := mod.supervisor.ReqQueueSize()
+			o.Observe(val)
+			return nil
+		}),
+	)
+	if err != nil {
+		return fmt.Errorf("create requests queue size observable gauge: %w", err)
+	}
+
+	_, err = meter.Int64ObservableGauge(
+		"chromium.requests.active",
+		metric.WithDescription("Current number of Chromium conversion requests actively being processed."),
+		metric.WithUnit("{request}"),
+		metric.WithInt64Callback(func(_ context.Context, o metric.Int64Observer) error {
+			val := mod.supervisor.ActiveTasksCount()
+			o.Observe(val)
+			return nil
+		}),
+	)
+	if err != nil {
+		return fmt.Errorf("create requests active observable gauge: %w", err)
+	}
+
+	mod.reqsCounter, err = meter.Int64Counter(
+		"chromium.requests.total",
+		metric.WithDescription("Total number of Chromium conversion requests."),
+		metric.WithUnit("{request}"),
+	)
+	if err != nil {
+		return fmt.Errorf("create requests total counter: %w", err)
+	}
+
+	mod.errsCounter, err = meter.Int64Counter(
+		"chromium.errors.total",
+		metric.WithDescription("Total number of Chromium errors."),
+		metric.WithUnit("{error}"),
+	)
+	if err != nil {
+		return fmt.Errorf("create errors total counter: %w", err)
+	}
+
+	mod.conversionDurationCounter, err = meter.Float64Histogram(
+		"chromium.conversion.duration",
+		metric.WithDescription("Duration of each HTML-to-PDF conversion."),
+		metric.WithUnit("s"),
+		metric.WithExplicitBucketBoundaries(0.5, 1, 2, 5, 10, 30, 60),
+	)
+	if err != nil {
+		return fmt.Errorf("create conversion duration histogram: %w", err)
+	}
+
+	mod.queueWaitDurationCounter, err = meter.Float64Histogram(
+		"chromium.queue.wait.duration",
+		metric.WithDescription("Time a request spends waiting in the queue before processing starts."),
+		metric.WithUnit("s"),
+		metric.WithExplicitBucketBoundaries(0.5, 1, 2, 5, 10, 30, 60),
+	)
+	if err != nil {
+		return fmt.Errorf("create queue wait duration histogram: %w", err)
+	}
+
+	mod.pdfOutputSizeCounter, err = meter.Int64Histogram(
+		"chromium.pdf.output.size",
+		metric.WithDescription("Size of the generated PDF files."),
+		metric.WithUnit("By"),
+	)
+	if err != nil {
+		return fmt.Errorf("create pdf output size histogram: %w", err)
+	}
+
+	mod.imageOutputSizeCounter, err = meter.Int64Histogram(
+		"chromium.image.output.size",
+		metric.WithDescription("Size of the generated image files."),
+		metric.WithUnit("By"),
+	)
+	if err != nil {
+		return fmt.Errorf("create image output size histogram: %w", err)
+	}
+
 	return nil
 }
 
@@ -552,7 +652,7 @@ func (mod *Chromium) StartupMessage() string {
 func (mod *Chromium) Stop(ctx context.Context) error {
 	// Block until the context is done so that another module may gracefully
 	// stop before we do a shutdown.
-	mod.logger.Debug("wait for the end of grace duration")
+	mod.logger.DebugContext(ctx, "wait for the end of grace duration")
 
 	<-ctx.Done()
 
@@ -581,26 +681,6 @@ func (mod *Chromium) Debug() map[string]any {
 	return debug
 }
 
-// Metrics returns the metrics.
-func (mod *Chromium) Metrics() ([]gotenberg.Metric, error) {
-	return []gotenberg.Metric{
-		{
-			Name:        "chromium_requests_queue_size",
-			Description: "Current number of Chromium conversion requests waiting to be treated.",
-			Read: func() float64 {
-				return float64(mod.supervisor.ReqQueueSize())
-			},
-		},
-		{
-			Name:        "chromium_restarts_count",
-			Description: "Current number of Chromium restarts.",
-			Read: func() float64 {
-				return float64(mod.supervisor.RestartsCount())
-			},
-		},
-	}, nil
-}
-
 // Checks adds a health check that verifies if Chromium is healthy.
 func (mod *Chromium) Checks() ([]health.CheckerOption, error) {
 	return []health.CheckerOption{
@@ -668,32 +748,163 @@ func (mod *Chromium) Routes() ([]api.Route, error) {
 }
 
 // Pdf converts a URL to PDF.
-func (mod *Chromium) Pdf(ctx context.Context, logger *zap.Logger, url, outputPath string, options PdfOptions) error {
+func (mod *Chromium) Pdf(ctx context.Context, logger *slog.Logger, url, outputPath string, options PdfOptions) error {
 	// Note: no error wrapping because it leaks on errors we want to display to
 	// the end user.
-	return mod.supervisor.Run(ctx, logger, func() error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "Chromium.Pdf")
+	defer span.End()
+
+	start := time.Now()
+	var conversionStart time.Time
+
+	err := mod.supervisor.Run(ctx, logger, func() error {
+		conversionStart = time.Now()
 		return mod.browser.pdf(ctx, logger, url, outputPath, options)
 	})
+
+	end := time.Now()
+
+	status := "success"
+	if err != nil {
+		if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
+			status = "timeout"
+		} else {
+			status = "error"
+		}
+
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+
+		reason := "unknown"
+		if errors.Is(err, context.DeadlineExceeded) {
+			reason = "timeout"
+		} else if errors.Is(err, context.Canceled) {
+			reason = "context_cancelled"
+		} else if errors.Is(err, ErrInvalidHttpStatusCode) || errors.Is(err, ErrInvalidResourceHttpStatusCode) || errors.Is(err, ErrLoadingFailed) || errors.Is(err, ErrResourceLoadingFailed) || errors.Is(err, ErrInvalidEvaluationExpression) || errors.Is(err, ErrInvalidSelectorQuery) {
+			reason = "invalid_input"
+		} else if errors.Is(err, gotenberg.ErrMaximumQueueSizeExceeded) || errors.Is(err, gotenberg.ErrProcessAlreadyRestarting) {
+			reason = "chromium_unavailable"
+		}
+
+		mod.errsCounter.Add(ctx, 1, metric.WithAttributes(
+			attribute.String("reason", reason),
+		))
+	}
+
+	if !conversionStart.IsZero() {
+		waitDuration := conversionStart.Sub(start).Seconds()
+		conversionDuration := end.Sub(conversionStart).Seconds()
+
+		mod.queueWaitDurationCounter.Record(ctx, waitDuration, metric.WithAttributes(
+			attribute.String("status", status),
+		))
+		mod.conversionDurationCounter.Record(ctx, conversionDuration, metric.WithAttributes(
+			attribute.String("status", status),
+		))
+	} else {
+		waitDuration := end.Sub(start).Seconds()
+		mod.queueWaitDurationCounter.Record(ctx, waitDuration, metric.WithAttributes(
+			attribute.String("status", status),
+		))
+	}
+
+	mod.reqsCounter.Add(ctx, 1, metric.WithAttributes(
+		attribute.String("status", status),
+	))
+
+	if err == nil {
+		if fileInfo, statErr := os.Stat(outputPath); statErr == nil {
+			mod.pdfOutputSizeCounter.Record(ctx, fileInfo.Size())
+		}
+	}
+
+	return err
 }
 
-func (mod *Chromium) Screenshot(ctx context.Context, logger *zap.Logger, url, outputPath string, options ScreenshotOptions) error {
+func (mod *Chromium) Screenshot(ctx context.Context, logger *slog.Logger, url, outputPath string, options ScreenshotOptions) error {
 	// Note: no error wrapping because it leaks on errors we want to display to
 	// the end user.
-	return mod.supervisor.Run(ctx, logger, func() error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "Chromium.Screenshot")
+	defer span.End()
+
+	start := time.Now()
+	var conversionStart time.Time
+
+	err := mod.supervisor.Run(ctx, logger, func() error {
+		conversionStart = time.Now()
 		return mod.browser.screenshot(ctx, logger, url, outputPath, options)
 	})
+
+	end := time.Now()
+
+	status := "success"
+	if err != nil {
+		if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
+			status = "timeout"
+		} else {
+			status = "error"
+		}
+
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+
+		reason := "unknown"
+		if errors.Is(err, context.DeadlineExceeded) {
+			reason = "timeout"
+		} else if errors.Is(err, context.Canceled) {
+			reason = "context_cancelled"
+		} else if errors.Is(err, ErrInvalidHttpStatusCode) || errors.Is(err, ErrInvalidResourceHttpStatusCode) || errors.Is(err, ErrLoadingFailed) || errors.Is(err, ErrResourceLoadingFailed) || errors.Is(err, ErrInvalidEvaluationExpression) || errors.Is(err, ErrInvalidSelectorQuery) {
+			reason = "invalid_input"
+		} else if errors.Is(err, gotenberg.ErrMaximumQueueSizeExceeded) {
+			reason = "chromium_maximum_queue_size_exceeded"
+		} else if errors.Is(err, gotenberg.ErrProcessAlreadyRestarting) {
+			reason = "chromium_unavailable"
+		}
+
+		mod.errsCounter.Add(ctx, 1, metric.WithAttributes(
+			attribute.String("reason", reason),
+		))
+	}
+
+	if !conversionStart.IsZero() {
+		waitDuration := conversionStart.Sub(start).Seconds()
+		conversionDuration := end.Sub(conversionStart).Seconds()
+
+		mod.queueWaitDurationCounter.Record(ctx, waitDuration, metric.WithAttributes(
+			attribute.String("status", status),
+		))
+		mod.conversionDurationCounter.Record(ctx, conversionDuration, metric.WithAttributes(
+			attribute.String("status", status),
+		))
+	} else {
+		waitDuration := end.Sub(start).Seconds()
+		mod.queueWaitDurationCounter.Record(ctx, waitDuration, metric.WithAttributes(
+			attribute.String("status", status),
+		))
+	}
+
+	mod.reqsCounter.Add(ctx, 1, metric.WithAttributes(
+		attribute.String("status", status),
+	))
+
+	if err == nil {
+		if fileInfo, statErr := os.Stat(outputPath); statErr == nil {
+			mod.imageOutputSizeCounter.Record(ctx, fileInfo.Size())
+		}
+	}
+
+	return err
 }
 
 // Interface guards.
 var (
-	_ gotenberg.Module          = (*Chromium)(nil)
+	_ gotenberg.Module      = (*Chromium)(nil)
-	_ gotenberg.Provisioner     = (*Chromium)(nil)
+	_ gotenberg.Provisioner = (*Chromium)(nil)
-	_ gotenberg.Validator       = (*Chromium)(nil)
+	_ gotenberg.Validator   = (*Chromium)(nil)
-	_ gotenberg.App             = (*Chromium)(nil)
+	_ gotenberg.App         = (*Chromium)(nil)
-	_ gotenberg.Debuggable      = (*Chromium)(nil)
+	_ gotenberg.Debuggable  = (*Chromium)(nil)
-	_ gotenberg.MetricsProvider = (*Chromium)(nil)
+	_ api.HealthChecker     = (*Chromium)(nil)
-	_ api.HealthChecker         = (*Chromium)(nil)
+	_ api.Router            = (*Chromium)(nil)
-	_ api.Router                = (*Chromium)(nil)
+	_ Api                   = (*Chromium)(nil)
-	_ Api                       = (*Chromium)(nil)
+	_ Provider              = (*Chromium)(nil)
-	_ Provider                  = (*Chromium)(nil)
 )

pkg/modules/chromium/debug.go

@@ -1,28 +1,29 @@
 package chromium
 
 import (
+	"context"
 	"fmt"
 	"io"
-
+	"log/slog"
-	"go.uber.org/zap"
 )
 
-// debugLogger is wrapper around a [zap.Logger] which is used for debugging
+// debugLogger is wrapper around a [slog.Logger] which is used for debugging
 // Chromium.
 type debugLogger struct {
-	logger *zap.Logger
+	ctx    context.Context
+	logger *slog.Logger
 }
 
 // Write logs the bytes in a debug message.
 func (debug *debugLogger) Write(p []byte) (n int, err error) {
-	debug.logger.Debug(string(p))
+	debug.logger.DebugContext(debug.ctx, string(p))
 
 	return len(p), nil
 }
 
 // Printf logs a debug message.
 func (debug *debugLogger) Printf(format string, v ...any) {
-	debug.logger.Debug(fmt.Sprintf(format, v...))
+	debug.logger.DebugContext(debug.ctx, fmt.Sprintf(format, v...))
 }
 
 // Interface guards.

pkg/modules/chromium/events.go

@@ -3,6 +3,7 @@ package chromium
 import (
 	"context"
 	"fmt"
+	"log/slog"
 	"net/http"
 	"net/url"
 	"slices"
@@ -17,7 +18,6 @@ import (
 	"github.com/chromedp/chromedp"
 	"github.com/dlclark/regexp2"
 	"go.uber.org/multierr"
-	"go.uber.org/zap"
 	"golang.org/x/sync/errgroup"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
@@ -32,29 +32,29 @@ type eventRequestPausedOptions struct {
 // allowed or not.  It also set the extra HTTP headers, if any.
 // See https://github.com/gotenberg/gotenberg/issues/1011.
 // TODO: https://chromedevtools.github.io/devtools-protocol/tot/Network/#method-setBlockedURLs (experimental for now).
-func listenForEventRequestPaused(ctx context.Context, logger *zap.Logger, options eventRequestPausedOptions) {
+func listenForEventRequestPaused(ctx context.Context, logger *slog.Logger, options eventRequestPausedOptions) {
 	if len(options.extraHttpHeaders) == 0 {
-		logger.Debug("no extra HTTP headers")
+		logger.DebugContext(ctx, "no extra HTTP headers")
 	} else {
-		logger.Debug(fmt.Sprintf("extra HTTP headers: %+v", options.extraHttpHeaders))
+		logger.DebugContext(ctx, fmt.Sprintf("extra HTTP headers: %+v", options.extraHttpHeaders))
 	}
 
 	chromedp.ListenTarget(ctx, func(ev any) {
 		switch e := ev.(type) {
 		case *fetch.EventRequestPaused:
 			go func() {
-				logger.Debug(fmt.Sprintf("event EventRequestPaused fired for '%s'", e.Request.URL))
+				logger.DebugContext(ctx, fmt.Sprintf("event EventRequestPaused fired for '%s'", e.Request.URL))
 				allow := true
 
 				deadline, ok := ctx.Deadline()
 				if !ok {
-					logger.Error("context has no deadline, cannot filter URL")
+					logger.ErrorContext(ctx, "context has no deadline, cannot filter URL")
 					return
 				}
 
 				err := gotenberg.FilterDeadline(options.allowList, options.denyList, e.Request.URL, deadline)
 				if err != nil {
-					logger.Warn(err.Error())
+					logger.WarnContext(ctx, err.Error())
 					allow = false
 				}
 
@@ -65,7 +65,7 @@ func listenForEventRequestPaused(ctx context.Context, logger *zap.Logger, option
 					req := fetch.FailRequest(e.RequestID, network.ErrorReasonAccessDenied)
 					err = req.Do(executorCtx)
 					if err != nil {
-						logger.Error(fmt.Sprintf("fail request: %s", err))
+						logger.ErrorContext(ctx, fmt.Sprintf("fail request: %s", err))
 					}
 					return
 				}
@@ -81,25 +81,25 @@ func listenForEventRequestPaused(ctx context.Context, logger *zap.Logger, option
 					for _, header := range options.extraHttpHeaders {
 						if header.Scope == nil {
 							// Non-scoped header.
-							logger.Debug(fmt.Sprintf("extra HTTP header '%s' will be set for request URL '%s'", header.Name, e.Request.URL))
+							logger.DebugContext(ctx, fmt.Sprintf("extra HTTP header '%s' will be set for request URL '%s'", header.Name, e.Request.URL))
 							extraHttpHeadersToSet = append(extraHttpHeadersToSet, header)
 							continue
 						}
 
 						ok, err := header.Scope.MatchString(e.Request.URL)
 						if err != nil {
-							logger.Error(fmt.Sprintf("fail to match extra HTTP header '%s' scope with URL '%s': %s", header.Name, e.Request.URL, err))
+							logger.ErrorContext(ctx, fmt.Sprintf("fail to match extra HTTP header '%s' scope with URL '%s': %s", header.Name, e.Request.URL, err))
 						} else if ok {
-							logger.Debug(fmt.Sprintf("extra HTTP header '%s' (scoped) will be set for request URL '%s'", header.Name, e.Request.URL))
+							logger.DebugContext(ctx, fmt.Sprintf("extra HTTP header '%s' (scoped) will be set for request URL '%s'", header.Name, e.Request.URL))
 							extraHttpHeadersToSet = append(extraHttpHeadersToSet, header)
 						} else {
-							logger.Debug(fmt.Sprintf("scoped extra HTTP header '%s' (scoped) will not be set for request URL '%s'", header.Name, e.Request.URL))
+							logger.DebugContext(ctx, fmt.Sprintf("scoped extra HTTP header '%s' (scoped) will not be set for request URL '%s'", header.Name, e.Request.URL))
 						}
 					}
 				}
 
 				if len(extraHttpHeadersToSet) > 0 {
-					logger.Debug(fmt.Sprintf("setting extra HTTP headers for request URL '%s': %+v", e.Request.URL, extraHttpHeadersToSet))
+					logger.DebugContext(ctx, fmt.Sprintf("setting extra HTTP headers for request URL '%s': %+v", e.Request.URL, extraHttpHeadersToSet))
 
 					originalHeaders := e.Request.Headers
 					headers := make(map[string]string)
@@ -109,7 +109,7 @@ func listenForEventRequestPaused(ctx context.Context, logger *zap.Logger, option
 						if ok {
 							headers[key] = strValue
 						} else {
-							logger.Error(fmt.Sprintf("ignoring header '%s' for URL '%s' since it cannot be cast to a string", key, e.Request.URL))
+							logger.ErrorContext(ctx, fmt.Sprintf("ignoring header '%s' for URL '%s' since it cannot be cast to a string", key, e.Request.URL))
 						}
 					}
 
@@ -132,7 +132,7 @@ func listenForEventRequestPaused(ctx context.Context, logger *zap.Logger, option
 
 				err = req.Do(executorCtx)
 				if err != nil {
-					logger.Error(fmt.Sprintf("continue request: %s", err))
+					logger.ErrorContext(ctx, fmt.Sprintf("continue request: %s", err))
 				}
 			}()
 		}
@@ -157,7 +157,7 @@ type eventResponseReceivedOptions struct {
 // https://github.com/gotenberg/gotenberg/issues/1021.
 func listenForEventResponseReceived(
 	ctx context.Context,
-	logger *zap.Logger,
+	logger *slog.Logger,
 	options eventResponseReceivedOptions,
 ) {
 	normalizedIgnoreDomains := normalizeDomains(options.ignoreResourceHttpStatusDomains)
@@ -180,7 +180,7 @@ func listenForEventResponseReceived(
 		switch ev := ev.(type) {
 		case *network.EventResponseReceived:
 			if ev.Response.URL == options.mainPageUrl {
-				logger.Debug(fmt.Sprintf("event EventResponseReceived fired for main page: %+v", ev.Response))
+				logger.DebugContext(ctx, fmt.Sprintf("event EventResponseReceived fired for main page: %+v", ev.Response))
 
 				if slices.Contains(options.failOnHttpStatusCodes, ev.Response.Status) {
 					options.invalidHttpStatusCodeMu.Lock()
@@ -192,11 +192,11 @@ func listenForEventResponseReceived(
 				return
 			}
 
-			logger.Debug(fmt.Sprintf("event EventResponseReceived fired for a resource: %+v", ev.Response))
+			logger.DebugContext(ctx, fmt.Sprintf("event EventResponseReceived fired for a resource: %+v", ev.Response))
 
 			if slices.Contains(options.failOnResourceOnHttpStatusCode, ev.Response.Status) {
 				if !shouldCheckResourceHttpStatusCode(ev.Response.URL, normalizedIgnoreDomains) {
-					logger.Debug(fmt.Sprintf("skip resource HTTP status code check for '%s' due to domain filtering", ev.Response.URL))
+					logger.DebugContext(ctx, fmt.Sprintf("skip resource HTTP status code check for '%s' due to domain filtering", ev.Response.URL))
 					return
 				}
 
@@ -298,11 +298,11 @@ type eventLoadingFailedOptions struct {
 // https://github.com/gotenberg/gotenberg/issues/913.
 // https://github.com/gotenberg/gotenberg/issues/959.
 // https://github.com/gotenberg/gotenberg/issues/1021.
-func listenForEventLoadingFailed(ctx context.Context, logger *zap.Logger, options eventLoadingFailedOptions) {
+func listenForEventLoadingFailed(ctx context.Context, logger *slog.Logger, options eventLoadingFailedOptions) {
 	chromedp.ListenTarget(ctx, func(ev any) {
 		switch ev := ev.(type) {
 		case *network.EventLoadingFailed:
-			logger.Debug(fmt.Sprintf("event EventLoadingFailed fired: %+v", ev.ErrorText))
+			logger.DebugContext(ctx, fmt.Sprintf("event EventLoadingFailed fired: %+v", ev.ErrorText))
 
 			// We are looking for common errors.
 			// TODO: sufficient?
@@ -321,14 +321,14 @@ func listenForEventLoadingFailed(ctx context.Context, logger *zap.Logger, option
 				"net::ERR_HTTP2_PROTOCOL_ERROR",
 			}
 			if !slices.Contains(errors, ev.ErrorText) {
-				logger.Debug(fmt.Sprintf("skip EventLoadingFailed: '%s' is not part of %+v", ev.ErrorText, errors))
+				logger.DebugContext(ctx, fmt.Sprintf("skip EventLoadingFailed: '%s' is not part of %+v", ev.ErrorText, errors))
 				return
 			}
 
 			if ev.Type == network.ResourceTypeDocument {
 				// Supposition: except iframe, an event loading failed with a
 				// resource type Document is about the main page.
-				logger.Debug("event EventLoadingFailed fired for main page")
+				logger.DebugContext(ctx, "event EventLoadingFailed fired for main page")
 
 				options.loadingFailedMu.Lock()
 				defer options.loadingFailedMu.Unlock()
@@ -338,7 +338,7 @@ func listenForEventLoadingFailed(ctx context.Context, logger *zap.Logger, option
 				return
 			}
 
-			logger.Debug("event EventLoadingFailed fired for a resource")
+			logger.DebugContext(ctx, "event EventLoadingFailed fired for a resource")
 
 			options.resourceLoadingFailedMu.Lock()
 			defer options.resourceLoadingFailedMu.Unlock()
@@ -354,11 +354,11 @@ func listenForEventLoadingFailed(ctx context.Context, logger *zap.Logger, option
 // listenForEventExceptionThrown listens for exceptions in the console and
 // appends those exceptions to the given error pointer.
 // See https://github.com/gotenberg/gotenberg/issues/262.
-func listenForEventExceptionThrown(ctx context.Context, logger *zap.Logger, consoleExceptions *error, consoleExceptionsMu *sync.RWMutex) {
+func listenForEventExceptionThrown(ctx context.Context, logger *slog.Logger, consoleExceptions *error, consoleExceptionsMu *sync.RWMutex) {
 	chromedp.ListenTarget(ctx, func(ev any) {
 		switch ev := ev.(type) {
 		case *runtime.EventExceptionThrown:
-			logger.Debug(fmt.Sprintf("event EventExceptionThrown fired: %+v", ev.ExceptionDetails))
+			logger.DebugContext(ctx, fmt.Sprintf("event EventExceptionThrown fired: %+v", ev.ExceptionDetails))
 
 			consoleExceptionsMu.Lock()
 			defer consoleExceptionsMu.Unlock()
@@ -370,7 +370,7 @@ func listenForEventExceptionThrown(ctx context.Context, logger *zap.Logger, cons
 
 // waitForEventDomContentEventFired waits until the event DomContentEventFired
 // is fired or the context timeout.
-func waitForEventDomContentEventFired(ctx context.Context, logger *zap.Logger) func() error {
+func waitForEventDomContentEventFired(ctx context.Context, logger *slog.Logger) func() error {
 	return func() error {
 		ch := make(chan struct{})
 		cctx, cancel := context.WithCancel(ctx)
@@ -384,7 +384,7 @@ func waitForEventDomContentEventFired(ctx context.Context, logger *zap.Logger) f
 
 		select {
 		case <-ch:
-			logger.Debug("event DomContentEventFired fired")
+			logger.DebugContext(ctx, "event DomContentEventFired fired")
 			return nil
 		case <-ctx.Done():
 			return fmt.Errorf("wait for event DomContentEventFired: %w", ctx.Err())
@@ -394,7 +394,7 @@ func waitForEventDomContentEventFired(ctx context.Context, logger *zap.Logger) f
 
 // waitForEventLoadEventFired waits until the event LoadEventFired is fired or
 // the context timeout.
-func waitForEventLoadEventFired(ctx context.Context, logger *zap.Logger) func() error {
+func waitForEventLoadEventFired(ctx context.Context, logger *slog.Logger) func() error {
 	return func() error {
 		ch := make(chan struct{})
 		cctx, cancel := context.WithCancel(ctx)
@@ -408,7 +408,7 @@ func waitForEventLoadEventFired(ctx context.Context, logger *zap.Logger) func()
 
 		select {
 		case <-ch:
-			logger.Debug("event LoadEventFired fired")
+			logger.DebugContext(ctx, "event LoadEventFired fired")
 			return nil
 		case <-ctx.Done():
 			return fmt.Errorf("wait for event LoadEventFired: %w", ctx.Err())
@@ -418,7 +418,7 @@ func waitForEventLoadEventFired(ctx context.Context, logger *zap.Logger) func()
 
 // waitForEventNetworkIdle waits until the event networkIdle is fired or the
 // context timeout.
-func waitForEventNetworkIdle(ctx context.Context, logger *zap.Logger) func() error {
+func waitForEventNetworkIdle(ctx context.Context, logger *slog.Logger) func() error {
 	return func() error {
 		ch := make(chan struct{})
 		cctx, cancel := context.WithCancel(ctx)
@@ -434,7 +434,7 @@ func waitForEventNetworkIdle(ctx context.Context, logger *zap.Logger) func() err
 
 		select {
 		case <-ch:
-			logger.Debug("event networkIdle fired")
+			logger.DebugContext(ctx, "event networkIdle fired")
 			return nil
 		case <-ctx.Done():
 			return fmt.Errorf("wait for event networkIdle: %w", ctx.Err())
@@ -442,9 +442,35 @@ func waitForEventNetworkIdle(ctx context.Context, logger *zap.Logger) func() err
 	}
 }
 
+// waitForEventNetworkAlmostIdle waits until the event networkIdle2 is fired
+// or the context timeout.
+func waitForEventNetworkAlmostIdle(ctx context.Context, logger *slog.Logger) func() error {
+	return func() error {
+		ch := make(chan struct{})
+		cctx, cancel := context.WithCancel(ctx)
+		chromedp.ListenTarget(cctx, func(ev any) {
+			switch e := ev.(type) {
+			case *page.EventLifecycleEvent:
+				if e.Name == "networkIdle2" {
+					cancel()
+					close(ch)
+				}
+			}
+		})
+
+		select {
+		case <-ch:
+			logger.DebugContext(ctx, "event networkAlmostIdle fired")
+			return nil
+		case <-ctx.Done():
+			return fmt.Errorf("wait for event networkAlmostIdle: %w", ctx.Err())
+		}
+	}
+}
+
 // waitForEventLoadingFinished waits until the event LoadingFinished is fired
 // or the context timeout.
-func waitForEventLoadingFinished(ctx context.Context, logger *zap.Logger) func() error {
+func waitForEventLoadingFinished(ctx context.Context, logger *slog.Logger) func() error {
 	return func() error {
 		ch := make(chan struct{})
 		cctx, cancel := context.WithCancel(ctx)
@@ -458,7 +484,7 @@ func waitForEventLoadingFinished(ctx context.Context, logger *zap.Logger) func()
 
 		select {
 		case <-ch:
-			logger.Debug("event LoadingFinished fired")
+			logger.DebugContext(ctx, "event LoadingFinished fired")
 			return nil
 		case <-ctx.Done():
 			return fmt.Errorf("wait for event LoadingFinished: %w", ctx.Err())

pkg/modules/chromium/mocks.go

@@ -2,38 +2,37 @@ package chromium
 
 import (
 	"context"
-
+	"log/slog"
-	"go.uber.org/zap"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
 
 // ApiMock is a mock for the [Api] interface.
 type ApiMock struct {
-	PdfMock        func(ctx context.Context, logger *zap.Logger, url, outputPath string, options PdfOptions) error
+	PdfMock        func(ctx context.Context, logger *slog.Logger, url, outputPath string, options PdfOptions) error
-	ScreenshotMock func(ctx context.Context, logger *zap.Logger, url, outputPath string, options ScreenshotOptions) error
+	ScreenshotMock func(ctx context.Context, logger *slog.Logger, url, outputPath string, options ScreenshotOptions) error
 }
 
-func (api *ApiMock) Pdf(ctx context.Context, logger *zap.Logger, url, outputPath string, options PdfOptions) error {
+func (api *ApiMock) Pdf(ctx context.Context, logger *slog.Logger, url, outputPath string, options PdfOptions) error {
 	return api.PdfMock(ctx, logger, url, outputPath, options)
 }
 
-func (api *ApiMock) Screenshot(ctx context.Context, logger *zap.Logger, url, outputPath string, options ScreenshotOptions) error {
+func (api *ApiMock) Screenshot(ctx context.Context, logger *slog.Logger, url, outputPath string, options ScreenshotOptions) error {
 	return api.ScreenshotMock(ctx, logger, url, outputPath, options)
 }
 
 // browserMock is a mock for the [browser] interface.
 type browserMock struct {
 	gotenberg.ProcessMock
-	pdfMock        func(ctx context.Context, logger *zap.Logger, url, outputPath string, options PdfOptions) error
+	pdfMock        func(ctx context.Context, logger *slog.Logger, url, outputPath string, options PdfOptions) error
-	screenshotMock func(ctx context.Context, logger *zap.Logger, url, outputPath string, options ScreenshotOptions) error
+	screenshotMock func(ctx context.Context, logger *slog.Logger, url, outputPath string, options ScreenshotOptions) error
 }
 
-func (b *browserMock) pdf(ctx context.Context, logger *zap.Logger, url, outputPath string, options PdfOptions) error {
+func (b *browserMock) pdf(ctx context.Context, logger *slog.Logger, url, outputPath string, options PdfOptions) error {
 	return b.pdfMock(ctx, logger, url, outputPath, options)
 }
 
-func (b *browserMock) screenshot(ctx context.Context, logger *zap.Logger, url, outputPath string, options ScreenshotOptions) error {
+func (b *browserMock) screenshot(ctx context.Context, logger *slog.Logger, url, outputPath string, options ScreenshotOptions) error {
 	return b.screenshotMock(ctx, logger, url, outputPath, options)
 }
 

pkg/modules/chromium/routes.go

@@ -48,6 +48,7 @@ func FormDataChromiumOptions(ctx *api.Context) (*api.FormData, Options) {
 
 	var (
 		skipNetworkIdleEvent            bool
+		skipNetworkAlmostIdleEvent      bool
 		failOnHttpStatusCodes           []int64
 		failOnResourceHttpStatusCodes   []int64
 		ignoreResourceHttpStatusDomains []string
@@ -67,6 +68,7 @@ func FormDataChromiumOptions(ctx *api.Context) (*api.FormData, Options) {
 
 	form := ctx.FormData().
 		Bool("skipNetworkIdleEvent", &skipNetworkIdleEvent, defaultOptions.SkipNetworkIdleEvent).
+		Bool("skipNetworkAlmostIdleEvent", &skipNetworkAlmostIdleEvent, defaultOptions.SkipNetworkAlmostIdleEvent).
 		Custom("failOnHttpStatusCodes", func(value string) error {
 			if value == "" {
 				failOnHttpStatusCodes = defaultOptions.FailOnHttpStatusCodes
@@ -254,6 +256,7 @@ func FormDataChromiumOptions(ctx *api.Context) (*api.FormData, Options) {
 
 	options := Options{
 		SkipNetworkIdleEvent:            skipNetworkIdleEvent,
+		SkipNetworkAlmostIdleEvent:      skipNetworkAlmostIdleEvent,
 		FailOnHttpStatusCodes:           failOnHttpStatusCodes,
 		FailOnResourceHttpStatusCodes:   failOnResourceHttpStatusCodes,
 		IgnoreResourceHttpStatusDomains: ignoreResourceHttpStatusDomains,
@@ -414,12 +417,7 @@ func convertUrlRoute(chromium Api, engine gotenberg.PdfEngine) api.Route {
 			pdfFormats := pdfengines.FormDataPdfFormats(form)
 			metadata := pdfengines.FormDataPdfMetadata(form, false)
 			userPassword, ownerPassword := pdfengines.FormDataPdfEncrypt(form)
-			embedPaths := pdfengines.FormDataPdfEmbeds(form)
+			attachmentsPaths := pdfengines.FormDataPdfAttachments(form)
-			watermark := pdfengines.FormDataPdfWatermark(form, false)
-			watermarkFile := pdfengines.FormDataPdfWatermarkFile(form)
-			stamp := pdfengines.FormDataPdfStamp(form, false)
-			stampFile := pdfengines.FormDataPdfStampFile(form)
-			rotateAngle, rotatePages := pdfengines.FormDataPdfRotate(form, false)
 
 			var url string
 			err := form.
@@ -429,14 +427,7 @@ func convertUrlRoute(chromium Api, engine gotenberg.PdfEngine) api.Route {
 				return fmt.Errorf("validate form data: %w", err)
 			}
 
-			if (watermark.Source == gotenberg.StampSourceImage || watermark.Source == gotenberg.StampSourcePDF) && watermarkFile != "" {
+			err = convertUrl(ctx, chromium, engine, url, options, mode, pdfFormats, metadata, userPassword, ownerPassword, attachmentsPaths)
-				watermark.Expression = watermarkFile
-			}
-			if (stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF) && stampFile != "" {
-				stamp.Expression = stampFile
-			}
-
-			err = convertUrl(ctx, chromium, engine, url, options, mode, pdfFormats, metadata, userPassword, ownerPassword, embedPaths, watermark, stamp, rotateAngle, rotatePages)
 			if err != nil {
 				return fmt.Errorf("convert URL to PDF: %w", err)
 			}
@@ -489,12 +480,7 @@ func convertHtmlRoute(chromium Api, engine gotenberg.PdfEngine) api.Route {
 			pdfFormats := pdfengines.FormDataPdfFormats(form)
 			metadata := pdfengines.FormDataPdfMetadata(form, false)
 			userPassword, ownerPassword := pdfengines.FormDataPdfEncrypt(form)
-			embedPaths := pdfengines.FormDataPdfEmbeds(form)
+			attachmentsPaths := pdfengines.FormDataPdfAttachments(form)
-			watermark := pdfengines.FormDataPdfWatermark(form, false)
-			watermarkFile := pdfengines.FormDataPdfWatermarkFile(form)
-			stamp := pdfengines.FormDataPdfStamp(form, false)
-			stampFile := pdfengines.FormDataPdfStampFile(form)
-			rotateAngle, rotatePages := pdfengines.FormDataPdfRotate(form, false)
 
 			var inputPath string
 			err := form.
@@ -504,15 +490,8 @@ func convertHtmlRoute(chromium Api, engine gotenberg.PdfEngine) api.Route {
 				return fmt.Errorf("validate form data: %w", err)
 			}
 
-			if (watermark.Source == gotenberg.StampSourceImage || watermark.Source == gotenberg.StampSourcePDF) && watermarkFile != "" {
-				watermark.Expression = watermarkFile
-			}
-			if (stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF) && stampFile != "" {
-				stamp.Expression = stampFile
-			}
-
 			url := fmt.Sprintf("file://%s", inputPath)
-			err = convertUrl(ctx, chromium, engine, url, options, mode, pdfFormats, metadata, userPassword, ownerPassword, embedPaths, watermark, stamp, rotateAngle, rotatePages)
+			err = convertUrl(ctx, chromium, engine, url, options, mode, pdfFormats, metadata, userPassword, ownerPassword, attachmentsPaths)
 			if err != nil {
 				return fmt.Errorf("convert HTML to PDF: %w", err)
 			}
@@ -566,12 +545,7 @@ func convertMarkdownRoute(chromium Api, engine gotenberg.PdfEngine) api.Route {
 			pdfFormats := pdfengines.FormDataPdfFormats(form)
 			metadata := pdfengines.FormDataPdfMetadata(form, false)
 			userPassword, ownerPassword := pdfengines.FormDataPdfEncrypt(form)
-			embedPaths := pdfengines.FormDataPdfEmbeds(form)
+			attachmentsPaths := pdfengines.FormDataPdfAttachments(form)
-			watermark := pdfengines.FormDataPdfWatermark(form, false)
-			watermarkFile := pdfengines.FormDataPdfWatermarkFile(form)
-			stamp := pdfengines.FormDataPdfStamp(form, false)
-			stampFile := pdfengines.FormDataPdfStampFile(form)
-			rotateAngle, rotatePages := pdfengines.FormDataPdfRotate(form, false)
 
 			var (
 				inputPath     string
@@ -586,19 +560,12 @@ func convertMarkdownRoute(chromium Api, engine gotenberg.PdfEngine) api.Route {
 				return fmt.Errorf("validate form data: %w", err)
 			}
 
-			if (watermark.Source == gotenberg.StampSourceImage || watermark.Source == gotenberg.StampSourcePDF) && watermarkFile != "" {
-				watermark.Expression = watermarkFile
-			}
-			if (stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF) && stampFile != "" {
-				stamp.Expression = stampFile
-			}
-
 			url, err := markdownToHtml(ctx, inputPath, markdownPaths)
 			if err != nil {
 				return fmt.Errorf("transform markdown file(s) to HTML: %w", err)
 			}
 
-			err = convertUrl(ctx, chromium, engine, url, options, mode, pdfFormats, metadata, userPassword, ownerPassword, embedPaths, watermark, stamp, rotateAngle, rotatePages)
+			err = convertUrl(ctx, chromium, engine, url, options, mode, pdfFormats, metadata, userPassword, ownerPassword, attachmentsPaths)
 			if err != nil {
 				return fmt.Errorf("convert markdown to PDF: %w", err)
 			}
@@ -722,7 +689,7 @@ func markdownToHtml(ctx *api.Context, inputPath string, markdownPaths []string)
 	return fmt.Sprintf("file://%s", inputPath), nil
 }
 
-func convertUrl(ctx *api.Context, chromium Api, engine gotenberg.PdfEngine, url string, options PdfOptions, mode gotenberg.SplitMode, pdfFormats gotenberg.PdfFormats, metadata map[string]any, userPassword, ownerPassword string, embedPaths []string, watermark, stamp gotenberg.Stamp, rotateAngle int, rotatePages string) error {
+func convertUrl(ctx *api.Context, chromium Api, engine gotenberg.PdfEngine, url string, options PdfOptions, mode gotenberg.SplitMode, pdfFormats gotenberg.PdfFormats, metadata map[string]any, userPassword, ownerPassword string, attachmentsPaths []string) error {
 	outputPath := ctx.GeneratePath(".pdf")
 	// See https://github.com/gotenberg/gotenberg/issues/1130.
 	filename := ctx.OutputFilename(outputPath)
@@ -784,48 +751,26 @@ func convertUrl(ctx *api.Context, chromium Api, engine gotenberg.PdfEngine, url
 		return fmt.Errorf("convert to PDF: %w", err)
 	}
 
-	err = pdfengines.ValidatePdfFormatsCompat(pdfFormats, userPassword, embedPaths)
-	if err != nil {
-		return err
-	}
-
 	outputPaths, err := pdfengines.SplitPdfStub(ctx, engine, mode, []string{outputPath})
 	if err != nil {
 		return fmt.Errorf("split PDF: %w", err)
 	}
 
-	err = pdfengines.WatermarkStub(ctx, engine, watermark, outputPaths)
-	if err != nil {
-		return fmt.Errorf("watermark PDFs: %w", err)
-	}
-
-	err = pdfengines.StampStub(ctx, engine, stamp, outputPaths)
-	if err != nil {
-		return fmt.Errorf("stamp PDFs: %w", err)
-	}
-
-	err = pdfengines.RotateStub(ctx, engine, rotateAngle, rotatePages, outputPaths)
-	if err != nil {
-		return fmt.Errorf("rotate PDFs: %w", err)
-	}
-
 	convertOutputPaths, err := pdfengines.ConvertStub(ctx, engine, pdfFormats, outputPaths)
 	if err != nil {
 		return fmt.Errorf("convert PDF(s): %w", err)
 	}
 
-	// Metadata, embeds are written after Convert, as LibreOffice
+	err = pdfengines.AddAttachmentsStub(ctx, engine, attachmentsPaths, convertOutputPaths)
-	// strips them during PDF/A conversion.
+	if err != nil {
+		return fmt.Errorf("add attachments into PDFs: %w", err)
+	}
+
 	err = pdfengines.WriteMetadataStub(ctx, engine, metadata, convertOutputPaths)
 	if err != nil {
 		return fmt.Errorf("write metadata: %w", err)
 	}
 
-	err = pdfengines.EmbedFilesStub(ctx, engine, embedPaths, convertOutputPaths)
-	if err != nil {
-		return fmt.Errorf("embed files into PDFs: %w", err)
-	}
-
 	err = pdfengines.EncryptPdfStub(ctx, engine, userPassword, ownerPassword, convertOutputPaths)
 	if err != nil {
 		return fmt.Errorf("encrypt PDFs: %w", err)

pkg/modules/chromium/tasks.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"os"
 	"time"
 
@@ -13,16 +14,15 @@ import (
 	"github.com/chromedp/cdproto/network"
 	"github.com/chromedp/cdproto/page"
 	"github.com/chromedp/chromedp"
-	"go.uber.org/zap"
 )
 
-func printToPdfActionFunc(logger *zap.Logger, outputPath string, options PdfOptions) chromedp.ActionFunc {
+func printToPdfActionFunc(logger *slog.Logger, outputPath string, options PdfOptions) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		paperHeight := options.PaperHeight
 		pageRanges := options.PageRanges
 
 		if options.SinglePage {
-			logger.Debug("single page PDF")
+			logger.DebugContext(ctx, "single page PDF")
 
 			_, _, _, _, _, cssContentSize, err := page.GetLayoutMetrics().Do(ctx)
 			if err != nil {
@@ -56,11 +56,11 @@ func printToPdfActionFunc(logger *zap.Logger, outputPath string, options PdfOpti
 			options.FooterTemplate != DefaultPdfOptions().FooterTemplate
 
 		if !hasCustomHeaderFooter {
-			logger.Debug("no custom header nor footer")
+			logger.DebugContext(ctx, "no custom header nor footer")
 
 			printToPdf = printToPdf.WithDisplayHeaderFooter(false)
 		} else {
-			logger.Debug("with custom header and/or footer")
+			logger.DebugContext(ctx, "with custom header and/or footer")
 
 			printToPdf = printToPdf.
 				WithDisplayHeaderFooter(true).
@@ -68,7 +68,7 @@ func printToPdfActionFunc(logger *zap.Logger, outputPath string, options PdfOpti
 				WithFooterTemplate(options.FooterTemplate)
 		}
 
-		logger.Debug(fmt.Sprintf("print to PDF with: %+v", printToPdf))
+		logger.DebugContext(ctx, fmt.Sprintf("print to PDF with: %+v", printToPdf))
 
 		_, stream, err := printToPdf.Do(ctx)
 		if err != nil {
@@ -86,7 +86,7 @@ func printToPdfActionFunc(logger *zap.Logger, outputPath string, options PdfOpti
 		defer func() {
 			err = reader.Close()
 			if err != nil {
-				logger.Error(fmt.Sprintf("close reader: %s", err))
+				logger.ErrorContext(ctx, fmt.Sprintf("close reader: %s", err))
 			}
 		}()
 
@@ -98,7 +98,7 @@ func printToPdfActionFunc(logger *zap.Logger, outputPath string, options PdfOpti
 		defer func() {
 			err = file.Close()
 			if err != nil {
-				logger.Error(fmt.Sprintf("close output path: %s", err))
+				logger.ErrorContext(ctx, fmt.Sprintf("close output path: %s", err))
 			}
 		}()
 
@@ -113,7 +113,7 @@ func printToPdfActionFunc(logger *zap.Logger, outputPath string, options PdfOpti
 	}
 }
 
-func captureScreenshotActionFunc(logger *zap.Logger, outputPath string, options ScreenshotOptions) chromedp.ActionFunc {
+func captureScreenshotActionFunc(logger *slog.Logger, outputPath string, options ScreenshotOptions) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		captureScreenshot := page.CaptureScreenshot().
 			WithCaptureBeyondViewport(true).
@@ -134,7 +134,7 @@ func captureScreenshotActionFunc(logger *zap.Logger, outputPath string, options
 				WithQuality(int64(options.Quality))
 		}
 
-		logger.Debug(fmt.Sprintf("capture screenshot with: %+v", captureScreenshot))
+		logger.DebugContext(ctx, fmt.Sprintf("capture screenshot with: %+v", captureScreenshot))
 
 		buffer, err := captureScreenshot.Do(ctx)
 		if err != nil {
@@ -149,7 +149,7 @@ func captureScreenshotActionFunc(logger *zap.Logger, outputPath string, options
 		defer func() {
 			err = file.Close()
 			if err != nil {
-				logger.Error(fmt.Sprintf("close output path: %s", err))
+				logger.ErrorContext(ctx, fmt.Sprintf("close output path: %s", err))
 			}
 		}()
 
@@ -162,9 +162,9 @@ func captureScreenshotActionFunc(logger *zap.Logger, outputPath string, options
 	}
 }
 
-func setDeviceMetricsOverride(logger *zap.Logger, width, height int) chromedp.ActionFunc {
+func setDeviceMetricsOverride(logger *slog.Logger, width, height int) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
-		logger.Debug("set device metrics override")
+		logger.DebugContext(ctx, "set device metrics override")
 
 		err := emulation.SetDeviceMetricsOverride(int64(width), int64(height), 1.0, false).Do(ctx)
 		if err == nil {
@@ -175,15 +175,15 @@ func setDeviceMetricsOverride(logger *zap.Logger, width, height int) chromedp.Ac
 	}
 }
 
-func clearCacheActionFunc(logger *zap.Logger, clear bool) chromedp.ActionFunc {
+func clearCacheActionFunc(logger *slog.Logger, clear bool) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		// See https://github.com/gotenberg/gotenberg/issues/753.
 		if !clear {
-			logger.Debug("cache not cleared")
+			logger.DebugContext(ctx, "cache not cleared")
 			return nil
 		}
 
-		logger.Debug("clear cache")
+		logger.DebugContext(ctx, "clear cache")
 
 		err := network.ClearBrowserCache().Do(ctx)
 		if err == nil {
@@ -194,15 +194,15 @@ func clearCacheActionFunc(logger *zap.Logger, clear bool) chromedp.ActionFunc {
 	}
 }
 
-func clearCookiesActionFunc(logger *zap.Logger, clear bool) chromedp.ActionFunc {
+func clearCookiesActionFunc(logger *slog.Logger, clear bool) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		// See https://github.com/gotenberg/gotenberg/issues/753.
 		if !clear {
-			logger.Debug("cookies not cleared")
+			logger.DebugContext(ctx, "cookies not cleared")
 			return nil
 		}
 
-		logger.Debug("clear cookies")
+		logger.DebugContext(ctx, "clear cookies")
 
 		err := network.ClearBrowserCookies().Do(ctx)
 		if err == nil {
@@ -213,15 +213,15 @@ func clearCookiesActionFunc(logger *zap.Logger, clear bool) chromedp.ActionFunc
 	}
 }
 
-func disableJavaScriptActionFunc(logger *zap.Logger, disable bool) chromedp.ActionFunc {
+func disableJavaScriptActionFunc(logger *slog.Logger, disable bool) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		// See https://github.com/gotenberg/gotenberg/issues/175.
 		if !disable {
-			logger.Debug("JavaScript not disabled")
+			logger.DebugContext(ctx, "JavaScript not disabled")
 			return nil
 		}
 
-		logger.Debug("disable JavaScript")
+		logger.DebugContext(ctx, "disable JavaScript")
 
 		err := emulation.SetScriptExecutionDisabled(true).Do(ctx)
 		if err == nil {
@@ -232,10 +232,10 @@ func disableJavaScriptActionFunc(logger *zap.Logger, disable bool) chromedp.Acti
 	}
 }
 
-func setCookiesActionFunc(logger *zap.Logger, cookies []Cookie) chromedp.ActionFunc {
+func setCookiesActionFunc(logger *slog.Logger, cookies []Cookie) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		if len(cookies) == 0 {
-			logger.Debug("no cookies to set")
+			logger.DebugContext(ctx, "no cookies to set")
 			return nil
 		}
 
@@ -274,21 +274,21 @@ func setCookiesActionFunc(logger *zap.Logger, cookies []Cookie) chromedp.ActionF
 				return fmt.Errorf("set cookie %s: %w", cookiePretty(cookieParams), err)
 			}
 
-			logger.Debug(fmt.Sprintf("set cookie %s", cookiePretty(cookieParams)))
+			logger.DebugContext(ctx, fmt.Sprintf("set cookie %s", cookiePretty(cookieParams)))
 		}
 
 		return nil
 	}
 }
 
-func userAgentOverride(logger *zap.Logger, userAgent string) chromedp.ActionFunc {
+func userAgentOverride(logger *slog.Logger, userAgent string) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		if len(userAgent) == 0 {
-			logger.Debug("no user agent override")
+			logger.DebugContext(ctx, "no user agent override")
 			return nil
 		}
 
-		logger.Debug(fmt.Sprintf("user agent override: %s", userAgent))
+		logger.DebugContext(ctx, fmt.Sprintf("user agent override: %s", userAgent))
 		err := emulation.SetUserAgentOverride(userAgent).Do(ctx)
 		if err == nil {
 			return nil
@@ -303,14 +303,14 @@ func userAgentOverride(logger *zap.Logger, userAgent string) chromedp.ActionFunc
 // network.SetExtraHTTPHeaders set the headers for ALL requests from the page.
 // See https://github.com/gotenberg/gotenberg/issues/1011.
 //
-//func extraHttpHeadersActionFunc(logger *zap.Logger, extraHttpHeaders map[string]string) chromedp.ActionFunc {
+//func extraHttpHeadersActionFunc(logger *slog.Logger, extraHttpHeaders map[string]string) chromedp.ActionFunc {
 //	return func(ctx context.Context) error {
 //		if len(extraHttpHeaders) == 0 {
-//			logger.Debug("no extra HTTP headers")
+//			logger.DebugContext(ctx, "no extra HTTP headers")
 //			return nil
 //		}
 //
-//		logger.Debug(fmt.Sprintf("extra HTTP headers: %+v", extraHttpHeaders))
+//		logger.DebugContext(ctx, fmt.Sprintf("extra HTTP headers: %+v", extraHttpHeaders))
 //
 //		headers := make(network.Headers, len(extraHttpHeaders))
 //		for key, value := range extraHttpHeaders {
@@ -326,9 +326,9 @@ func userAgentOverride(logger *zap.Logger, userAgent string) chromedp.ActionFunc
 //	}
 //}
 
-func navigateActionFunc(logger *zap.Logger, url string, skipNetworkIdleEvent bool) chromedp.ActionFunc {
+func navigateActionFunc(logger *slog.Logger, url string, skipNetworkIdleEvent, skipNetworkAlmostIdleEvent bool) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
-		logger.Debug(fmt.Sprintf("navigate to '%s'", url))
+		logger.DebugContext(ctx, fmt.Sprintf("navigate to '%s'", url))
 
 		_, _, _, _, err := page.Navigate(url).Do(ctx)
 		if err != nil {
@@ -344,7 +344,13 @@ func navigateActionFunc(logger *zap.Logger, url string, skipNetworkIdleEvent boo
 		if !skipNetworkIdleEvent {
 			waitFunc = append(waitFunc, waitForEventNetworkIdle(ctx, logger))
 		} else {
-			logger.Debug("skipping network idle event")
+			logger.DebugContext(ctx, "skipping network idle event")
+		}
+
+		if !skipNetworkAlmostIdleEvent {
+			waitFunc = append(waitFunc, waitForEventNetworkAlmostIdle(ctx, logger))
+		} else {
+			logger.DebugContext(ctx, "skipping network almost idle event")
 		}
 
 		err = runBatch(
@@ -360,11 +366,11 @@ func navigateActionFunc(logger *zap.Logger, url string, skipNetworkIdleEvent boo
 	}
 }
 
-func hideDefaultWhiteBackgroundActionFunc(logger *zap.Logger, omitBackground, printBackground bool) chromedp.ActionFunc {
+func hideDefaultWhiteBackgroundActionFunc(logger *slog.Logger, omitBackground, printBackground bool) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		// See https://github.com/gotenberg/gotenberg/issues/226.
 		if !omitBackground {
-			logger.Debug("default white background not hidden")
+			logger.DebugContext(ctx, "default white background not hidden")
 			return nil
 		}
 
@@ -373,7 +379,7 @@ func hideDefaultWhiteBackgroundActionFunc(logger *zap.Logger, omitBackground, pr
 			return fmt.Errorf("validate omit background: %w", ErrOmitBackgroundWithoutPrintBackground)
 		}
 
-		logger.Debug("hide default white background")
+		logger.DebugContext(ctx, "hide default white background")
 
 		err := emulation.SetDefaultBackgroundColorOverride().WithColor(
 			&cdp.RGBA{
@@ -391,7 +397,7 @@ func hideDefaultWhiteBackgroundActionFunc(logger *zap.Logger, omitBackground, pr
 	}
 }
 
-func forceExactColorsActionFunc(logger *zap.Logger, printBackground bool) chromedp.ActionFunc {
+func forceExactColorsActionFunc(logger *slog.Logger, printBackground bool) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		css := "html { -webkit-print-color-adjust: exact !important; }"
 		if !printBackground {
@@ -399,7 +405,7 @@ func forceExactColorsActionFunc(logger *zap.Logger, printBackground bool) chrome
 			// print of the background, whatever the printToPDF args.
 			// See https://github.com/gotenberg/gotenberg/issues/1154.
 			additionalCss := "html, body { background: none !important; }"
-			logger.Debug(fmt.Sprintf("inject %s as printBackground is %t", additionalCss, printBackground))
+			logger.DebugContext(ctx, fmt.Sprintf("inject %s as printBackground is %t", additionalCss, printBackground))
 			css += additionalCss
 		}
 
@@ -423,10 +429,10 @@ func forceExactColorsActionFunc(logger *zap.Logger, printBackground bool) chrome
 	}
 }
 
-func emulateMediaTypeActionFunc(logger *zap.Logger, mediaType string, mediaFeatures []EmulatedMediaFeature) chromedp.ActionFunc {
+func emulateMediaTypeActionFunc(logger *slog.Logger, mediaType string, mediaFeatures []EmulatedMediaFeature) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		if mediaType == "" && len(mediaFeatures) == 0 {
-			logger.Debug("no emulated media type or features")
+			logger.DebugContext(ctx, "no emulated media type or features")
 			return nil
 		}
 
@@ -437,12 +443,12 @@ func emulateMediaTypeActionFunc(logger *zap.Logger, mediaType string, mediaFeatu
 		emulatedMedia := emulation.SetEmulatedMedia()
 
 		if mediaType != "" {
-			logger.Debug(fmt.Sprintf("emulate media type '%s'", mediaType))
+			logger.DebugContext(ctx, fmt.Sprintf("emulate media type '%s'", mediaType))
 			emulatedMedia = emulatedMedia.WithMedia(mediaType)
 		}
 
 		if len(mediaFeatures) > 0 {
-			logger.Debug(fmt.Sprintf("emulate media features %+v", mediaFeatures))
+			logger.DebugContext(ctx, fmt.Sprintf("emulate media features %+v", mediaFeatures))
 
 			features := make([]*emulation.MediaFeature, len(mediaFeatures))
 			for i, f := range mediaFeatures {
@@ -464,21 +470,21 @@ func emulateMediaTypeActionFunc(logger *zap.Logger, mediaType string, mediaFeatu
 	}
 }
 
-func waitDelayBeforePrintActionFunc(logger *zap.Logger, disableJavaScript bool, delay time.Duration) chromedp.ActionFunc {
+func waitDelayBeforePrintActionFunc(logger *slog.Logger, disableJavaScript bool, delay time.Duration) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		if disableJavaScript {
-			logger.Debug("JavaScript disabled, skipping wait delay")
+			logger.DebugContext(ctx, "JavaScript disabled, skipping wait delay")
 			return nil
 		}
 
 		if delay <= 0 {
-			logger.Debug("no wait delay")
+			logger.DebugContext(ctx, "no wait delay")
 			return nil
 		}
 
 		// We wait for a given amount of time so that JavaScript
 		// scripts have a chance to finish before printing the page.
-		logger.Debug(fmt.Sprintf("wait '%s' before print", delay))
+		logger.DebugContext(ctx, fmt.Sprintf("wait '%s' before print", delay))
 
 		select {
 		case <-ctx.Done():
@@ -489,21 +495,21 @@ func waitDelayBeforePrintActionFunc(logger *zap.Logger, disableJavaScript bool,
 	}
 }
 
-func waitForExpressionBeforePrintActionFunc(logger *zap.Logger, disableJavaScript bool, expression string) chromedp.ActionFunc {
+func waitForExpressionBeforePrintActionFunc(logger *slog.Logger, disableJavaScript bool, expression string) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		if disableJavaScript {
-			logger.Debug("JavaScript disabled, skipping wait expression")
+			logger.DebugContext(ctx, "JavaScript disabled, skipping wait expression")
 			return nil
 		}
 
 		if expression == "" {
-			logger.Debug("no wait expression")
+			logger.DebugContext(ctx, "no wait expression")
 			return nil
 		}
 
 		// We wait until the evaluation of the expression is true or
 		// until the context is done.
-		logger.Debug(fmt.Sprintf("wait until '%s' is true before print", expression))
+		logger.DebugContext(ctx, fmt.Sprintf("wait until '%s' is true before print", expression))
 		ticker := time.NewTicker(time.Duration(100) * time.Millisecond)
 
 		for {
@@ -531,14 +537,14 @@ func waitForExpressionBeforePrintActionFunc(logger *zap.Logger, disableJavaScrip
 	}
 }
 
-func waitForSelectorVisibleBeforePrintActionFunc(logger *zap.Logger, selector string) chromedp.ActionFunc {
+func waitForSelectorVisibleBeforePrintActionFunc(logger *slog.Logger, selector string) chromedp.ActionFunc {
 	return func(ctx context.Context) error {
 		if selector == "" {
-			logger.Debug("no wait selector")
+			logger.DebugContext(ctx, "no wait selector")
 			return nil
 		}
 
-		logger.Debug(fmt.Sprintf("wait until '%s' is visible before print", selector))
+		logger.DebugContext(ctx, fmt.Sprintf("wait until '%s' is visible before print", selector))
 		err := chromedp.WaitVisible(selector, chromedp.ByQuery, chromedp.RetryInterval(time.Duration(100)*time.Millisecond)).Do(ctx)
 		if err != nil {
 			return fmt.Errorf("wait visible: %v: %w", err, ErrInvalidSelectorQuery)

pkg/modules/exiftool/exiftool.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"os"
 	"os/exec"
 	"reflect"
@@ -11,7 +12,8 @@ import (
 	"syscall"
 
 	"github.com/barasher/go-exiftool"
-	"go.uber.org/zap"
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/trace"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
@@ -74,64 +76,118 @@ func (engine *ExifTool) Debug() map[string]any {
 }
 
 // Merge is not available in this implementation.
-func (engine *ExifTool) Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+func (engine *ExifTool) Merge(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
-	return fmt.Errorf("merge PDFs with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "ExifTool.Merge", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("merge PDFs with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
 // Split is not available in this implementation.
-func (engine *ExifTool) Split(ctx context.Context, logger *zap.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+func (engine *ExifTool) Split(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
-	return nil, fmt.Errorf("split PDF with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "ExifTool.Split", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("split PDF with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return nil, err
 }
 
 // Flatten is not available in this implementation.
-func (engine *ExifTool) Flatten(ctx context.Context, logger *zap.Logger, inputPath string) error {
+func (engine *ExifTool) Flatten(ctx context.Context, logger *slog.Logger, inputPath string) error {
-	return fmt.Errorf("flatten PDF with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "ExifTool.Flatten", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("flatten PDF with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
 // Convert is not available in this implementation.
-func (engine *ExifTool) Convert(ctx context.Context, logger *zap.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+func (engine *ExifTool) Convert(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
-	return fmt.Errorf("convert PDF to '%+v' with ExifTool: %w", formats, gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "ExifTool.Convert", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("convert PDF to '%+v' with ExifTool: %w", formats, gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
 // ReadMetadata extracts the metadata of a given PDF file.
-func (engine *ExifTool) ReadMetadata(ctx context.Context, logger *zap.Logger, inputPath string) (map[string]any, error) {
+func (engine *ExifTool) ReadMetadata(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
+	_, span := gotenberg.Tracer().Start(ctx, "ExifTool.ReadMetadata", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	exifTool, err := exiftool.NewExiftool(exiftool.SetExiftoolBinaryPath(engine.binPath))
 	if err != nil {
-		return nil, fmt.Errorf("new ExifTool: %w", err)
+		err = fmt.Errorf("new ExifTool: %w", err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return nil, err
 	}
 
 	defer func(exifTool *exiftool.Exiftool) {
 		err := exifTool.Close()
 		if err != nil {
-			logger.Error(fmt.Sprintf("close ExifTool: %v", err))
+			logger.ErrorContext(ctx, fmt.Sprintf("close ExifTool: %v", err))
 		}
 	}(exifTool)
 
 	fileMetadata := exifTool.ExtractMetadata(inputPath)
 	if fileMetadata[0].Err != nil {
-		return nil, fmt.Errorf("read metadata with ExitfTool: %w", fileMetadata[0].Err)
+		err = fmt.Errorf("read metadata with ExitfTool: %w", fileMetadata[0].Err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return nil, err
 	}
 
 	return fileMetadata[0].Fields, nil
 }
 
 // WriteMetadata writes the metadata into a given PDF file.
-func (engine *ExifTool) WriteMetadata(ctx context.Context, logger *zap.Logger, metadata map[string]any, inputPath string) error {
+func (engine *ExifTool) WriteMetadata(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
+	_, span := gotenberg.Tracer().Start(ctx, "ExifTool.WriteMetadata", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	exifTool, err := exiftool.NewExiftool(exiftool.SetExiftoolBinaryPath(engine.binPath))
 	if err != nil {
-		return fmt.Errorf("new ExifTool: %w", err)
+		err = fmt.Errorf("new ExifTool: %w", err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return err
 	}
 
 	defer func(exifTool *exiftool.Exiftool) {
 		err := exifTool.Close()
 		if err != nil {
-			logger.Error(fmt.Sprintf("close ExifTool: %v", err))
+			logger.ErrorContext(ctx, fmt.Sprintf("close ExifTool: %v", err))
 		}
 	}(exifTool)
 
 	fileMetadata := exifTool.ExtractMetadata(inputPath)
 	if fileMetadata[0].Err != nil {
-		return fmt.Errorf("read metadata with ExitfTool: %w", fileMetadata[0].Err)
+		err = fmt.Errorf("read metadata with ExitfTool: %w", fileMetadata[0].Err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return err
 	}
 
 	// Define a list of derived, system, or computed tags that ExifTool
@@ -175,7 +231,10 @@ func (engine *ExifTool) WriteMetadata(ctx context.Context, logger *zap.Logger, m
 					strs[i] = str
 					continue
 				}
-				return fmt.Errorf("write PDF metadata with ExifTool: %s %+v %s %w", key, val, reflect.TypeFor[[]any](), gotenberg.ErrPdfEngineMetadataValueNotSupported)
+				err = fmt.Errorf("write PDF metadata with ExifTool: %s %+v %s %w", key, val, reflect.TypeFor[[]any](), gotenberg.ErrPdfEngineMetadataValueNotSupported)
+				span.RecordError(err)
+				span.SetStatus(codes.Error, err.Error())
+				return err
 			}
 			fileMetadata[0].SetStrings(key, strs)
 		case bool:
@@ -191,82 +250,50 @@ func (engine *ExifTool) WriteMetadata(ctx context.Context, logger *zap.Logger, m
 		// TODO: support more complex cases, e.g., arrays and nested objects
 		// 	(limitations in underlying library).
 		default:
-			return fmt.Errorf("write PDF metadata with ExifTool: %s %+v %s %w", key, val, reflect.TypeOf(val), gotenberg.ErrPdfEngineMetadataValueNotSupported)
+			err = fmt.Errorf("write PDF metadata with ExifTool: %s %+v %s %w", key, val, reflect.TypeOf(val), gotenberg.ErrPdfEngineMetadataValueNotSupported)
+			span.RecordError(err)
+			span.SetStatus(codes.Error, err.Error())
+			return err
 		}
 	}
 
 	exifTool.WriteMetadata(fileMetadata)
 	if fileMetadata[0].Err != nil {
-		return fmt.Errorf("write PDF metadata with ExifTool: %w", fileMetadata[0].Err)
+		err = fmt.Errorf("write PDF metadata with ExifTool: %w", fileMetadata[0].Err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return err
 	}
 
 	return nil
 }
 
-// PageCount returns the number of pages in a PDF file using ExifTool.
-func (engine *ExifTool) PageCount(ctx context.Context, logger *zap.Logger, inputPath string) (int, error) {
-	metadata, err := engine.ReadMetadata(ctx, logger, inputPath)
-	if err != nil {
-		return 0, fmt.Errorf("read metadata with ExifTool: %w", err)
-	}
-
-	pageCountValue, ok := metadata["PageCount"]
-	if !ok {
-		return 0, errors.New("PageCount not found in metadata")
-	}
-
-	switch val := pageCountValue.(type) {
-	case int:
-		return val, nil
-	case int64:
-		return int(val), nil
-	case float64:
-		return int(val), nil
-	case string:
-		var res int
-		_, err := fmt.Sscanf(val, "%d", &res)
-		if err != nil {
-			return 0, fmt.Errorf("parse PageCount string '%s': %w", val, err)
-		}
-		return res, nil
-	default:
-		return 0, fmt.Errorf("unexpected PageCount type '%T'", pageCountValue)
-	}
-}
-
-// WriteBookmarks is not available in this implementation.
-func (engine *ExifTool) WriteBookmarks(ctx context.Context, logger *zap.Logger, inputPath string, bookmarks []gotenberg.Bookmark) error {
-	return fmt.Errorf("write PDF bookmarks with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
-}
-
-// ReadBookmarks is not available in this implementation.
-func (engine *ExifTool) ReadBookmarks(ctx context.Context, logger *zap.Logger, inputPath string) ([]gotenberg.Bookmark, error) {
-	return nil, fmt.Errorf("read PDF bookmarks with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
-}
-
 // Encrypt is not available in this implementation.
-func (engine *ExifTool) Encrypt(ctx context.Context, logger *zap.Logger, inputPath, userPassword, ownerPassword string) error {
+func (engine *ExifTool) Encrypt(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
-	return fmt.Errorf("encrypt PDF using ExifTool: %w", gotenberg.ErrPdfEncryptionNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "ExifTool.Encrypt", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("encrypt PDF using ExifTool: %w", gotenberg.ErrPdfEncryptionNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
-// EmbedFiles is not available in this implementation.
+// AddAttachments is not available in this implementation.
-func (engine *ExifTool) EmbedFiles(ctx context.Context, logger *zap.Logger, filePaths []string, inputPath string) error {
+func (engine *ExifTool) AddAttachments(ctx context.Context, logger *slog.Logger, filePaths []string, inputPath string) error {
-	return fmt.Errorf("embed files with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "ExifTool.AddAttachments", trace.WithSpanKind(trace.SpanKindInternal))
-}
+	defer span.End()
 
-// Watermark is not available in this implementation.
+	err := fmt.Errorf("add attachments with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
-func (engine *ExifTool) Watermark(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
+	if err != nil {
-	return fmt.Errorf("watermark PDF with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+		span.RecordError(err)
-}
+		span.SetStatus(codes.Error, err.Error())
+	}
 
-// Stamp is not available in this implementation.
+	return err
-func (engine *ExifTool) Stamp(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
-	return fmt.Errorf("stamp PDF with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
-}
-
-// Rotate is not available in this implementation.
-func (engine *ExifTool) Rotate(ctx context.Context, logger *zap.Logger, inputPath string, angle int, pages string) error {
-	return fmt.Errorf("rotate PDF with ExifTool: %w", gotenberg.ErrPdfEngineMethodNotSupported)
 }
 
 // Interface guards.

pkg/modules/libreoffice/api/api.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"os"
 	"os/exec"
 	"strings"
@@ -12,8 +13,10 @@ import (
 
 	"github.com/alexliesenfeld/health"
 	flag "github.com/spf13/pflag"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/metric"
 	"go.uber.org/multierr"
-	"go.uber.org/zap"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 	"github.com/gotenberg/gotenberg/v8/pkg/modules/api"
@@ -45,9 +48,15 @@ type Api struct {
 	autoStart bool
 	args      libreOfficeArguments
 
-	logger      *zap.Logger
+	logger      *slog.Logger
 	libreOffice libreOffice
 	supervisor  gotenberg.ProcessSupervisor
+
+	reqsCounter               metric.Int64Counter
+	errsCounter               metric.Int64Counter
+	conversionDurationCounter metric.Float64Histogram
+	queueWaitDurationCounter  metric.Float64Histogram
+	pdfOutputSizeCounter      metric.Int64Histogram
 }
 
 // Options gathers available options when converting a document to PDF.
@@ -147,29 +156,6 @@ type Options struct {
 	// Possible values are: 75, 150, 300, 600 and 1200.
 	MaxImageResolution int
 
-	// NativeWatermarkText specifies the text for a watermark to be drawn on
-	// every page of the exported PDF file.
-	// See https://help.libreoffice.org/latest/en-US/text/shared/guide/pdf_params.html.
-	NativeWatermarkText string
-
-	// NativeWatermarkColor specifies the color for the watermark text as a
-	// decimal long value. Default is 8388223 (light green).
-	NativeWatermarkColor int
-
-	// NativeWatermarkFontHeight specifies the font size for the watermark text.
-	NativeWatermarkFontHeight int
-
-	// NativeWatermarkRotateAngle specifies the rotation angle for the watermark
-	// text in tenths of a degree (e.g., 450 = 45°).
-	NativeWatermarkRotateAngle int
-
-	// NativeWatermarkFontName specifies the font name for the watermark text.
-	// Default is "Helvetica".
-	NativeWatermarkFontName string
-
-	// NativeTiledWatermarkText specifies the tiled watermark text.
-	NativeTiledWatermarkText string
-
 	// PdfFormats allows to convert the resulting PDF to PDF/A-1b, PDF/A-2b,
 	// PDF/A-3b and PDF/UA.
 	PdfFormats gotenberg.PdfFormats
@@ -201,12 +187,6 @@ func DefaultOptions() Options {
 		Quality:                         90,
 		ReduceImageResolution:           false,
 		MaxImageResolution:              300,
-		NativeWatermarkText:             "",
-		NativeWatermarkColor:            8388223,
-		NativeWatermarkFontHeight:       0,
-		NativeWatermarkRotateAngle:      0,
-		NativeWatermarkFontName:         "Helvetica",
-		NativeTiledWatermarkText:        "",
 		PdfFormats: gotenberg.PdfFormats{
 			PdfA:  "",
 			PdfUa: false,
@@ -216,7 +196,7 @@ func DefaultOptions() Options {
 
 // Uno is an abstraction on top of the Universal Network Objects API.
 type Uno interface {
-	Pdf(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error
+	Pdf(ctx context.Context, logger *slog.Logger, inputPath, outputPath string, options Options) error
 	Extensions() []string
 }
 
@@ -270,20 +250,103 @@ func (a *Api) Provision(ctx *gotenberg.Context) error {
 	}
 
 	// Logger.
-	loggerProvider, err := ctx.Module(new(gotenberg.LoggerProvider))
+	a.logger = gotenberg.Logger(a).With(slog.String("logger", "libreoffice"))
-	if err != nil {
-		return fmt.Errorf("get logger provider: %w", err)
-	}
-	logger, err := loggerProvider.(gotenberg.LoggerProvider).Logger(a)
-	if err != nil {
-		return fmt.Errorf("get logger: %w", err)
-	}
-	a.logger = logger.Named("libreoffice")
 
 	// Process.
 	a.libreOffice = newLibreOfficeProcess(a.args)
 	a.supervisor = gotenberg.NewProcessSupervisor(a.logger, a.libreOffice, flags.MustInt64("libreoffice-restart-after"), flags.MustInt64("libreoffice-max-queue-size"), 1)
 
+	// OpenTelemetry.
+	meter := gotenberg.Meter()
+	_, err := meter.Int64ObservableCounter(
+		"libreoffice.process.restarts.total",
+		metric.WithDescription("Current number of LibreOffice restarts."),
+		metric.WithUnit("{restart}"),
+		metric.WithInt64Callback(func(_ context.Context, o metric.Int64Observer) error {
+			val := a.supervisor.RestartsCount()
+			o.Observe(val)
+			return nil
+		}),
+	)
+	if err != nil {
+		return fmt.Errorf("create process restarts observable counter: %w", err)
+	}
+
+	_, err = meter.Int64ObservableGauge(
+		"libreoffice.requests.queue_size",
+		metric.WithDescription("Current number of LibreOffice conversion requests waiting to be treated."),
+		metric.WithUnit("{request}"),
+		metric.WithInt64Callback(func(_ context.Context, o metric.Int64Observer) error {
+			val := a.supervisor.ReqQueueSize()
+			o.Observe(val)
+			return nil
+		}),
+	)
+	if err != nil {
+		return fmt.Errorf("create requests queue size observable gauge: %w", err)
+	}
+
+	_, err = meter.Int64ObservableGauge(
+		"libreoffice.requests.active",
+		metric.WithDescription("Current number of LibreOffice conversion requests actively being processed."),
+		metric.WithUnit("{request}"),
+		metric.WithInt64Callback(func(_ context.Context, o metric.Int64Observer) error {
+			val := a.supervisor.ActiveTasksCount()
+			o.Observe(val)
+			return nil
+		}),
+	)
+	if err != nil {
+		return fmt.Errorf("create requests active observable gauge: %w", err)
+	}
+
+	a.reqsCounter, err = meter.Int64Counter(
+		"libreoffice.requests.total",
+		metric.WithDescription("Total number of LibreOffice conversion requests."),
+		metric.WithUnit("{request}"),
+	)
+	if err != nil {
+		return fmt.Errorf("create requests total counter: %w", err)
+	}
+
+	a.errsCounter, err = meter.Int64Counter(
+		"libreoffice.errors.total",
+		metric.WithDescription("Total number of LibreOffice errors."),
+		metric.WithUnit("{error}"),
+	)
+	if err != nil {
+		return fmt.Errorf("create errors total counter: %w", err)
+	}
+
+	a.conversionDurationCounter, err = meter.Float64Histogram(
+		"libreoffice.conversion.duration",
+		metric.WithDescription("Duration of each PDF conversion."),
+		metric.WithUnit("s"),
+		metric.WithExplicitBucketBoundaries(0.5, 1, 2, 5, 10, 30, 60),
+	)
+	if err != nil {
+		return fmt.Errorf("create conversion duration histogram: %w", err)
+	}
+
+	a.queueWaitDurationCounter, err = meter.Float64Histogram(
+		"libreoffice.queue.wait.duration",
+		metric.WithDescription("Time a request spends waiting in the queue before processing starts."),
+		metric.WithUnit("s"),
+		metric.WithExplicitBucketBoundaries(0.5, 1, 2, 5, 10, 30, 60),
+	)
+	if err != nil {
+		return fmt.Errorf("create queue wait duration histogram: %w", err)
+	}
+
+	a.pdfOutputSizeCounter, err = meter.Int64Histogram(
+		"libreoffice.pdf.output.size",
+		metric.WithDescription("Size of the generated PDF files."),
+		metric.WithUnit("By"),
+	)
+	if err != nil {
+		return fmt.Errorf("create pdf output size histogram: %w", err)
+	}
+
 	return nil
 }
 
@@ -332,7 +395,7 @@ func (a *Api) StartupMessage() string {
 func (a *Api) Stop(ctx context.Context) error {
 	// Block until the context is done so that another module may gracefully
 	// stop before we do a shutdown.
-	a.logger.Debug("wait for the end of grace duration")
+	a.logger.DebugContext(ctx, "wait for the end of grace duration")
 
 	<-ctx.Done()
 
@@ -361,26 +424,6 @@ func (a *Api) Debug() map[string]any {
 	return debug
 }
 
-// Metrics returns the metrics.
-func (a *Api) Metrics() ([]gotenberg.Metric, error) {
-	return []gotenberg.Metric{
-		{
-			Name:        "libreoffice_requests_queue_size",
-			Description: "Current number of LibreOffice conversion requests waiting to be treated.",
-			Read: func() float64 {
-				return float64(a.supervisor.ReqQueueSize())
-			},
-		},
-		{
-			Name:        "libreoffice_restarts_count",
-			Description: "Current number of LibreOffice restarts.",
-			Read: func() float64 {
-				return float64(a.supervisor.RestartsCount())
-			},
-		},
-	}, nil
-}
-
 // Checks adds a health check that verifies if LibreOffice is healthy.
 func (a *Api) Checks() ([]health.CheckerOption, error) {
 	return []health.CheckerOption{
@@ -431,22 +474,90 @@ func (a *Api) LibreOffice() (Uno, error) {
 }
 
 // Pdf converts a document to PDF.
-func (a *Api) Pdf(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error {
+func (a *Api) Pdf(ctx context.Context, logger *slog.Logger, inputPath, outputPath string, options Options) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "LibreOffice.Pdf")
+	defer span.End()
+
+	start := time.Now()
+	var conversionStart time.Time
+
 	err := a.supervisor.Run(ctx, logger, func() error {
+		conversionStart = time.Now()
 		return a.libreOffice.pdf(ctx, logger, inputPath, outputPath, options)
 	})
 
+	end := time.Now()
+
+	status := "success"
+	if err != nil {
+		if errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled) {
+			status = "timeout"
+		} else {
+			status = "error"
+		}
+	}
+
+	if !conversionStart.IsZero() {
+		waitDuration := conversionStart.Sub(start).Seconds()
+		conversionDuration := end.Sub(conversionStart).Seconds()
+
+		a.queueWaitDurationCounter.Record(ctx, waitDuration, metric.WithAttributes(
+			attribute.String("status", status),
+		))
+		a.conversionDurationCounter.Record(ctx, conversionDuration, metric.WithAttributes(
+			attribute.String("status", status),
+		))
+	} else {
+		waitDuration := end.Sub(start).Seconds()
+		a.queueWaitDurationCounter.Record(ctx, waitDuration, metric.WithAttributes(
+			attribute.String("status", status),
+		))
+	}
+
+	a.reqsCounter.Add(ctx, 1, metric.WithAttributes(
+		attribute.String("status", status),
+	))
+
 	if err == nil {
+		if fileInfo, statErr := os.Stat(outputPath); statErr == nil {
+			a.pdfOutputSizeCounter.Record(ctx, fileInfo.Size())
+		}
 		return nil
 	}
 
-	// See https://github.com/gotenberg/gotenberg/issues/639.
+	reason := "unknown"
-	if errors.Is(err, ErrCoreDumped) {
+	if errors.Is(err, context.DeadlineExceeded) {
-		logger.Debug(fmt.Sprintf("got a '%s' error, retry conversion", err))
+		reason = "timeout"
-		return a.Pdf(ctx, logger, inputPath, outputPath, options)
+	} else if errors.Is(err, context.Canceled) {
+		reason = "context_cancelled"
+	} else if errors.Is(err, ErrInvalidPdfFormats) {
+		reason = "invalid_input"
+	} else if errors.Is(err, gotenberg.ErrMaximumQueueSizeExceeded) {
+		reason = "libreoffice_maximum_queue_size_exceeded"
+	} else if errors.Is(err, gotenberg.ErrProcessAlreadyRestarting) {
+		reason = "libreoffice_unavailable"
 	}
 
-	return fmt.Errorf("supervisor run task: %w", err)
+	a.errsCounter.Add(ctx, 1, metric.WithAttributes(
+		attribute.String("reason", reason),
+	))
+
+	// See https://github.com/gotenberg/gotenberg/issues/639.
+	if errors.Is(err, ErrCoreDumped) {
+		logger.DebugContext(ctx, fmt.Sprintf("got a '%s' error, retry conversion", err))
+		err = a.Pdf(ctx, logger, inputPath, outputPath, options)
+		if err != nil {
+			span.RecordError(err)
+			span.SetStatus(codes.Error, err.Error())
+		}
+		return err
+	}
+
+	err = fmt.Errorf("supervisor run task: %w", err)
+	span.RecordError(err)
+	span.SetStatus(codes.Error, err.Error())
+
+	return err
 }
 
 // Extensions returns the file extensions available for conversions.
@@ -588,13 +699,12 @@ func (a *Api) Extensions() []string {
 
 // Interface guards.
 var (
-	_ gotenberg.Module          = (*Api)(nil)
+	_ gotenberg.Module      = (*Api)(nil)
-	_ gotenberg.Provisioner     = (*Api)(nil)
+	_ gotenberg.Provisioner = (*Api)(nil)
-	_ gotenberg.Validator       = (*Api)(nil)
+	_ gotenberg.Validator   = (*Api)(nil)
-	_ gotenberg.App             = (*Api)(nil)
+	_ gotenberg.App         = (*Api)(nil)
-	_ gotenberg.Debuggable      = (*Api)(nil)
+	_ gotenberg.Debuggable  = (*Api)(nil)
-	_ gotenberg.MetricsProvider = (*Api)(nil)
+	_ api.HealthChecker     = (*Api)(nil)
-	_ api.HealthChecker         = (*Api)(nil)
+	_ Uno                   = (*Api)(nil)
-	_ Uno                       = (*Api)(nil)
+	_ Provider              = (*Api)(nil)
-	_ Provider                  = (*Api)(nil)
 )

pkg/modules/libreoffice/api/freeport.go

@@ -1,14 +1,14 @@
 package api
 
 import (
+	"context"
 	"fmt"
+	"log/slog"
 	"net"
 	"strconv"
-
-	"go.uber.org/zap"
 )
 
-func freePort(logger *zap.Logger) (int, error) {
+func freePort(logger *slog.Logger) (int, error) {
 	netListener, err := net.Listen("tcp", "127.0.0.1:0")
 	if err != nil {
 		return 0, fmt.Errorf("listen on the local network address: %w", err)
@@ -16,7 +16,7 @@ func freePort(logger *zap.Logger) (int, error) {
 	defer func() {
 		err := netListener.Close()
 		if err != nil {
-			logger.Error(fmt.Sprintf("close network listener: %s", err.Error()))
+			logger.ErrorContext(context.Background(), fmt.Sprintf("close network listener: %s", err.Error()))
 		}
 	}()
 

pkg/modules/libreoffice/api/libreoffice.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"net"
 	"os"
 	"strings"
@@ -11,14 +12,17 @@ import (
 	"sync/atomic"
 	"time"
 
-	"go.uber.org/zap"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
+	semconv "go.opentelemetry.io/otel/semconv/v1.39.0"
+	"go.opentelemetry.io/otel/trace"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
 
 type libreOffice interface {
 	gotenberg.Process
-	pdf(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error
+	pdf(ctx context.Context, logger *slog.Logger, inputPath, outputPath string, options Options) error
 }
 
 type libreOfficeArguments struct {
@@ -48,7 +52,7 @@ func newLibreOfficeProcess(arguments libreOfficeArguments) libreOffice {
 	return p
 }
 
-func (p *libreOfficeProcess) Start(logger *zap.Logger) error {
+func (p *libreOfficeProcess) Start(logger *slog.Logger) error {
 	if p.isStarted.Load() {
 		return errors.New("LibreOffice is already started")
 	}
@@ -86,7 +90,7 @@ func (p *libreOfficeProcess) Start(logger *zap.Logger) error {
 		return fmt.Errorf("execute LibreOffice: %w", err)
 	}
 
-	logger.Debug("got exit code 81, e.g., LibreOffice first start")
+	logger.DebugContext(ctx, "got exit code 81, e.g., LibreOffice first start")
 
 	// Second start (daemon).
 	cmd = gotenberg.Command(logger, p.arguments.binPath, args...)
@@ -123,7 +127,7 @@ func (p *libreOfficeProcess) Start(logger *zap.Logger) error {
 			connChan <- nil
 			err = conn.Close()
 			if err != nil {
-				logger.Debug(fmt.Sprintf("close connection after health checking the LibreOffice: %v", err))
+				logger.DebugContext(ctx, fmt.Sprintf("close connection after health checking the LibreOffice: %v", err))
 			}
 
 			break
@@ -148,19 +152,19 @@ func (p *libreOfficeProcess) Start(logger *zap.Logger) error {
 		// Let's make sure the process is killed.
 		err = cmd.Kill()
 		if err != nil {
-			logger.Debug(fmt.Sprintf("kill LibreOffice process: %v", err))
+			logger.DebugContext(context.Background(), fmt.Sprintf("kill LibreOffice process: %v", err))
 		}
 
 		// And the user profile directory is deleted.
 		err = os.RemoveAll(userProfileDirPath)
 		if err != nil {
-			logger.Error(fmt.Sprintf("remove LibreOffice's user profile directory: %v", err))
+			logger.ErrorContext(context.Background(), fmt.Sprintf("remove LibreOffice's user profile directory: %v", err))
 		}
 
-		logger.Debug(fmt.Sprintf("'%s' LibreOffice's user profile directory removed", userProfileDirPath))
+		logger.DebugContext(context.Background(), fmt.Sprintf("'%s' LibreOffice's user profile directory removed", userProfileDirPath))
 	}()
 
-	logger.Debug("waiting for the LibreOffice socket to be available...")
+	logger.DebugContext(ctx, "waiting for the LibreOffice socket to be available...")
 
 	for {
 		select {
@@ -169,7 +173,7 @@ func (p *libreOfficeProcess) Start(logger *zap.Logger) error {
 				return fmt.Errorf("LibreOffice socket not available: %w", err)
 			}
 
-			logger.Debug("LibreOffice socket available")
+			logger.DebugContext(ctx, "LibreOffice socket available")
 			success = true
 
 			return nil
@@ -179,7 +183,7 @@ func (p *libreOfficeProcess) Start(logger *zap.Logger) error {
 	}
 }
 
-func (p *libreOfficeProcess) Stop(logger *zap.Logger) error {
+func (p *libreOfficeProcess) Stop(logger *slog.Logger) error {
 	if !p.isStarted.Load() {
 		// No big deal? Like calling cancel twice.
 		return nil
@@ -192,15 +196,15 @@ func (p *libreOfficeProcess) Stop(logger *zap.Logger) error {
 		go func() {
 			err := os.RemoveAll(userProfileDirPath)
 			if err != nil {
-				logger.Error(fmt.Sprintf("remove LibreOffice's user profile directory: %v", err))
+				logger.ErrorContext(context.Background(), fmt.Sprintf("remove LibreOffice's user profile directory: %v", err))
 			} else {
-				logger.Debug(fmt.Sprintf("'%s' LibreOffice's user profile directory removed", userProfileDirPath))
+				logger.DebugContext(context.Background(), fmt.Sprintf("'%s' LibreOffice's user profile directory removed", userProfileDirPath))
 			}
 
 			// Also, remove LibreOffice specific files in the temporary directory.
-			err = gotenberg.GarbageCollect(logger, os.TempDir(), []string{"OSL_PIPE", ".tmp"}, expirationTime)
+			err = gotenberg.GarbageCollect(context.Background(), logger, os.TempDir(), []string{"OSL_PIPE", ".tmp"}, expirationTime)
 			if err != nil {
-				logger.Error(err.Error())
+				logger.ErrorContext(context.Background(), err.Error())
 			}
 		}()
 	}(copyUserProfileDirPath, expirationTime)
@@ -221,7 +225,7 @@ func (p *libreOfficeProcess) Stop(logger *zap.Logger) error {
 	return nil
 }
 
-func (p *libreOfficeProcess) Healthy(logger *zap.Logger) bool {
+func (p *libreOfficeProcess) Healthy(logger *slog.Logger) bool {
 	// Good to know: the supervisor does not call this method if no first start
 	// or if the process is restarting.
 
@@ -237,7 +241,7 @@ func (p *libreOfficeProcess) Healthy(logger *zap.Logger) bool {
 	if err == nil {
 		err = conn.Close()
 		if err != nil {
-			logger.Debug(fmt.Sprintf("close connection after health checking LibreOffice: %v", err))
+			logger.DebugContext(context.Background(), fmt.Sprintf("close connection after health checking LibreOffice: %v", err))
 		}
 
 		return true
@@ -246,7 +250,7 @@ func (p *libreOfficeProcess) Healthy(logger *zap.Logger) bool {
 	return false
 }
 
-func (p *libreOfficeProcess) pdf(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error {
+func (p *libreOfficeProcess) pdf(ctx context.Context, logger *slog.Logger, inputPath, outputPath string, options Options) error {
 	if !p.isStarted.Load() {
 		return errors.New("LibreOffice not started, cannot handle PDF conversion")
 	}
@@ -259,8 +263,7 @@ func (p *libreOfficeProcess) pdf(ctx context.Context, logger *zap.Logger, inputP
 
 	args = append(args, "--port", fmt.Sprintf("%d", p.socketPort))
 
-	checkedEntry := logger.Check(zap.DebugLevel, "check for debug level before setting high verbosity")
+	if logger.Enabled(ctx, slog.LevelDebug) {
-	if checkedEntry != nil {
 		args = append(args, "-vvv")
 	}
 
@@ -302,38 +305,14 @@ func (p *libreOfficeProcess) pdf(ctx context.Context, logger *zap.Logger, inputP
 	args = append(args, "--export", fmt.Sprintf("ReduceImageResolution=%t", options.ReduceImageResolution))
 	args = append(args, "--export", fmt.Sprintf("MaxImageResolution=%d", options.MaxImageResolution))
 
-	if options.NativeWatermarkText != "" {
-		args = append(args, "--export", fmt.Sprintf("Watermark=%s", options.NativeWatermarkText))
-	}
-
-	if options.NativeWatermarkColor != 0 {
-		args = append(args, "--export", fmt.Sprintf("WatermarkColor=%d", options.NativeWatermarkColor))
-	}
-
-	if options.NativeWatermarkFontHeight > 0 {
-		args = append(args, "--export", fmt.Sprintf("WatermarkFontHeight=%d", options.NativeWatermarkFontHeight))
-	}
-
-	if options.NativeWatermarkRotateAngle != 0 {
-		args = append(args, "--export", fmt.Sprintf("WatermarkRotateAngle=%d", options.NativeWatermarkRotateAngle))
-	}
-
-	if options.NativeWatermarkFontName != "" && options.NativeWatermarkFontName != "Helvetica" {
-		args = append(args, "--export", fmt.Sprintf("WatermarkFontName=%s", options.NativeWatermarkFontName))
-	}
-
-	if options.NativeTiledWatermarkText != "" {
-		args = append(args, "--export", fmt.Sprintf("TiledWatermark=%s", options.NativeTiledWatermarkText))
-	}
-
 	switch options.PdfFormats.PdfA {
 	case "":
 	case gotenberg.PdfA1b:
-		args = append(args, "--export", "SelectPdfVersion=1", "--export", "EmbedStandardFonts=true")
+		args = append(args, "--export", "SelectPdfVersion=1")
 	case gotenberg.PdfA2b:
-		args = append(args, "--export", "SelectPdfVersion=2", "--export", "EmbedStandardFonts=true")
+		args = append(args, "--export", "SelectPdfVersion=2")
 	case gotenberg.PdfA3b:
-		args = append(args, "--export", "SelectPdfVersion=3", "--export", "EmbedStandardFonts=true")
+		args = append(args, "--export", "SelectPdfVersion=3")
 	default:
 		return ErrInvalidPdfFormats
 	}
@@ -344,7 +323,6 @@ func (p *libreOfficeProcess) pdf(ctx context.Context, logger *zap.Logger, inputP
 			"--export", "PDFUACompliance=true",
 			"--export", "UseTaggedPDF=true",
 			"--export", "EnableTextAccessForAccessibilityTools=true",
-			"--export", "EmbedStandardFonts=true",
 		)
 	} else {
 		args = append(
@@ -357,14 +335,35 @@ func (p *libreOfficeProcess) pdf(ctx context.Context, logger *zap.Logger, inputP
 
 	args = append(args, "--output", outputPath, inputPath)
 
-	cmd, err := gotenberg.CommandContext(ctx, logger, p.arguments.unoBinPath, args...)
+	p.cfgMu.RLock()
+	clientCtx, clientSpan := gotenberg.Tracer().Start(ctx, "uno.execute",
+		trace.WithSpanKind(trace.SpanKindClient),
+		trace.WithAttributes(
+			semconv.ServerAddress("127.0.0.1"),
+			semconv.ServerPort(p.socketPort),
+			semconv.ServicePeerName("libreoffice"),
+			// Legacy attribute for older APMs (Datadog, Jaeger) to draw the
+			// dependency graph.
+			attribute.String("peer.service", "libreoffice"),
+		),
+	)
+	p.cfgMu.RUnlock()
+
+	cmd, err := gotenberg.CommandContext(clientCtx, logger, p.arguments.unoBinPath, args...)
 	if err != nil {
 		return fmt.Errorf("create uno command: %w", err)
 	}
 
-	logger.Debug(fmt.Sprintf("print to PDF with: %+v", options))
+	logger.DebugContext(clientCtx, fmt.Sprintf("print to PDF with: %+v", options))
 
 	exitCode, err := cmd.Exec()
+	if err != nil {
+		clientSpan.RecordError(err)
+		clientSpan.SetStatus(codes.Error, err.Error())
+	}
+
+	clientSpan.End()
+
 	if err == nil {
 		return nil
 	}

pkg/modules/libreoffice/api/mocks.go

@@ -3,19 +3,18 @@ package api
 import (
 	"context"
 	"errors"
-
+	"log/slog"
-	"go.uber.org/zap"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
 
 // ApiMock is a mock for the [Uno] interface.
 type ApiMock struct {
-	PdfMock        func(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error
+	PdfMock        func(ctx context.Context, logger *slog.Logger, inputPath, outputPath string, options Options) error
 	ExtensionsMock func() []string
 }
 
-func (api *ApiMock) Pdf(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error {
+func (api *ApiMock) Pdf(ctx context.Context, logger *slog.Logger, inputPath, outputPath string, options Options) error {
 	return api.PdfMock(ctx, logger, inputPath, outputPath, options)
 }
 
@@ -37,10 +36,10 @@ type libreOfficeMock struct {
 	errCoreDumpedCount int
 
 	gotenberg.ProcessMock
-	pdfMock func(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error
+	pdfMock func(ctx context.Context, logger *slog.Logger, inputPath, outputPath string, options Options) error
 }
 
-func (b *libreOfficeMock) pdf(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error {
+func (b *libreOfficeMock) pdf(ctx context.Context, logger *slog.Logger, inputPath, outputPath string, options Options) error {
 	err := b.pdfMock(ctx, logger, inputPath, outputPath, options)
 	if errors.Is(err, ErrCoreDumped) {
 		b.errCoreDumpedCount += 1

pkg/modules/libreoffice/pdfengine/pdfengine.go

@@ -4,8 +4,10 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 
-	"go.uber.org/zap"
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/trace"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 	"github.com/gotenberg/gotenberg/v8/pkg/modules/libreoffice/api"
@@ -47,25 +49,55 @@ func (engine *LibreOfficePdfEngine) Provision(ctx *gotenberg.Context) error {
 }
 
 // Merge is not available in this implementation.
-func (engine *LibreOfficePdfEngine) Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+func (engine *LibreOfficePdfEngine) Merge(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
-	return fmt.Errorf("merge PDFs with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "LibreOfficePdfEngine.Merge", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("merge PDFs with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
 // Split is not available in this implementation.
-func (engine *LibreOfficePdfEngine) Split(ctx context.Context, logger *zap.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+func (engine *LibreOfficePdfEngine) Split(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
-	return nil, fmt.Errorf("split PDF with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "LibreOfficePdfEngine.Split", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("split PDF with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return nil, err
 }
 
 // Flatten is not available in this implementation.
-func (engine *LibreOfficePdfEngine) Flatten(ctx context.Context, logger *zap.Logger, inputPath string) error {
+func (engine *LibreOfficePdfEngine) Flatten(ctx context.Context, logger *slog.Logger, inputPath string) error {
-	return fmt.Errorf("flatten PDF with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "LibreOfficePdfEngine.Flatten", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("flatten PDF with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
 // Convert converts the given PDF to a specific PDF format. Currently, only the
 // PDF/A-1b, PDF/A-2b, PDF/A-3b and PDF/UA formats are available. If another
 // PDF format is requested, it returns a [gotenberg.ErrPdfFormatNotSupported]
 // error.
-func (engine *LibreOfficePdfEngine) Convert(ctx context.Context, logger *zap.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+func (engine *LibreOfficePdfEngine) Convert(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "LibreOfficePdfEngine.Convert", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	opts := api.DefaultOptions()
 	opts.PdfFormats = formats
 	err := engine.unoApi.Pdf(ctx, logger, inputPath, outputPath, opts)
@@ -75,60 +107,73 @@ func (engine *LibreOfficePdfEngine) Convert(ctx context.Context, logger *zap.Log
 	}
 
 	if errors.Is(err, api.ErrInvalidPdfFormats) {
-		return fmt.Errorf("convert PDF to '%+v' with LibreOffice: %w", formats, gotenberg.ErrPdfFormatNotSupported)
+		err = fmt.Errorf("convert PDF to '%+v' with LibreOffice: %w", formats, gotenberg.ErrPdfFormatNotSupported)
+	} else {
+		err = fmt.Errorf("convert PDF to '%+v' with LibreOffice: %w", formats, err)
 	}
 
-	return fmt.Errorf("convert PDF to '%+v' with LibreOffice: %w", formats, err)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
 // ReadMetadata is not available in this implementation.
-func (engine *LibreOfficePdfEngine) ReadMetadata(ctx context.Context, logger *zap.Logger, inputPath string) (map[string]any, error) {
+func (engine *LibreOfficePdfEngine) ReadMetadata(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
-	return nil, fmt.Errorf("read PDF metadata with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "LibreOfficePdfEngine.ReadMetadata", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("read PDF metadata with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return nil, err
 }
 
 // WriteMetadata is not available in this implementation.
-func (engine *LibreOfficePdfEngine) WriteMetadata(ctx context.Context, logger *zap.Logger, metadata map[string]any, inputPath string) error {
+func (engine *LibreOfficePdfEngine) WriteMetadata(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
-	return fmt.Errorf("write PDF metadata with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "LibreOfficePdfEngine.WriteMetadata", trace.WithSpanKind(trace.SpanKindInternal))
-}
+	defer span.End()
 
-// PageCount is not available in this implementation.
+	err := fmt.Errorf("write PDF metadata with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
-func (engine *LibreOfficePdfEngine) PageCount(ctx context.Context, logger *zap.Logger, inputPath string) (int, error) {
+	if err != nil {
-	return 0, fmt.Errorf("page count with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+		span.RecordError(err)
-}
+		span.SetStatus(codes.Error, err.Error())
+	}
 
-// WriteBookmarks is not available in this implementation.
+	return err
-func (engine *LibreOfficePdfEngine) WriteBookmarks(ctx context.Context, logger *zap.Logger, inputPath string, bookmarks []gotenberg.Bookmark) error {
-	return fmt.Errorf("write PDF bookmarks with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
-}
-
-// ReadBookmarks is not available in this implementation.
-func (engine *LibreOfficePdfEngine) ReadBookmarks(ctx context.Context, logger *zap.Logger, inputPath string) ([]gotenberg.Bookmark, error) {
-	return nil, fmt.Errorf("read PDF bookmarks with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
 }
 
 // Encrypt is not available in this implementation.
-func (engine *LibreOfficePdfEngine) Encrypt(ctx context.Context, logger *zap.Logger, inputPath, userPassword, ownerPassword string) error {
+func (engine *LibreOfficePdfEngine) Encrypt(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
-	return fmt.Errorf("encrypt PDF using LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "LibreOfficePdfEngine.Encrypt", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("encrypt PDF using LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
-// EmbedFiles is not available in this implementation.
+// AddAttachments is not available in this implementation.
-func (engine *LibreOfficePdfEngine) EmbedFiles(ctx context.Context, logger *zap.Logger, filePaths []string, inputPath string) error {
+func (engine *LibreOfficePdfEngine) AddAttachments(ctx context.Context, logger *slog.Logger, filePaths []string, inputPath string) error {
-	return fmt.Errorf("embed files with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "LibreOfficePdfEngine.AddAttachments", trace.WithSpanKind(trace.SpanKindInternal))
-}
+	defer span.End()
 
-// Watermark is not available in this implementation.
+	err := fmt.Errorf("add attachments with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
-func (engine *LibreOfficePdfEngine) Watermark(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
+	if err != nil {
-	return fmt.Errorf("watermark PDF with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+		span.RecordError(err)
-}
+		span.SetStatus(codes.Error, err.Error())
+	}
 
-// Stamp is not available in this implementation.
+	return err
-func (engine *LibreOfficePdfEngine) Stamp(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
-	return fmt.Errorf("stamp PDF with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
-}
-
-// Rotate is not available in this implementation.
-func (engine *LibreOfficePdfEngine) Rotate(ctx context.Context, logger *zap.Logger, inputPath string, angle int, pages string) error {
-	return fmt.Errorf("rotate PDF with LibreOffice: %w", gotenberg.ErrPdfEngineMethodNotSupported)
 }
 
 // Interface guards.

pkg/modules/libreoffice/routes.go

@@ -31,12 +31,7 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 			pdfFormats := pdfengines.FormDataPdfFormats(form)
 			metadata := pdfengines.FormDataPdfMetadata(form, false)
 			userPassword, ownerPassword := pdfengines.FormDataPdfEncrypt(form)
-			embedPaths := pdfengines.FormDataPdfEmbeds(form)
+			attachmentsPaths := pdfengines.FormDataPdfAttachments(form)
-			watermark := pdfengines.FormDataPdfWatermark(form, false)
-			watermarkFile := pdfengines.FormDataPdfWatermarkFile(form)
-			stamp := pdfengines.FormDataPdfStamp(form, false)
-			stampFile := pdfengines.FormDataPdfStampFile(form)
-			angle, rotatePages := pdfengines.FormDataPdfRotate(form, false)
 
 			zeroValuedSplitMode := gotenberg.SplitMode{}
 
@@ -65,12 +60,6 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 				quality                         int
 				reduceImageResolution           bool
 				maxImageResolution              int
-				nativeWatermarkText             string
-				nativeWatermarkColor            int
-				nativeWatermarkFontHeight       int
-				nativeWatermarkRotateAngle      int
-				nativeWatermarkFontName         string
-				nativeTiledWatermarkText        string
 				nativePdfFormats                bool
 				merge                           bool
 				flatten                         bool
@@ -139,48 +128,6 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 					maxImageResolution = intValue
 					return nil
 				}).
-				String("nativeWatermarkText", &nativeWatermarkText, defaultOptions.NativeWatermarkText).
-				Custom("nativeWatermarkColor", func(value string) error {
-					if value == "" {
-						nativeWatermarkColor = defaultOptions.NativeWatermarkColor
-						return nil
-					}
-					intValue, err := strconv.Atoi(value)
-					if err != nil {
-						return err
-					}
-					nativeWatermarkColor = intValue
-					return nil
-				}).
-				Custom("nativeWatermarkFontHeight", func(value string) error {
-					if value == "" {
-						nativeWatermarkFontHeight = defaultOptions.NativeWatermarkFontHeight
-						return nil
-					}
-					intValue, err := strconv.Atoi(value)
-					if err != nil {
-						return err
-					}
-					if intValue < 0 {
-						return errors.New("value is inferior to 0")
-					}
-					nativeWatermarkFontHeight = intValue
-					return nil
-				}).
-				Custom("nativeWatermarkRotateAngle", func(value string) error {
-					if value == "" {
-						nativeWatermarkRotateAngle = defaultOptions.NativeWatermarkRotateAngle
-						return nil
-					}
-					intValue, err := strconv.Atoi(value)
-					if err != nil {
-						return err
-					}
-					nativeWatermarkRotateAngle = intValue
-					return nil
-				}).
-				String("nativeWatermarkFontName", &nativeWatermarkFontName, defaultOptions.NativeWatermarkFontName).
-				String("nativeTiledWatermarkText", &nativeTiledWatermarkText, defaultOptions.NativeTiledWatermarkText).
 				Bool("nativePdfFormats", &nativePdfFormats, true).
 				Bool("merge", &merge, false).
 				Bool("flatten", &flatten, false).
@@ -189,21 +136,6 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 				return fmt.Errorf("validate form data: %w", err)
 			}
 
-			if (watermark.Source == gotenberg.StampSourceImage || watermark.Source == gotenberg.StampSourcePDF) && watermarkFile != "" {
-				watermark.Expression = watermarkFile
-			}
-			if (stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF) && stampFile != "" {
-				stamp.Expression = stampFile
-			}
-
-			err = pdfengines.ValidatePdfFormatsCompat(pdfFormats, userPassword, embedPaths)
-			if err != nil {
-				return err
-			}
-
-			hasPostProcessing := watermark.Source != "" || stamp.Source != "" || angle != 0 ||
-				len(embedPaths) > 0 || len(metadata) > 0 || flatten
-
 			outputPaths := make([]string, len(inputPaths))
 			for i, inputPath := range inputPaths {
 				outputPaths[i] = ctx.GeneratePath(".pdf")
@@ -231,18 +163,11 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 					Quality:                         quality,
 					ReduceImageResolution:           reduceImageResolution,
 					MaxImageResolution:              maxImageResolution,
-					NativeWatermarkText:             nativeWatermarkText,
-					NativeWatermarkColor:            nativeWatermarkColor,
-					NativeWatermarkFontHeight:       nativeWatermarkFontHeight,
-					NativeWatermarkRotateAngle:      nativeWatermarkRotateAngle,
-					NativeWatermarkFontName:         nativeWatermarkFontName,
-					NativeTiledWatermarkText:        nativeTiledWatermarkText,
 				}
 
-				if nativePdfFormats && splitMode == zeroValuedSplitMode && !hasPostProcessing {
+				if nativePdfFormats && splitMode == zeroValuedSplitMode {
 					// Only natively apply given PDF formats if we're not
-					// splitting the PDF later and no post-processing features
+					// splitting the PDF later.
-					// are enabled (as they would degrade compliance).
 					options.PdfFormats = pdfFormats
 				}
 
@@ -308,32 +233,7 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 				}
 			}
 
-			err = pdfengines.WatermarkStub(ctx, engine, watermark, outputPaths)
+			if !nativePdfFormats || (nativePdfFormats && splitMode != zeroValuedSplitMode) {
-			if err != nil {
-				return fmt.Errorf("watermark PDFs: %w", err)
-			}
-
-			err = pdfengines.StampStub(ctx, engine, stamp, outputPaths)
-			if err != nil {
-				return fmt.Errorf("stamp PDFs: %w", err)
-			}
-
-			err = pdfengines.RotateStub(ctx, engine, angle, rotatePages, outputPaths)
-			if err != nil {
-				return fmt.Errorf("rotate PDFs: %w", err)
-			}
-
-			if flatten {
-				err = pdfengines.FlattenStub(ctx, engine, outputPaths)
-				if err != nil {
-					return fmt.Errorf("flatten PDFs: %w", err)
-				}
-			}
-
-			needsConvertStub := !nativePdfFormats ||
-				(nativePdfFormats && splitMode != zeroValuedSplitMode) ||
-				(nativePdfFormats && hasPostProcessing)
-			if needsConvertStub {
 				convertOutputPaths, err := pdfengines.ConvertStub(ctx, engine, pdfFormats, outputPaths)
 				if err != nil {
 					return fmt.Errorf("convert PDFs: %w", err)
@@ -353,16 +253,21 @@ func convertRoute(libreOffice libreofficeapi.Uno, engine gotenberg.PdfEngine) ap
 				}
 			}
 
-			// Metadata, embeds are written after Convert, as LibreOffice
+			err = pdfengines.AddAttachmentsStub(ctx, engine, attachmentsPaths, outputPaths)
-			// strips them during PDF/A conversion.
+			if err != nil {
+				return fmt.Errorf("add attachments into PDFs: %w", err)
+			}
+
 			err = pdfengines.WriteMetadataStub(ctx, engine, metadata, outputPaths)
 			if err != nil {
 				return fmt.Errorf("write metadata: %w", err)
 			}
 
-			err = pdfengines.EmbedFilesStub(ctx, engine, embedPaths, outputPaths)
+			if flatten {
-			if err != nil {
+				err = pdfengines.FlattenStub(ctx, engine, outputPaths)
-				return fmt.Errorf("embed files into PDFs: %w", err)
+				if err != nil {
+					return fmt.Errorf("flatten PDFs: %w", err)
+				}
 			}
 
 			err = pdfengines.EncryptPdfStub(ctx, engine, userPassword, ownerPassword, outputPaths)

pkg/modules/logging/doc.go

@@ -1,3 +0,0 @@
-// Package logging provides a module which creates a zap.Logger instance for
-// other modules.
-package logging

pkg/modules/logging/gcp.go

@@ -1,36 +0,0 @@
-package logging
-
-import "go.uber.org/zap/zapcore"
-
-func gcpSeverity(l zapcore.Level) string {
-	switch l {
-	case zapcore.DebugLevel:
-		return "DEBUG"
-	case zapcore.InfoLevel:
-		return "INFO"
-	case zapcore.WarnLevel:
-		return "WARNING"
-	case zapcore.ErrorLevel:
-		return "ERROR"
-	case zapcore.DPanicLevel:
-		return "CRITICAL"
-	case zapcore.PanicLevel:
-		return "ALERT"
-	case zapcore.FatalLevel:
-		return "EMERGENCY"
-	case zapcore.InvalidLevel:
-		return "DEFAULT"
-	default:
-		return "DEFAULT"
-	}
-}
-
-func gcpSeverityEncoder(l zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
-	enc.AppendString(gcpSeverity(l))
-}
-
-func gcpSeverityColorEncoder(l zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
-	severity := gcpSeverity(l)
-	c := levelToColor(l)
-	enc.AppendString(c.Add(severity))
-}

pkg/modules/logging/logging.go

@@ -1,239 +0,0 @@
-package logging
-
-import (
-	"fmt"
-	"os"
-	"time"
-
-	flag "github.com/spf13/pflag"
-	"go.uber.org/multierr"
-	"go.uber.org/zap"
-	"go.uber.org/zap/zapcore"
-	"golang.org/x/term"
-
-	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
-)
-
-func init() {
-	gotenberg.MustRegisterModule(new(Logging))
-}
-
-const (
-	errorLoggingLevel = "error"
-	warnLoggingLevel  = "warn"
-	infoLoggingLevel  = "info"
-	debugLoggingLevel = "debug"
-)
-
-const (
-	autoLoggingFormat = "auto"
-	jsonLoggingFormat = "json"
-	textLoggingFormat = "text"
-)
-
-// Logging is a module that implements the [gotenberg.LoggerProvider]
-// interface.
-type Logging struct {
-	level           string
-	format          string
-	fieldsPrefix    string
-	enableGcpFields bool
-}
-
-// Descriptor returns a [Logging]'s module descriptor.
-func (log *Logging) Descriptor() gotenberg.ModuleDescriptor {
-	return gotenberg.ModuleDescriptor{
-		ID: "logging",
-		FlagSet: func() *flag.FlagSet {
-			fs := flag.NewFlagSet("logging", flag.ExitOnError)
-			fs.String("log-level", infoLoggingLevel, fmt.Sprintf("Choose the level of logging detail. Options include %s, %s, %s, or %s", errorLoggingLevel, warnLoggingLevel, infoLoggingLevel, debugLoggingLevel))
-			fs.String("log-format", autoLoggingFormat, fmt.Sprintf("Specify the format of logging. Options include %s, %s, or %s", autoLoggingFormat, jsonLoggingFormat, textLoggingFormat))
-			fs.String("log-fields-prefix", "", "Prepend a specified prefix to each field in the logs")
-			fs.Bool("log-enable-gcp-fields", false, "Enable Google Cloud Platform fields - namely: time, message, severity")
-
-			// Deprecated flags.
-			fs.Bool("log-enable-gcp-severity", false, "Enable Google Cloud Platform severity mapping")
-			err := fs.MarkDeprecated("log-enable-gcp-severity", "use log-enable-gcp-fields instead")
-			if err != nil {
-				panic(err)
-			}
-
-			return fs
-		}(),
-		New: func() gotenberg.Module { return new(Logging) },
-	}
-}
-
-// Provision sets the log level and format.
-func (log *Logging) Provision(ctx *gotenberg.Context) error {
-	flags := ctx.ParsedFlags()
-
-	log.level = flags.MustString("log-level")
-	log.format = flags.MustString("log-format")
-	log.fieldsPrefix = flags.MustString("log-fields-prefix")
-	log.enableGcpFields = flags.MustDeprecatedBool("log-enable-gcp-severity", "log-enable-gcp-fields")
-
-	return nil
-}
-
-// Validate validates the log level and format.
-func (log *Logging) Validate() error {
-	var err error
-
-	switch log.level {
-	case errorLoggingLevel, warnLoggingLevel, infoLoggingLevel, debugLoggingLevel:
-		break
-	default:
-		err = multierr.Append(
-			err,
-			fmt.Errorf("log level must be either %s, %s, %s or %s", errorLoggingLevel, warnLoggingLevel, infoLoggingLevel, debugLoggingLevel),
-		)
-	}
-
-	switch log.format {
-	case autoLoggingFormat, jsonLoggingFormat, textLoggingFormat:
-		break
-	default:
-		err = multierr.Append(
-			err,
-			fmt.Errorf("log format must be either %s, %s or %s", autoLoggingFormat, jsonLoggingFormat, textLoggingFormat),
-		)
-	}
-
-	return err
-}
-
-// Logger returns a [zap.Logger].
-func (log *Logging) Logger(mod gotenberg.Module) (*zap.Logger, error) {
-	if logger == nil {
-		lvl, err := newLogLevel(log.level)
-		if err != nil {
-			return nil, fmt.Errorf("get log level: %w", err)
-		}
-
-		encoder, err := newLogEncoder(log.format, log.enableGcpFields)
-		if err != nil {
-			return nil, fmt.Errorf("get log encoder: %w", err)
-		}
-
-		logger = zap.New(customCore{
-			Core:         zapcore.NewCore(encoder, os.Stderr, lvl),
-			fieldsPrefix: log.fieldsPrefix,
-		})
-	}
-
-	return logger.Named(mod.Descriptor().ID), nil
-}
-
-// See https://github.com/gotenberg/gotenberg/issues/659.
-type customCore struct {
-	zapcore.Core
-	fieldsPrefix string
-}
-
-func (c customCore) With(fields []zapcore.Field) zapcore.Core {
-	if c.fieldsPrefix != "" {
-		for i := range fields {
-			fields[i].Key = c.fieldsPrefix + "_" + fields[i].Key
-		}
-	}
-
-	return customCore{
-		Core:         c.Core.With(fields),
-		fieldsPrefix: c.fieldsPrefix,
-	}
-}
-
-func (c customCore) Check(ent zapcore.Entry, ce *zapcore.CheckedEntry) *zapcore.CheckedEntry {
-	// This is a copy from the zapcore.ioCore implementation. Indeed, by doing
-	// so, we are able to prefix the fields given to the logger methods like
-	// Debug, Info, Warn, Error, etc.
-	if c.Enabled(ent.Level) {
-		return ce.AddCore(ent, c)
-	}
-
-	return ce
-}
-
-func (c customCore) Write(entry zapcore.Entry, fields []zapcore.Field) error {
-	if c.fieldsPrefix != "" {
-		for i := range fields {
-			fields[i].Key = c.fieldsPrefix + "_" + fields[i].Key
-		}
-	}
-
-	return c.Core.Write(entry, fields)
-}
-
-func newLogLevel(level string) (zapcore.Level, error) {
-	lvl := zapcore.InvalidLevel
-
-	err := lvl.UnmarshalText([]byte(level))
-	if err != nil {
-		return lvl, fmt.Errorf("%q is not a recognized log level: %w", level, err)
-	}
-
-	return lvl, nil
-}
-
-func newLogEncoder(format string, gcpFields bool) (zapcore.Encoder, error) {
-	isTerminal := term.IsTerminal(int(os.Stdout.Fd())) // #nosec
-	encCfg := zap.NewProductionEncoderConfig()
-
-	// Normalize the log format based on the output device.
-	if format == autoLoggingFormat {
-		if isTerminal {
-			format = textLoggingFormat
-		} else {
-			format = jsonLoggingFormat
-		}
-	}
-
-	// Use a human-readable time format if running in a terminal.
-	if isTerminal {
-		encCfg.EncodeTime = func(ts time.Time, encoder zapcore.PrimitiveArrayEncoder) {
-			encoder.AppendString(ts.Local().Format("2006/01/02 15:04:05.000"))
-		}
-	}
-
-	// Configure level encoding based on format and GCP settings.
-	if format == textLoggingFormat && isTerminal {
-		if gcpFields {
-			encCfg.EncodeLevel = gcpSeverityColorEncoder
-		} else {
-			encCfg.EncodeLevel = zapcore.CapitalColorLevelEncoder
-		}
-	}
-
-	// For non-text (JSON) or when GCP fields are requested outside a terminal text output,
-	// adjust the configuration to use GCP-specific field names and encoders.
-	if gcpFields && format != textLoggingFormat {
-		encCfg.EncodeLevel = gcpSeverityEncoder
-		encCfg.TimeKey = "time"
-		encCfg.LevelKey = "severity"
-		encCfg.MessageKey = "message"
-		encCfg.EncodeTime = zapcore.ISO8601TimeEncoder
-		encCfg.EncodeDuration = zapcore.MillisDurationEncoder
-	}
-
-	switch format {
-	case textLoggingFormat:
-		return zapcore.NewConsoleEncoder(encCfg), nil
-	case jsonLoggingFormat:
-		return zapcore.NewJSONEncoder(encCfg), nil
-	default:
-		return nil, fmt.Errorf("%s is not a recognized log format", format)
-	}
-}
-
-// Singleton so that we instantiate our logger only once.
-var logger *zap.Logger = nil
-
-// Interface guards.
-var (
-	_ gotenberg.Module         = (*Logging)(nil)
-	_ gotenberg.Provisioner    = (*Logging)(nil)
-	_ gotenberg.Validator      = (*Logging)(nil)
-	_ gotenberg.LoggerProvider = (*Logging)(nil)
-	_ zapcore.Core             = (*customCore)(nil)
-)

pkg/modules/pdfcpu/pdfcpu.go

@@ -1,20 +1,19 @@
 package pdfcpu
 
 import (
-	"bytes"
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
+	"log/slog"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"sort"
-	"strconv"
 	"strings"
 	"syscall"
 
-	"go.uber.org/zap"
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/trace"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
@@ -29,16 +28,6 @@ type PdfCpu struct {
 	binPath string
 }
 
-type pdfcpuBookmark struct {
-	Title    string           `json:"title"`
-	Page     int              `json:"page"`
-	Children []pdfcpuBookmark `json:"kids,omitempty"`
-}
-
-type pdfcpuBookmarks struct {
-	Bookmarks []pdfcpuBookmark `json:"bookmarks"`
-}
-
 // Descriptor returns a [PdfCpu]'s module descriptor.
 func (engine *PdfCpu) Descriptor() gotenberg.ModuleDescriptor {
 	return gotenberg.ModuleDescriptor{
@@ -96,14 +85,20 @@ func (engine *PdfCpu) Debug() map[string]any {
 }
 
 // Merge combines multiple PDFs into a single PDF.
-func (engine *PdfCpu) Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+func (engine *PdfCpu) Merge(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "PdfCpu.Merge", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	args := make([]string, 0, 2+len(inputPaths))
 	args = append(args, "merge", outputPath)
 	args = append(args, inputPaths...)
 
 	cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
 	if err != nil {
-		return fmt.Errorf("create command: %w", err)
+		err = fmt.Errorf("create command: %w", err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return err
 	}
 
 	_, err = cmd.Exec()
@@ -111,11 +106,19 @@ func (engine *PdfCpu) Merge(ctx context.Context, logger *zap.Logger, inputPaths
 		return nil
 	}
 
-	return fmt.Errorf("merge PDFs with pdfcpu: %w", err)
+	err = fmt.Errorf("merge PDFs with pdfcpu: %w", err)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+	return err
 }
 
 // Split splits a given PDF file.
-func (engine *PdfCpu) Split(ctx context.Context, logger *zap.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+func (engine *PdfCpu) Split(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+	ctx, span := gotenberg.Tracer().Start(ctx, "PdfCpu.Split", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	var args []string
 
 	switch mode.Mode {
@@ -129,17 +132,26 @@ func (engine *PdfCpu) Split(ctx context.Context, logger *zap.Logger, mode gotenb
 		}
 		args = append(args, "extract", "-mode", "page", "-pages", mode.Span, inputPath, outputDirPath)
 	default:
-		return nil, fmt.Errorf("split PDFs using mode '%s' with pdfcpu: %w", mode.Mode, gotenberg.ErrPdfSplitModeNotSupported)
+		err := fmt.Errorf("split PDFs using mode '%s' with pdfcpu: %w", mode.Mode, gotenberg.ErrPdfSplitModeNotSupported)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return nil, err
 	}
 
 	cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
 	if err != nil {
-		return nil, fmt.Errorf("create command: %w", err)
+		err = fmt.Errorf("create command: %w", err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return nil, err
 	}
 
 	_, err = cmd.Exec()
 	if err != nil {
-		return nil, fmt.Errorf("split PDFs with pdfcpu: %w", err)
+		err = fmt.Errorf("split PDFs with pdfcpu: %w", err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return nil, err
 	}
 
 	var outputPaths []string
@@ -156,7 +168,10 @@ func (engine *PdfCpu) Split(ctx context.Context, logger *zap.Logger, mode gotenb
 		return nil
 	})
 	if err != nil {
-		return nil, fmt.Errorf("walk directory to find resulting PDFs from split with pdfcpu: %w", err)
+		err = fmt.Errorf("walk directory to find resulting PDFs from split with pdfcpu: %w", err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return nil, err
 	}
 
 	sort.Sort(digitSuffixSort(outputPaths))
@@ -165,172 +180,72 @@ func (engine *PdfCpu) Split(ctx context.Context, logger *zap.Logger, mode gotenb
 }
 
 // Flatten is not available in this implementation.
-func (engine *PdfCpu) Flatten(ctx context.Context, logger *zap.Logger, inputPath string) error {
+func (engine *PdfCpu) Flatten(ctx context.Context, logger *slog.Logger, inputPath string) error {
-	return fmt.Errorf("flatten PDF with pdfcpu: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "PdfCpu.Flatten", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("flatten PDF with pdfcpu: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
 // Convert is not available in this implementation.
-func (engine *PdfCpu) Convert(ctx context.Context, logger *zap.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+func (engine *PdfCpu) Convert(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
-	return fmt.Errorf("convert PDF to '%+v' with pdfcpu: %w", formats, gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "PdfCpu.Convert", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("convert PDF to '%+v' with pdfcpu: %w", formats, gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
 // ReadMetadata is not available in this implementation.
-func (engine *PdfCpu) ReadMetadata(ctx context.Context, logger *zap.Logger, inputPath string) (map[string]any, error) {
+func (engine *PdfCpu) ReadMetadata(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
-	return nil, fmt.Errorf("read PDF metadata with pdfcpu: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "PdfCpu.ReadMetadata", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("read PDF metadata with pdfcpu: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return nil, err
 }
 
 // WriteMetadata is not available in this implementation.
-func (engine *PdfCpu) WriteMetadata(ctx context.Context, logger *zap.Logger, metadata map[string]any, inputPath string) error {
+func (engine *PdfCpu) WriteMetadata(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
-	return fmt.Errorf("write PDF metadata with pdfcpu: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	_, span := gotenberg.Tracer().Start(ctx, "PdfCpu.WriteMetadata", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
+	err := fmt.Errorf("write PDF metadata with pdfcpu: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+	if err != nil {
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+	}
+
+	return err
 }
 
-// PageCount is not available in this implementation.
+// AddAttachments adds attachments into a PDF. All files are attached as
-func (engine *PdfCpu) PageCount(ctx context.Context, logger *zap.Logger, inputPath string) (int, error) {
+// file attachments without modifying the main PDF content.
-	return 0, fmt.Errorf("page count with pdfcpu: %w", gotenberg.ErrPdfEngineMethodNotSupported)
+func (engine *PdfCpu) AddAttachments(ctx context.Context, logger *slog.Logger, filePaths []string, inputPath string) error {
-}
+	ctx, span := gotenberg.Tracer().Start(ctx, "PdfCpu.AddAttachments", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
 
-// ReadBookmarks reads the document outline (bookmarks) of a PDF file using pdfcpu.
-func (engine *PdfCpu) ReadBookmarks(ctx context.Context, logger *zap.Logger, inputPath string) ([]gotenberg.Bookmark, error) {
-	tmpPath := fmt.Sprintf("%s.read.json", inputPath)
-	args := []string{"bookmarks", "export", inputPath, tmpPath}
-	cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
-	if err != nil {
-		return nil, fmt.Errorf("create command: %w", err)
-	}
-
-	defer func() {
-		err := os.Remove(tmpPath)
-		if err != nil && !os.IsNotExist(err) {
-			logger.Error(fmt.Sprintf("remove temporary bookmarks JSON file: %v", err))
-		}
-	}()
-
-	_, cmdErr := cmd.Exec()
-
-	// Check file existence and size.
-	info, statErr := os.Stat(tmpPath)
-
-	if cmdErr != nil {
-		// If the file wasn't created, or it was created but is 0 bytes,
-		// it means pdfcpu had no bookmarks to write.
-		if os.IsNotExist(statErr) || (statErr == nil && info.Size() == 0) {
-			return make([]gotenberg.Bookmark, 0), nil
-		}
-
-		// Fallback: Check the error string just in case pdfcpu failed without
-		// touching the file.
-		if strings.Contains(strings.ToLower(cmdErr.Error()), "no bookmarks") {
-			return make([]gotenberg.Bookmark, 0), nil
-		}
-		return nil, fmt.Errorf("read bookmarks with pdfcpu: %w", cmdErr)
-	}
-
-	// If cmd succeeded, but output a 0-byte file anyway.
-	if info != nil && info.Size() == 0 {
-		return make([]gotenberg.Bookmark, 0), nil
-	}
-
-	// Read the file content.
-	jsonBytes, err := os.ReadFile(tmpPath)
-	if err != nil {
-		return nil, fmt.Errorf("read temporary bookmarks JSON file: %w", err)
-	}
-
-	// Check if the content is just empty whitespace.
-	if len(bytes.TrimSpace(jsonBytes)) == 0 {
-		return make([]gotenberg.Bookmark, 0), nil
-	}
-
-	var data pdfcpuBookmarks
-	err = json.Unmarshal(jsonBytes, &data)
-	if err != nil {
-		return nil, fmt.Errorf("unmarshal bookmarks: %w", err)
-	}
-
-	// Safety check: Does the parsed JSON actually contain bookmarks?
-	if len(data.Bookmarks) == 0 {
-		return make([]gotenberg.Bookmark, 0), nil
-	}
-
-	var mapBookmarks func(bookmarks []pdfcpuBookmark) []gotenberg.Bookmark
-	mapBookmarks = func(bookmarks []pdfcpuBookmark) []gotenberg.Bookmark {
-		res := make([]gotenberg.Bookmark, len(bookmarks))
-		for i, b := range bookmarks {
-			res[i] = gotenberg.Bookmark{
-				Title:    b.Title,
-				Page:     b.Page,
-				Children: mapBookmarks(b.Children),
-			}
-		}
-		return res
-	}
-
-	return mapBookmarks(data.Bookmarks), nil
-}
-
-// WriteBookmarks adds a document outline (bookmarks) to a PDF file using pdfcpu.
-func (engine *PdfCpu) WriteBookmarks(ctx context.Context, logger *zap.Logger, inputPath string, bookmarks []gotenberg.Bookmark) error {
-	if len(bookmarks) == 0 {
-		return nil
-	}
-
-	var mapBookmarks func(bookmarks []gotenberg.Bookmark) []pdfcpuBookmark
-	mapBookmarks = func(bookmarks []gotenberg.Bookmark) []pdfcpuBookmark {
-		res := make([]pdfcpuBookmark, len(bookmarks))
-		for i, b := range bookmarks {
-			res[i] = pdfcpuBookmark{
-				Title:    b.Title,
-				Page:     b.Page,
-				Children: mapBookmarks(b.Children),
-			}
-		}
-		return res
-	}
-
-	data := pdfcpuBookmarks{
-		Bookmarks: mapBookmarks(bookmarks),
-	}
-
-	jsonBytes, err := json.Marshal(data)
-	if err != nil {
-		return fmt.Errorf("marshal bookmarks: %w", err)
-	}
-
-	tmpPath := fmt.Sprintf("%s.json", inputPath)
-	err = os.WriteFile(tmpPath, jsonBytes, 0o600)
-	if err != nil {
-		return fmt.Errorf("write temporary bookmarks JSON file: %w", err)
-	}
-
-	defer func() {
-		err := os.Remove(tmpPath)
-		if err != nil {
-			logger.Error(fmt.Sprintf("remove temporary bookmarks JSON file: %v", err))
-		}
-	}()
-
-	args := []string{"bookmarks", "import", "-replace", inputPath, tmpPath, inputPath}
-	cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
-	if err != nil {
-		return fmt.Errorf("create command: %w", err)
-	}
-
-	_, err = cmd.Exec()
-	if err != nil {
-		return fmt.Errorf("write bookmarks with pdfcpu: %w", err)
-	}
-
-	return nil
-}
-
-// EmbedFiles embeds files into a PDF. All files are embedded as file attachments
-// without modifying the main PDF content.
-func (engine *PdfCpu) EmbedFiles(ctx context.Context, logger *zap.Logger, filePaths []string, inputPath string) error {
 	if len(filePaths) == 0 {
 		return nil
 	}
 
-	logger.Debug(fmt.Sprintf("embedding %d file(s) to %s: %v", len(filePaths), inputPath, filePaths))
+	logger.DebugContext(ctx, fmt.Sprintf("attaching %d file(s) to %s: %v", len(filePaths), inputPath, filePaths))
 
 	args := make([]string, 0, 3+len(filePaths))
 	args = append(args, "attachments", "add", inputPath)
@@ -338,21 +253,33 @@ func (engine *PdfCpu) EmbedFiles(ctx context.Context, logger *zap.Logger, filePa
 
 	cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
 	if err != nil {
-		return fmt.Errorf("create command for attaching files: %w", err)
+		err = fmt.Errorf("create command for attaching files: %w", err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return err
 	}
 
 	_, err = cmd.Exec()
 	if err != nil {
-		return fmt.Errorf("attach files with pdfcpu: %w", err)
+		err = fmt.Errorf("attach files with pdfcpu: %w", err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return err
 	}
 
 	return nil
 }
 
 // Encrypt adds password protection to a PDF file using pdfcpu.
-func (engine *PdfCpu) Encrypt(ctx context.Context, logger *zap.Logger, inputPath, userPassword, ownerPassword string) error {
+func (engine *PdfCpu) Encrypt(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "PdfCpu.Encrypt", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	if userPassword == "" {
-		return errors.New("user password cannot be empty")
+		err := errors.New("user password cannot be empty")
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return err
 	}
 
 	if ownerPassword == "" {
@@ -369,84 +296,18 @@ func (engine *PdfCpu) Encrypt(ctx context.Context, logger *zap.Logger, inputPath
 
 	cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
 	if err != nil {
-		return fmt.Errorf("create command: %w", err)
+		err = fmt.Errorf("create command: %w", err)
+		span.RecordError(err)
+		span.SetStatus(codes.Error, err.Error())
+		return err
 	}
 
 	_, err = cmd.Exec()
 	if err != nil {
-		return fmt.Errorf("encrypt PDF with pdfcpu: %w", err)
+		err = fmt.Errorf("encrypt PDF with pdfcpu: %w", err)
-	}
+		span.RecordError(err)
-
+		span.SetStatus(codes.Error, err.Error())
-	return nil
+		return err
-}
-
-// Watermark applies a watermark (behind page content) to a PDF file using pdfcpu.
-func (engine *PdfCpu) Watermark(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
-	return engine.applyStampOrWatermark(ctx, logger, "watermark", inputPath, stamp)
-}
-
-// Stamp applies a stamp (on top of page content) to a PDF file using pdfcpu.
-func (engine *PdfCpu) Stamp(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
-	return engine.applyStampOrWatermark(ctx, logger, "stamp", inputPath, stamp)
-}
-
-// Rotate rotates pages of a PDF file by the given angle using pdfcpu.
-func (engine *PdfCpu) Rotate(ctx context.Context, logger *zap.Logger, inputPath string, angle int, pages string) error {
-	args := []string{"rotate"}
-	if pages != "" {
-		args = append(args, "-pages", pages)
-	}
-	args = append(args, "--", inputPath, strconv.Itoa(angle), inputPath)
-
-	cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
-	if err != nil {
-		return fmt.Errorf("create command: %w", err)
-	}
-
-	_, err = cmd.Exec()
-	if err != nil {
-		return fmt.Errorf("rotate PDF with pdfcpu: %w", err)
-	}
-
-	return nil
-}
-
-func (engine *PdfCpu) applyStampOrWatermark(ctx context.Context, logger *zap.Logger, command string, inputPath string, stamp gotenberg.Stamp) error {
-	var mode string
-	switch stamp.Source {
-	case gotenberg.StampSourceText:
-		mode = "text"
-	case gotenberg.StampSourceImage:
-		mode = "image"
-	case gotenberg.StampSourcePDF:
-		mode = "pdf"
-	default:
-		return fmt.Errorf("%s PDF with pdfcpu: %w", command, gotenberg.ErrPdfStampSourceNotSupported)
-	}
-
-	// Build description from Options map.
-	var descParts []string
-	for k, v := range stamp.Options {
-		descParts = append(descParts, fmt.Sprintf("%s:%s", k, v))
-	}
-	description := strings.Join(descParts, ", ")
-
-	args := []string{command, "add", "-mode", mode}
-
-	if stamp.Pages != "" {
-		args = append(args, "-pages", stamp.Pages)
-	}
-
-	args = append(args, "--", stamp.Expression, description, inputPath, inputPath)
-
-	cmd, err := gotenberg.CommandContext(ctx, logger, engine.binPath, args...)
-	if err != nil {
-		return fmt.Errorf("create command: %w", err)
-	}
-
-	_, err = cmd.Exec()
-	if err != nil {
-		return fmt.Errorf("%s PDF with pdfcpu: %w", command, err)
 	}
 
 	return nil

pkg/modules/pdfengines/multi.go

@@ -1,30 +1,28 @@
+//nolint:dupl
 package pdfengines
 
 import (
 	"context"
 	"fmt"
+	"log/slog"
 	"sync"
 
+	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/trace"
 	"go.uber.org/multierr"
-	"go.uber.org/zap"
 
 	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
 )
 
 type multiPdfEngines struct {
-	mergeEngines          []gotenberg.PdfEngine
+	mergeEngines         []gotenberg.PdfEngine
-	splitEngines          []gotenberg.PdfEngine
+	splitEngines         []gotenberg.PdfEngine
-	flattenEngines        []gotenberg.PdfEngine
+	flattenEngines       []gotenberg.PdfEngine
-	convertEngines        []gotenberg.PdfEngine
+	convertEngines       []gotenberg.PdfEngine
-	readMetadataEngines   []gotenberg.PdfEngine
+	readMetadataEngines  []gotenberg.PdfEngine
-	writeMetadataEngines  []gotenberg.PdfEngine
+	writeMetadataEngines []gotenberg.PdfEngine
-	passwordEngines       []gotenberg.PdfEngine
+	passwordEngines      []gotenberg.PdfEngine
-	embedEngines          []gotenberg.PdfEngine
+	attachmentsEngines   []gotenberg.PdfEngine
-	readBookmarksEngines  []gotenberg.PdfEngine
-	writeBookmarksEngines []gotenberg.PdfEngine
-	watermarkEngines      []gotenberg.PdfEngine
-	stampEngines          []gotenberg.PdfEngine
-	rotateEngines         []gotenberg.PdfEngine
 }
 
 func newMultiPdfEngines(
@@ -35,33 +33,26 @@ func newMultiPdfEngines(
 	readMetadataEngines,
 	writeMetadataEngines,
 	passwordEngines,
-	embedEngines,
+	attachmentsEngines []gotenberg.PdfEngine,
-	readBookmarksEngines,
-	writeBookmarksEngines,
-	watermarkEngines,
-	stampEngines,
-	rotateEngines []gotenberg.PdfEngine,
 ) *multiPdfEngines {
 	return &multiPdfEngines{
-		mergeEngines:          mergeEngines,
+		mergeEngines:         mergeEngines,
-		splitEngines:          splitEngines,
+		splitEngines:         splitEngines,
-		flattenEngines:        flattenEngines,
+		flattenEngines:       flattenEngines,
-		convertEngines:        convertEngines,
+		convertEngines:       convertEngines,
-		readMetadataEngines:   readMetadataEngines,
+		readMetadataEngines:  readMetadataEngines,
-		writeMetadataEngines:  writeMetadataEngines,
+		writeMetadataEngines: writeMetadataEngines,
-		passwordEngines:       passwordEngines,
+		passwordEngines:      passwordEngines,
-		embedEngines:          embedEngines,
+		attachmentsEngines:   attachmentsEngines,
-		readBookmarksEngines:  readBookmarksEngines,
-		writeBookmarksEngines: writeBookmarksEngines,
-		watermarkEngines:      watermarkEngines,
-		stampEngines:          stampEngines,
-		rotateEngines:         rotateEngines,
 	}
 }
 
 // Merge combines multiple PDF files into a single document using the first
 // available engine that supports PDF merging.
-func (multi *multiPdfEngines) Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+func (multi *multiPdfEngines) Merge(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "multiPdfEngines.Merge", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	var err error
 	errChan := make(chan error, 1)
 
@@ -81,7 +72,10 @@ func (multi *multiPdfEngines) Merge(ctx context.Context, logger *zap.Logger, inp
 		}
 	}
 
-	return fmt.Errorf("merge PDFs with multi PDF engines: %w", err)
+	err = fmt.Errorf("merge PDFs with multi PDF engines: %w", err)
+	span.RecordError(err)
+	span.SetStatus(codes.Error, err.Error())
+	return err
 }
 
 type splitResult struct {
@@ -91,7 +85,10 @@ type splitResult struct {
 
 // Split divides the PDF into separate pages using the first available engine
 // that supports PDF splitting.
-func (multi *multiPdfEngines) Split(ctx context.Context, logger *zap.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+func (multi *multiPdfEngines) Split(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+	ctx, span := gotenberg.Tracer().Start(ctx, "multiPdfEngines.Split", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	var err error
 	var mu sync.Mutex // to safely append errors.
 
@@ -117,12 +114,18 @@ func (multi *multiPdfEngines) Split(ctx context.Context, logger *zap.Logger, mod
 		}
 	}
 
-	return nil, fmt.Errorf("split PDF with multi PDF engines: %w", err)
+	err = fmt.Errorf("split PDF with multi PDF engines: %w", err)
+	span.RecordError(err)
+	span.SetStatus(codes.Error, err.Error())
+	return nil, err
 }
 
 // Flatten merges existing annotation appearances with page content using the
 // first available engine that supports flattening.
-func (multi *multiPdfEngines) Flatten(ctx context.Context, logger *zap.Logger, inputPath string) error {
+func (multi *multiPdfEngines) Flatten(ctx context.Context, logger *slog.Logger, inputPath string) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "multiPdfEngines.Flatten", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	var err error
 	errChan := make(chan error, 1)
 
@@ -142,12 +145,18 @@ func (multi *multiPdfEngines) Flatten(ctx context.Context, logger *zap.Logger, i
 		}
 	}
 
-	return fmt.Errorf("flatten PDF with multi PDF engines: %w", err)
+	err = fmt.Errorf("flatten PDF with multi PDF engines: %w", err)
+	span.RecordError(err)
+	span.SetStatus(codes.Error, err.Error())
+	return err
 }
 
 // Convert transforms the given PDF to a specific PDF format using the first
 // available engine that supports PDF conversion.
-func (multi *multiPdfEngines) Convert(ctx context.Context, logger *zap.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+func (multi *multiPdfEngines) Convert(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "multiPdfEngines.Convert", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	var err error
 	errChan := make(chan error, 1)
 
@@ -167,7 +176,10 @@ func (multi *multiPdfEngines) Convert(ctx context.Context, logger *zap.Logger, f
 		}
 	}
 
-	return fmt.Errorf("convert PDF to '%+v' with multi PDF engines: %w", formats, err)
+	err = fmt.Errorf("convert PDF to '%+v' with multi PDF engines: %w", formats, err)
+	span.RecordError(err)
+	span.SetStatus(codes.Error, err.Error())
+	return err
 }
 
 type readMetadataResult struct {
@@ -177,7 +189,10 @@ type readMetadataResult struct {
 
 // ReadMetadata extracts metadata from a PDF file using the first available
 // engine that supports metadata reading.
-func (multi *multiPdfEngines) ReadMetadata(ctx context.Context, logger *zap.Logger, inputPath string) (map[string]any, error) {
+func (multi *multiPdfEngines) ReadMetadata(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
+	ctx, span := gotenberg.Tracer().Start(ctx, "multiPdfEngines.ReadMetadata", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	var err error
 	var mu sync.Mutex // to safely append errors.
 
@@ -203,12 +218,18 @@ func (multi *multiPdfEngines) ReadMetadata(ctx context.Context, logger *zap.Logg
 		}
 	}
 
-	return nil, fmt.Errorf("read PDF metadata with multi PDF engines: %w", err)
+	err = fmt.Errorf("read PDF metadata with multi PDF engines: %w", err)
+	span.RecordError(err)
+	span.SetStatus(codes.Error, err.Error())
+	return nil, err
 }
 
-// WriteMetadata embeds metadata into a PDF file using the first available
+// WriteMetadata attachments metadata into a PDF file using the first available
 // engine that supports metadata writing.
-func (multi *multiPdfEngines) WriteMetadata(ctx context.Context, logger *zap.Logger, metadata map[string]any, inputPath string) error {
+func (multi *multiPdfEngines) WriteMetadata(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "multiPdfEngines.WriteMetadata", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	var err error
 	errChan := make(chan error, 1)
 
@@ -228,109 +249,18 @@ func (multi *multiPdfEngines) WriteMetadata(ctx context.Context, logger *zap.Log
 		}
 	}
 
-	return fmt.Errorf("write PDF metadata with multi PDF engines: %w", err)
+	err = fmt.Errorf("write PDF metadata with multi PDF engines: %w", err)
-}
+	span.RecordError(err)
-
+	span.SetStatus(codes.Error, err.Error())
-type pageCountResult struct {
+	return err
-	pageCount int
-	err       error
-}
-
-// PageCount returns the number of pages in a PDF file using the first available
-// engine that supports metadata reading.
-func (multi *multiPdfEngines) PageCount(ctx context.Context, logger *zap.Logger, inputPath string) (int, error) {
-	var err error
-	var mu sync.Mutex // to safely append errors.
-
-	for _, engine := range multi.readMetadataEngines {
-		resultChan := make(chan pageCountResult, 1)
-
-		go func(engine gotenberg.PdfEngine) {
-			pageCount, err := engine.PageCount(ctx, logger, inputPath)
-			resultChan <- pageCountResult{pageCount: pageCount, err: err}
-		}(engine)
-
-		select {
-		case result := <-resultChan:
-			if result.err != nil {
-				mu.Lock()
-				err = multierr.Append(err, result.err)
-				mu.Unlock()
-			} else {
-				return result.pageCount, nil
-			}
-		case <-ctx.Done():
-			return 0, ctx.Err()
-		}
-	}
-
-	return 0, fmt.Errorf("page count with multi PDF engines: %w", err)
-}
-
-type readBookmarksResult struct {
-	bookmarks []gotenberg.Bookmark
-	err       error
-}
-
-// ReadBookmarks reads bookmarks from a PDF file using the first available
-// engine that supports bookmarks reading.
-func (multi *multiPdfEngines) ReadBookmarks(ctx context.Context, logger *zap.Logger, inputPath string) ([]gotenberg.Bookmark, error) {
-	var err error
-	var mu sync.Mutex // to safely append errors.
-
-	for _, engine := range multi.readBookmarksEngines {
-		resultChan := make(chan readBookmarksResult, 1)
-
-		go func(engine gotenberg.PdfEngine) {
-			bookmarks, err := engine.ReadBookmarks(ctx, logger, inputPath)
-			resultChan <- readBookmarksResult{bookmarks: bookmarks, err: err}
-		}(engine)
-
-		select {
-		case result := <-resultChan:
-			if result.err != nil {
-				mu.Lock()
-				err = multierr.Append(err, result.err)
-				mu.Unlock()
-			} else {
-				return result.bookmarks, nil
-			}
-		case <-ctx.Done():
-			return nil, ctx.Err()
-		}
-	}
-
-	return nil, fmt.Errorf("read PDF bookmarks with multi PDF engines: %w", err)
-}
-
-// WriteBookmarks adds a document outline (bookmarks) to a PDF file using the
-// first available engine that supports bookmarks writing.
-func (multi *multiPdfEngines) WriteBookmarks(ctx context.Context, logger *zap.Logger, inputPath string, bookmarks []gotenberg.Bookmark) error {
-	var err error
-	errChan := make(chan error, 1)
-
-	for _, engine := range multi.writeBookmarksEngines {
-		go func(engine gotenberg.PdfEngine) {
-			errChan <- engine.WriteBookmarks(ctx, logger, inputPath, bookmarks)
-		}(engine)
-
-		select {
-		case writeBookmarksErr := <-errChan:
-			errored := multierr.AppendInto(&err, writeBookmarksErr)
-			if !errored {
-				return nil
-			}
-		case <-ctx.Done():
-			return ctx.Err()
-		}
-	}
-
-	return fmt.Errorf("write PDF bookmarks with multi PDF engines: %w", err)
 }
 
 // Encrypt adds password protection to a PDF file using the first available
 // engine that supports password protection.
-func (multi *multiPdfEngines) Encrypt(ctx context.Context, logger *zap.Logger, inputPath, userPassword, ownerPassword string) error {
+func (multi *multiPdfEngines) Encrypt(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "multiPdfEngines.Encrypt", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	var err error
 	errChan := make(chan error, 1)
 
@@ -350,23 +280,29 @@ func (multi *multiPdfEngines) Encrypt(ctx context.Context, logger *zap.Logger, i
 		}
 	}
 
-	return fmt.Errorf("encrypt PDF using multi PDF engines: %w", err)
+	err = fmt.Errorf("encrypt PDF using multi PDF engines: %w", err)
+	span.RecordError(err)
+	span.SetStatus(codes.Error, err.Error())
+	return err
 }
 
-// EmbedFiles embeds files into a PDF using the first available
+// AddAttachments adds attachments into a PDF using the first available
-// engine that supports file embedding.
+// engine that supports file attaching.
-func (multi *multiPdfEngines) EmbedFiles(ctx context.Context, logger *zap.Logger, filePaths []string, inputPath string) error {
+func (multi *multiPdfEngines) AddAttachments(ctx context.Context, logger *slog.Logger, filePaths []string, inputPath string) error {
+	ctx, span := gotenberg.Tracer().Start(ctx, "multiPdfEngines.AddAttachments", trace.WithSpanKind(trace.SpanKindInternal))
+	defer span.End()
+
 	var err error
 	errChan := make(chan error, 1)
 
-	for _, engine := range multi.embedEngines {
+	for _, engine := range multi.attachmentsEngines {
 		go func(engine gotenberg.PdfEngine) {
-			errChan <- engine.EmbedFiles(ctx, logger, filePaths, inputPath)
+			errChan <- engine.AddAttachments(ctx, logger, filePaths, inputPath)
 		}(engine)
 
 		select {
-		case embedErr := <-errChan:
+		case attachmentsErr := <-errChan:
-			errored := multierr.AppendInto(&err, embedErr)
+			errored := multierr.AppendInto(&err, attachmentsErr)
 			if !errored {
 				return nil
 			}
@@ -375,82 +311,10 @@ func (multi *multiPdfEngines) EmbedFiles(ctx context.Context, logger *zap.Logger
 		}
 	}
 
-	return fmt.Errorf("embed files into PDF using multi PDF engines: %w", err)
+	err = fmt.Errorf("add attachments into PDF using multi PDF engines: %w", err)
-}
+	span.RecordError(err)
-
+	span.SetStatus(codes.Error, err.Error())
-// Watermark applies a watermark (behind page content) to a PDF file using the
+	return err
-// first available engine that supports watermarking.
-func (multi *multiPdfEngines) Watermark(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
-	var err error
-	errChan := make(chan error, 1)
-
-	for _, engine := range multi.watermarkEngines {
-		go func(engine gotenberg.PdfEngine) {
-			errChan <- engine.Watermark(ctx, logger, inputPath, stamp)
-		}(engine)
-
-		select {
-		case watermarkErr := <-errChan:
-			errored := multierr.AppendInto(&err, watermarkErr)
-			if !errored {
-				return nil
-			}
-		case <-ctx.Done():
-			return ctx.Err()
-		}
-	}
-
-	return fmt.Errorf("watermark PDF with multi PDF engines: %w", err)
-}
-
-// Stamp applies a stamp (on top of page content) to a PDF file using the
-// first available engine that supports stamping.
-func (multi *multiPdfEngines) Stamp(ctx context.Context, logger *zap.Logger, inputPath string, stamp gotenberg.Stamp) error {
-	var err error
-	errChan := make(chan error, 1)
-
-	for _, engine := range multi.stampEngines {
-		go func(engine gotenberg.PdfEngine) {
-			errChan <- engine.Stamp(ctx, logger, inputPath, stamp)
-		}(engine)
-
-		select {
-		case stampErr := <-errChan:
-			errored := multierr.AppendInto(&err, stampErr)
-			if !errored {
-				return nil
-			}
-		case <-ctx.Done():
-			return ctx.Err()
-		}
-	}
-
-	return fmt.Errorf("stamp PDF with multi PDF engines: %w", err)
-}
-
-// Rotate rotates pages of a PDF file using the first available engine that
-// supports rotation.
-func (multi *multiPdfEngines) Rotate(ctx context.Context, logger *zap.Logger, inputPath string, angle int, pages string) error {
-	var err error
-	errChan := make(chan error, 1)
-
-	for _, engine := range multi.rotateEngines {
-		go func(engine gotenberg.PdfEngine) {
-			errChan <- engine.Rotate(ctx, logger, inputPath, angle, pages)
-		}(engine)
-
-		select {
-		case rotateErr := <-errChan:
-			errored := multierr.AppendInto(&err, rotateErr)
-			if !errored {
-				return nil
-			}
-		case <-ctx.Done():
-			return ctx.Err()
-		}
-	}
-
-	return fmt.Errorf("rotate PDF with multi PDF engines: %w", err)
 }
 
 // Interface guards.

pkg/modules/pdfengines/multi_test.go

@@ -0,0 +1,650 @@
+package pdfengines
+
+import (
+	"context"
+	"errors"
+	"log/slog"
+	"os"
+	"testing"
+
+	"github.com/gotenberg/gotenberg/v8/pkg/gotenberg"
+)
+
+func TestMultiPdfEngines_Merge(t *testing.T) {
+	for _, tc := range []struct {
+		scenario    string
+		engine      *multiPdfEngines
+		ctx         context.Context
+		expectError bool
+	}{
+		{
+			scenario: "nominal behavior",
+			engine: &multiPdfEngines{
+				mergeEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						MergeMock: func(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx:         context.Background(),
+			expectError: false,
+		},
+		{
+			scenario: "at least one engine does not return an error",
+			engine: &multiPdfEngines{
+				mergeEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						MergeMock: func(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						MergeMock: func(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx:         context.Background(),
+			expectError: false,
+		},
+		{
+			scenario: "all engines return an error",
+			engine: &multiPdfEngines{
+				mergeEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						MergeMock: func(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						MergeMock: func(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
+							return errors.New("foo")
+						},
+					},
+				},
+			},
+			ctx:         context.Background(),
+			expectError: true,
+		},
+		{
+			scenario: "context expired",
+			engine: &multiPdfEngines{
+				mergeEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						MergeMock: func(ctx context.Context, logger *slog.Logger, inputPaths []string, outputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: func() context.Context {
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
+
+				return ctx
+			}(),
+			expectError: true,
+		},
+	} {
+		t.Run(tc.scenario, func(t *testing.T) {
+			err := tc.engine.Merge(tc.ctx, slog.New(slog.NewJSONHandler(os.Stdout, nil)), nil, "")
+
+			if !tc.expectError && err != nil {
+				t.Fatalf("expected no error but got: %v", err)
+			}
+
+			if tc.expectError && err == nil {
+				t.Fatal("expected error but got none")
+			}
+		})
+	}
+}
+
+func TestMultiPdfEngines_Encrypt(t *testing.T) {
+	for _, tc := range []struct {
+		scenario    string
+		engine      *multiPdfEngines
+		ctx         context.Context
+		expectError bool
+	}{
+		{
+			scenario: "nominal behavior",
+			engine: &multiPdfEngines{
+				passwordEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						EncryptMock: func(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "at least one engine does not return an error",
+			engine: &multiPdfEngines{
+				passwordEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						EncryptMock: func(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						EncryptMock: func(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "all engines return an error",
+			engine: &multiPdfEngines{
+				passwordEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						EncryptMock: func(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						EncryptMock: func(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
+							return errors.New("foo")
+						},
+					},
+				},
+			},
+			ctx:         context.Background(),
+			expectError: true,
+		},
+		{
+			scenario: "context expired",
+			engine: &multiPdfEngines{
+				passwordEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						EncryptMock: func(ctx context.Context, logger *slog.Logger, inputPath, userPassword, ownerPassword string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: func() context.Context {
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
+
+				return ctx
+			}(),
+			expectError: true,
+		},
+	} {
+		t.Run(tc.scenario, func(t *testing.T) {
+			err := tc.engine.Encrypt(tc.ctx, slog.New(slog.NewJSONHandler(os.Stdout, nil)), "", "", "")
+
+			if !tc.expectError && err != nil {
+				t.Fatalf("expected no error but got: %v", err)
+			}
+
+			if tc.expectError && err == nil {
+				t.Fatal("expected error but got none")
+			}
+		})
+	}
+}
+
+func TestMultiPdfEngines_Split(t *testing.T) {
+	for _, tc := range []struct {
+		scenario    string
+		engine      *multiPdfEngines
+		ctx         context.Context
+		expectError bool
+	}{
+		{
+			scenario: "nominal behavior",
+			engine: &multiPdfEngines{
+				splitEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						SplitMock: func(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+							return nil, nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "at least one engine does not return an error",
+			engine: &multiPdfEngines{
+				splitEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						SplitMock: func(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+							return nil, errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						SplitMock: func(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+							return nil, nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "all engines return an error",
+			engine: &multiPdfEngines{
+				splitEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						SplitMock: func(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+							return nil, errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						SplitMock: func(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+							return nil, errors.New("foo")
+						},
+					},
+				},
+			},
+			ctx:         context.Background(),
+			expectError: true,
+		},
+		{
+			scenario: "context expired",
+			engine: &multiPdfEngines{
+				splitEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						SplitMock: func(ctx context.Context, logger *slog.Logger, mode gotenberg.SplitMode, inputPath, outputDirPath string) ([]string, error) {
+							return nil, nil
+						},
+					},
+				},
+			},
+			ctx: func() context.Context {
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
+
+				return ctx
+			}(),
+			expectError: true,
+		},
+	} {
+		t.Run(tc.scenario, func(t *testing.T) {
+			_, err := tc.engine.Split(tc.ctx, slog.New(slog.NewJSONHandler(os.Stdout, nil)), gotenberg.SplitMode{}, "", "")
+
+			if !tc.expectError && err != nil {
+				t.Fatalf("expected no error but got: %v", err)
+			}
+
+			if tc.expectError && err == nil {
+				t.Fatal("expected error but got none")
+			}
+		})
+	}
+}
+
+func TestMultiPdfEngines_Flatten(t *testing.T) {
+	for _, tc := range []struct {
+		scenario    string
+		engine      *multiPdfEngines
+		ctx         context.Context
+		expectError bool
+	}{
+		{
+			scenario: "nominal behavior",
+			engine: &multiPdfEngines{
+				flattenEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						FlattenMock: func(ctx context.Context, logger *slog.Logger, inputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "at least one engine does not return an error",
+			engine: &multiPdfEngines{
+				flattenEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						FlattenMock: func(ctx context.Context, logger *slog.Logger, inputPath string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						FlattenMock: func(ctx context.Context, logger *slog.Logger, inputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "all engines return an error",
+			engine: &multiPdfEngines{
+				flattenEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						FlattenMock: func(ctx context.Context, logger *slog.Logger, inputPath string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						FlattenMock: func(ctx context.Context, logger *slog.Logger, inputPath string) error {
+							return errors.New("foo")
+						},
+					},
+				},
+			},
+			ctx:         context.Background(),
+			expectError: true,
+		},
+		{
+			scenario: "context expired",
+			engine: &multiPdfEngines{
+				flattenEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						FlattenMock: func(ctx context.Context, logger *slog.Logger, inputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: func() context.Context {
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
+
+				return ctx
+			}(),
+			expectError: true,
+		},
+	} {
+		t.Run(tc.scenario, func(t *testing.T) {
+			err := tc.engine.Flatten(tc.ctx, slog.New(slog.NewJSONHandler(os.Stdout, nil)), "")
+
+			if !tc.expectError && err != nil {
+				t.Fatalf("expected no error but got: %v", err)
+			}
+
+			if tc.expectError && err == nil {
+				t.Fatal("expected error but got none")
+			}
+		})
+	}
+}
+
+func TestMultiPdfEngines_Convert(t *testing.T) {
+	for _, tc := range []struct {
+		scenario    string
+		engine      *multiPdfEngines
+		ctx         context.Context
+		expectError bool
+	}{
+		{
+			scenario: "nominal behavior",
+			engine: &multiPdfEngines{
+				convertEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						ConvertMock: func(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "at least one engine does not return an error",
+			engine: &multiPdfEngines{
+				convertEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						ConvertMock: func(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						ConvertMock: func(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "all engines return an error",
+			engine: &multiPdfEngines{
+				convertEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						ConvertMock: func(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						ConvertMock: func(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+							return errors.New("foo")
+						},
+					},
+				},
+			},
+			ctx:         context.Background(),
+			expectError: true,
+		},
+		{
+			scenario: "context expired",
+			engine: &multiPdfEngines{
+				convertEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						ConvertMock: func(ctx context.Context, logger *slog.Logger, formats gotenberg.PdfFormats, inputPath, outputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: func() context.Context {
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
+
+				return ctx
+			}(),
+			expectError: true,
+		},
+	} {
+		t.Run(tc.scenario, func(t *testing.T) {
+			err := tc.engine.Convert(tc.ctx, slog.New(slog.NewJSONHandler(os.Stdout, nil)), gotenberg.PdfFormats{}, "", "")
+
+			if !tc.expectError && err != nil {
+				t.Fatalf("expected no error but got: %v", err)
+			}
+
+			if tc.expectError && err == nil {
+				t.Fatal("expected error but got none")
+			}
+		})
+	}
+}
+
+func TestMultiPdfEngines_ReadMetadata(t *testing.T) {
+	for _, tc := range []struct {
+		scenario    string
+		engine      *multiPdfEngines
+		ctx         context.Context
+		expectError bool
+	}{
+		{
+			scenario: "nominal behavior",
+			engine: &multiPdfEngines{
+				readMetadataEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						ReadMetadataMock: func(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
+							return make(map[string]any), nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "at least one engine does not return an error",
+			engine: &multiPdfEngines{
+				readMetadataEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						ReadMetadataMock: func(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
+							return nil, errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						ReadMetadataMock: func(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
+							return make(map[string]any), nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "all engines return an error",
+			engine: &multiPdfEngines{
+				readMetadataEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						ReadMetadataMock: func(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
+							return nil, errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						ReadMetadataMock: func(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
+							return nil, errors.New("foo")
+						},
+					},
+				},
+			},
+			ctx:         context.Background(),
+			expectError: true,
+		},
+		{
+			scenario: "context expired",
+			engine: &multiPdfEngines{
+				readMetadataEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						ReadMetadataMock: func(ctx context.Context, logger *slog.Logger, inputPath string) (map[string]any, error) {
+							return make(map[string]any), nil
+						},
+					},
+				},
+			},
+			ctx: func() context.Context {
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
+
+				return ctx
+			}(),
+			expectError: true,
+		},
+	} {
+		t.Run(tc.scenario, func(t *testing.T) {
+			_, err := tc.engine.ReadMetadata(tc.ctx, slog.New(slog.NewJSONHandler(os.Stdout, nil)), "")
+
+			if !tc.expectError && err != nil {
+				t.Fatalf("expected no error but got: %v", err)
+			}
+
+			if tc.expectError && err == nil {
+				t.Fatal("expected error but got none")
+			}
+		})
+	}
+}
+
+func TestMultiPdfEngines_WriteMetadata(t *testing.T) {
+	for _, tc := range []struct {
+		scenario    string
+		engine      *multiPdfEngines
+		ctx         context.Context
+		expectError bool
+	}{
+		{
+			scenario: "nominal behavior",
+			engine: &multiPdfEngines{
+				writeMetadataEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						WriteMetadataMock: func(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "at least one engine does not return an error",
+			engine: &multiPdfEngines{
+				writeMetadataEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						WriteMetadataMock: func(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						WriteMetadataMock: func(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: context.Background(),
+		},
+		{
+			scenario: "all engines return an error",
+			engine: &multiPdfEngines{
+				writeMetadataEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						WriteMetadataMock: func(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
+							return errors.New("foo")
+						},
+					},
+					&gotenberg.PdfEngineMock{
+						WriteMetadataMock: func(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
+							return errors.New("foo")
+						},
+					},
+				},
+			},
+			ctx:         context.Background(),
+			expectError: true,
+		},
+		{
+			scenario: "context expired",
+			engine: &multiPdfEngines{
+				writeMetadataEngines: []gotenberg.PdfEngine{
+					&gotenberg.PdfEngineMock{
+						WriteMetadataMock: func(ctx context.Context, logger *slog.Logger, metadata map[string]any, inputPath string) error {
+							return nil
+						},
+					},
+				},
+			},
+			ctx: func() context.Context {
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
+
+				return ctx
+			}(),
+			expectError: true,
+		},
+	} {
+		t.Run(tc.scenario, func(t *testing.T) {
+			err := tc.engine.WriteMetadata(tc.ctx, slog.New(slog.NewJSONHandler(os.Stdout, nil)), nil, "")
+
+			if !tc.expectError && err != nil {
+				t.Fatalf("expected no error but got: %v", err)
+			}
+
+			if tc.expectError && err == nil {
+				t.Fatal("expected error but got none")
+			}
+		})
+	}
+}

pkg/modules/pdfengines/pdfengines.go

@@ -28,21 +28,16 @@ func init() {
 // the [api.Router] interface to expose relevant PDF processing routes if
 // enabled.
 type PdfEngines struct {
-	mergeNames          []string
+	mergeNames         []string
-	splitNames          []string
+	splitNames         []string
-	flattenNames        []string
+	flattenNames       []string
-	convertNames        []string
+	convertNames       []string
-	readMetadataNames   []string
+	readMetadataNames  []string
-	writeMetadataNames  []string
+	writeMetadataNames []string
-	encryptNames        []string
+	encryptNames       []string
-	embedNames          []string
+	attachmentsNames   []string
-	readBookmarksNames  []string
+	engines            []gotenberg.PdfEngine
-	writeBookmarksNames []string
+	disableRoutes      bool
-	watermarkNames      []string
-	stampNames          []string
-	rotateNames         []string
-	engines             []gotenberg.PdfEngine
-	disableRoutes       bool
 }
 
 // Descriptor returns a PdfEngines' module descriptor.
@@ -57,22 +52,10 @@ func (mod *PdfEngines) Descriptor() gotenberg.ModuleDescriptor {
 			fs.StringSlice("pdfengines-convert-engines", []string{"libreoffice-pdfengine"}, "Set the PDF engines and their order for the convert feature - empty means all")
 			fs.StringSlice("pdfengines-read-metadata-engines", []string{"exiftool"}, "Set the PDF engines and their order for the read metadata feature - empty means all")
 			fs.StringSlice("pdfengines-write-metadata-engines", []string{"exiftool"}, "Set the PDF engines and their order for the write metadata feature - empty means all")
-			fs.StringSlice("pdfengines-encrypt-engines", []string{"qpdf", "pdftk", "pdfcpu"}, "Set the PDF engines and their order for the password protection feature - empty means all")
+			fs.StringSlice("pdfengines-encrypt-engines", []string{"qpdf", "pdfcpu", "pdftk"}, "Set the PDF engines and their order for the password protection feature - empty means all")
-			fs.StringSlice("pdfengines-embed-engines", []string{"pdfcpu"}, "Set the PDF engines and their order for the file embedding feature - empty means all")
+			fs.StringSlice("pdfengines-add-attachments-engines", []string{"pdfcpu"}, "Set the PDF engines and their order for the file attaching feature - empty means all")
-			fs.StringSlice("pdfengines-read-bookmarks-engines", []string{"pdfcpu"}, "Set the PDF engines and their order for the read bookmarks feature - empty means all")
-			fs.StringSlice("pdfengines-write-bookmarks-engines", []string{"pdfcpu"}, "Set the PDF engines and their order for the write bookmarks feature - empty means all")
-			fs.StringSlice("pdfengines-watermark-engines", []string{"pdfcpu", "pdftk"}, "Set the PDF engines and their order for the watermark feature - empty means all")
-			fs.StringSlice("pdfengines-stamp-engines", []string{"pdfcpu", "pdftk"}, "Set the PDF engines and their order for the stamp feature - empty means all")
-			fs.StringSlice("pdfengines-rotate-engines", []string{"pdfcpu", "pdftk"}, "Set the PDF engines and their order for the rotate feature - empty means all")
 			fs.Bool("pdfengines-disable-routes", false, "Disable the routes")
 
-			// Deprecated flags.
-			fs.StringSlice("pdfengines-engines", make([]string, 0), "Set the default PDF engines and their default order - all by default")
-			err := fs.MarkDeprecated("pdfengines-engines", "use other flags for a more granular selection of PDF engines per method")
-			if err != nil {
-				panic(err)
-			}
-
 			return fs
 		}(),
 		New: func() gotenberg.Module { return new(PdfEngines) },
@@ -90,12 +73,7 @@ func (mod *PdfEngines) Provision(ctx *gotenberg.Context) error {
 	readMetadataNames := flags.MustStringSlice("pdfengines-read-metadata-engines")
 	writeMetadataNames := flags.MustStringSlice("pdfengines-write-metadata-engines")
 	encryptNames := flags.MustStringSlice("pdfengines-encrypt-engines")
-	embedNames := flags.MustStringSlice("pdfengines-embed-engines")
+	attachmentsNames := flags.MustStringSlice("pdfengines-add-attachments-engines")
-	readBookmarksNames := flags.MustStringSlice("pdfengines-read-bookmarks-engines")
-	writeBookmarksNames := flags.MustStringSlice("pdfengines-write-bookmarks-engines")
-	watermarkNames := flags.MustStringSlice("pdfengines-watermark-engines")
-	stampNames := flags.MustStringSlice("pdfengines-stamp-engines")
-	rotateNames := flags.MustStringSlice("pdfengines-rotate-engines")
 	mod.disableRoutes = flags.MustBool("pdfengines-disable-routes")
 
 	engines, err := ctx.Modules(new(gotenberg.PdfEngine))
@@ -117,7 +95,7 @@ func (mod *PdfEngines) Provision(ctx *gotenberg.Context) error {
 	// Example in the case of deprecated module name.
 	//for i, name := range defaultNames {
 	//	if name == "unoconv-pdfengine" || name == "uno-pdfengine" {
-	//		logger.Warn(fmt.Sprintf("%s is deprecated; prefer libreoffice-pdfengine instead", name))
+	//		logger.WarnContext(ctx, fmt.Sprintf("%s is deprecated; prefer libreoffice-pdfengine instead", name))
 	//		mod.defaultNames[i] = "libreoffice-pdfengine"
 	//	}
 	//}
@@ -157,34 +135,9 @@ func (mod *PdfEngines) Provision(ctx *gotenberg.Context) error {
 		mod.encryptNames = encryptNames
 	}
 
-	mod.embedNames = defaultNames
+	mod.attachmentsNames = defaultNames
-	if len(embedNames) > 0 {
+	if len(attachmentsNames) > 0 {
-		mod.embedNames = embedNames
+		mod.attachmentsNames = attachmentsNames
-	}
-
-	mod.readBookmarksNames = defaultNames
-	if len(readBookmarksNames) > 0 {
-		mod.readBookmarksNames = readBookmarksNames
-	}
-
-	mod.writeBookmarksNames = defaultNames
-	if len(writeBookmarksNames) > 0 {
-		mod.writeBookmarksNames = writeBookmarksNames
-	}
-
-	mod.watermarkNames = defaultNames
-	if len(watermarkNames) > 0 {
-		mod.watermarkNames = watermarkNames
-	}
-
-	mod.stampNames = defaultNames
-	if len(stampNames) > 0 {
-		mod.stampNames = stampNames
-	}
-
-	mod.rotateNames = defaultNames
-	if len(rotateNames) > 0 {
-		mod.rotateNames = rotateNames
 	}
 
 	return nil
@@ -235,12 +188,7 @@ func (mod *PdfEngines) Validate() error {
 	findNonExistingEngines(mod.readMetadataNames)
 	findNonExistingEngines(mod.writeMetadataNames)
 	findNonExistingEngines(mod.encryptNames)
-	findNonExistingEngines(mod.embedNames)
+	findNonExistingEngines(mod.attachmentsNames)
-	findNonExistingEngines(mod.readBookmarksNames)
-	findNonExistingEngines(mod.writeBookmarksNames)
-	findNonExistingEngines(mod.watermarkNames)
-	findNonExistingEngines(mod.stampNames)
-	findNonExistingEngines(mod.rotateNames)
 
 	if len(nonExistingEngines) == 0 {
 		return nil
@@ -260,12 +208,6 @@ func (mod *PdfEngines) SystemMessages() []string {
 		fmt.Sprintf("read metadata engines - %s", strings.Join(mod.readMetadataNames[:], " ")),
 		fmt.Sprintf("write metadata engines - %s", strings.Join(mod.writeMetadataNames[:], " ")),
 		fmt.Sprintf("encrypt engines - %s", strings.Join(mod.encryptNames[:], " ")),
-		fmt.Sprintf("embed engines - %s", strings.Join(mod.embedNames[:], " ")),
-		fmt.Sprintf("read bookmarks engines - %s", strings.Join(mod.readBookmarksNames[:], " ")),
-		fmt.Sprintf("write bookmarks engines - %s", strings.Join(mod.writeBookmarksNames[:], " ")),
-		fmt.Sprintf("watermark engines - %s", strings.Join(mod.watermarkNames[:], " ")),
-		fmt.Sprintf("stamp engines - %s", strings.Join(mod.stampNames[:], " ")),
-		fmt.Sprintf("rotate engines - %s", strings.Join(mod.rotateNames[:], " ")),
 	}
 }
 
@@ -293,12 +235,7 @@ func (mod *PdfEngines) PdfEngine() (gotenberg.PdfEngine, error) {
 		engines(mod.readMetadataNames),
 		engines(mod.writeMetadataNames),
 		engines(mod.encryptNames),
-		engines(mod.embedNames),
+		engines(mod.attachmentsNames),
-		engines(mod.readBookmarksNames),
-		engines(mod.writeBookmarksNames),
-		engines(mod.watermarkNames),
-		engines(mod.stampNames),
-		engines(mod.rotateNames),
 	), nil
 }
 
@@ -322,13 +259,8 @@ func (mod *PdfEngines) Routes() ([]api.Route, error) {
 		convertRoute(engine),
 		readMetadataRoute(engine),
 		writeMetadataRoute(engine),
-		readBookmarksRoute(engine),
-		writeBookmarksRoute(engine),
 		encryptRoute(engine),
-		embedRoute(engine),
+		attachmentsRoute(engine),
-		watermarkRoute(engine),
-		stampRoute(engine),
-		rotateRoute(engine),
 	}, nil
 }
 

pkg/modules/pdfengines/routes.go

@@ -84,7 +84,7 @@ func FormDataPdfSplitMode(form *api.FormData, mandatory bool) gotenberg.SplitMod
 }
 
 // FormDataPdfFormats creates [gotenberg.PdfFormats] from the form data.
-// Fallback to the default value if the considered key is not present.
+// Fallback to default value if the considered key is not present.
 func FormDataPdfFormats(form *api.FormData) gotenberg.PdfFormats {
 	var (
 		pdfa  string
@@ -128,129 +128,6 @@ func FormDataPdfMetadata(form *api.FormData, mandatory bool) map[string]any {
 	return metadata
 }
 
-// FormDataPdfBookmarks creates bookmarks from the form data.
-func FormDataPdfBookmarks(form *api.FormData, mandatory bool) any {
-	var bookmarks any
-
-	bookmarksFunc := func(value string) error {
-		if len(value) > 0 {
-			var list []gotenberg.Bookmark
-			err := json.Unmarshal([]byte(value), &list)
-			if err == nil {
-				bookmarks = list
-				return nil
-			}
-
-			var m map[string][]gotenberg.Bookmark
-			err = json.Unmarshal([]byte(value), &m)
-			if err == nil {
-				bookmarks = m
-				return nil
-			}
-
-			return fmt.Errorf("unmarshal bookmarks: %w", err)
-		}
-		return nil
-	}
-
-	if mandatory {
-		form.MandatoryCustom("bookmarks", func(value string) error {
-			return bookmarksFunc(value)
-		})
-	} else {
-		form.Custom("bookmarks", func(value string) error {
-			return bookmarksFunc(value)
-		})
-	}
-
-	return bookmarks
-}
-
-// FormDataPdfRotate creates rotation parameters from the form data.
-func FormDataPdfRotate(form *api.FormData, mandatory bool) (int, string) {
-	var angle int
-	var pages string
-
-	angleFunc := func(value string) error {
-		if value == "" {
-			return nil
-		}
-		v, err := strconv.Atoi(value)
-		if err != nil {
-			return err
-		}
-		if v != 90 && v != 180 && v != 270 {
-			return errors.New("wrong value, expected 90, 180, or 270")
-		}
-		angle = v
-		return nil
-	}
-
-	if mandatory {
-		form.MandatoryCustom("rotateAngle", func(value string) error {
-			return angleFunc(value)
-		})
-	} else {
-		form.Custom("rotateAngle", func(value string) error {
-			return angleFunc(value)
-		})
-	}
-	form.String("rotatePages", &pages, "")
-
-	return angle, pages
-}
-
-// RotateStub rotates pages of PDF files. If angle is 0, it does nothing.
-func RotateStub(ctx *api.Context, engine gotenberg.PdfEngine, angle int, pages string, inputPaths []string) error {
-	if angle == 0 {
-		return nil
-	}
-
-	for _, inputPath := range inputPaths {
-		err := engine.Rotate(ctx, ctx.Log(), inputPath, angle, pages)
-		if err != nil {
-			return fmt.Errorf("rotate '%s': %w", inputPath, err)
-		}
-	}
-
-	return nil
-}
-
-// ValidatePdfFormatsCompat checks for incompatible combinations of PDF formats
-// with other features and returns an appropriate error if found.
-func ValidatePdfFormatsCompat(pdfFormats gotenberg.PdfFormats, userPassword string, embedPaths []string) error {
-	zeroValued := gotenberg.PdfFormats{}
-	if pdfFormats == zeroValued {
-		return nil
-	}
-
-	// PDF/A forbids encryption per the standard.
-	if pdfFormats.PdfA != "" && userPassword != "" {
-		return api.WrapError(
-			errors.New("PDF/A format is incompatible with encryption"),
-			api.NewSentinelHttpError(
-				http.StatusBadRequest,
-				"Invalid form data: PDF/A format is incompatible with encryption",
-			),
-		)
-	}
-
-	// Only PDF/A-3 variants allow embedded file attachments.
-	if pdfFormats.PdfA != "" && len(embedPaths) > 0 {
-		if pdfFormats.PdfA != gotenberg.PdfA3a && pdfFormats.PdfA != gotenberg.PdfA3b && pdfFormats.PdfA != gotenberg.PdfA3u {
-			return api.WrapError(
-				fmt.Errorf("PDF format '%s' does not support embedded files", pdfFormats.PdfA),
-				api.NewSentinelHttpError(
-					http.StatusBadRequest,
-					fmt.Sprintf("Invalid form data: PDF format '%s' does not support embedded files; only PDF/A-3 variants allow attachments", pdfFormats.PdfA),
-				),
-			)
-		}
-	}
-
-	return nil
-}
-
 // MergeStub merges given PDFs. If only one input PDF, it does nothing and
 // returns the corresponding input path.
 func MergeStub(ctx *api.Context, engine gotenberg.PdfEngine, inputPaths []string) (string, error) {
@@ -377,64 +254,12 @@ func WriteMetadataStub(ctx *api.Context, engine gotenberg.PdfEngine, metadata ma
 	return nil
 }
 
-func shiftBookmarks(bookmarks []gotenberg.Bookmark, offset int) []gotenberg.Bookmark {
+// FormDataPdfAttachments extracts attached file paths from form data.
-	if offset == 0 {
+// Only files uploaded with the "attachments" field name are included.
-		return bookmarks
+func FormDataPdfAttachments(form *api.FormData) []string {
-	}
+	var attachmentsPaths []string
-	shifted := make([]gotenberg.Bookmark, len(bookmarks))
+	form.Attachments(&attachmentsPaths)
-	for i, b := range bookmarks {
+	return attachmentsPaths
-		shifted[i] = gotenberg.Bookmark{
-			Title:    b.Title,
-			Page:     b.Page + offset,
-			Children: shiftBookmarks(b.Children, offset),
-		}
-	}
-	return shifted
-}
-
-// WriteBookmarksStub writes the bookmarks into PDF files. If no bookmarks, it
-// does nothing.
-func WriteBookmarksStub(ctx *api.Context, engine gotenberg.PdfEngine, bookmarks any, inputPaths []string) error {
-	if bookmarks == nil {
-		return nil
-	}
-
-	switch b := bookmarks.(type) {
-	case []gotenberg.Bookmark:
-		if len(b) == 0 {
-			return nil
-		}
-
-		for _, inputPath := range inputPaths {
-			err := engine.WriteBookmarks(ctx, ctx.Log(), inputPath, b)
-			if err != nil {
-				return fmt.Errorf("write bookmarks into '%s': %w", inputPath, err)
-			}
-		}
-	case map[string][]gotenberg.Bookmark:
-		for _, inputPath := range inputPaths {
-			filename := filepath.Base(inputPath)
-			if specificBookmarks, ok := b[filename]; ok {
-				err := engine.WriteBookmarks(ctx, ctx.Log(), inputPath, specificBookmarks)
-				if err != nil {
-					return fmt.Errorf("write bookmarks into '%s': %w", inputPath, err)
-				}
-			}
-		}
-	default:
-		// Should not happen.
-		return fmt.Errorf("bookmarks type '%T' not supported", bookmarks)
-	}
-
-	return nil
-}
-
-// FormDataPdfEmbeds extracts embedded file paths from form data.
-// Only files uploaded with the "embeds" field name are included.
-func FormDataPdfEmbeds(form *api.FormData) []string {
-	var embedPaths []string
-	form.Embeds(&embedPaths)
-	return embedPaths
 }
 
 // FormDataPdfEncrypt extracts encryption parameters from form data.
@@ -460,132 +285,16 @@ func EncryptPdfStub(ctx *api.Context, engine gotenberg.PdfEngine, userPassword,
 	return nil
 }
 
-// EmbedFilesStub embeds files into PDF files.
+// AddAttachmentsStub adds attachments into PDF files.
-func EmbedFilesStub(ctx *api.Context, engine gotenberg.PdfEngine, embedPaths []string, inputPaths []string) error {
+func AddAttachmentsStub(ctx *api.Context, engine gotenberg.PdfEngine, attachmentsPaths []string, inputPaths []string) error {
-	if len(embedPaths) == 0 {
+	if len(attachmentsPaths) == 0 {
 		return nil
 	}
 
 	for _, inputPath := range inputPaths {
-		err := engine.EmbedFiles(ctx, ctx.Log(), embedPaths, inputPath)
+		err := engine.AddAttachments(ctx, ctx.Log(), attachmentsPaths, inputPath)
 		if err != nil {
-			return fmt.Errorf("embed files into PDF '%s': %w", inputPath, err)
+			return fmt.Errorf("add attachments into PDF '%s': %w", inputPath, err)
-		}
-	}
-
-	return nil
-}
-
-// FormDataPdfWatermark creates a [gotenberg.Stamp] for watermarking from the
-// form data.
-func FormDataPdfWatermark(form *api.FormData, mandatory bool) gotenberg.Stamp {
-	return formDataPdfStampOrWatermark(form, "watermark", mandatory)
-}
-
-// FormDataPdfStamp creates a [gotenberg.Stamp] for stamping from the form data.
-func FormDataPdfStamp(form *api.FormData, mandatory bool) gotenberg.Stamp {
-	return formDataPdfStampOrWatermark(form, "stamp", mandatory)
-}
-
-func formDataPdfStampOrWatermark(form *api.FormData, prefix string, mandatory bool) gotenberg.Stamp {
-	var (
-		source     string
-		expression string
-		pages      string
-		options    map[string]string
-	)
-
-	sourceFunc := func(value string) error {
-		if value != "" && value != gotenberg.StampSourceText && value != gotenberg.StampSourceImage && value != gotenberg.StampSourcePDF {
-			return fmt.Errorf("wrong value, expected either '%s', '%s' or '%s'", gotenberg.StampSourceText, gotenberg.StampSourceImage, gotenberg.StampSourcePDF)
-		}
-		source = value
-		return nil
-	}
-
-	optionsFunc := func(value string) error {
-		if value == "" {
-			return nil
-		}
-		err := json.Unmarshal([]byte(value), &options)
-		if err != nil {
-			return fmt.Errorf("unmarshal %s options: %w", prefix, err)
-		}
-		return nil
-	}
-
-	if mandatory {
-		form.
-			MandatoryCustom(prefix+"Source", func(value string) error {
-				return sourceFunc(value)
-			}).
-			String(prefix+"Expression", &expression, "").
-			String(prefix+"Pages", &pages, "").
-			Custom(prefix+"Options", func(value string) error {
-				return optionsFunc(value)
-			})
-	} else {
-		form.
-			Custom(prefix+"Source", func(value string) error {
-				return sourceFunc(value)
-			}).
-			String(prefix+"Expression", &expression, "").
-			String(prefix+"Pages", &pages, "").
-			Custom(prefix+"Options", func(value string) error {
-				return optionsFunc(value)
-			})
-	}
-
-	return gotenberg.Stamp{
-		Source:     source,
-		Expression: expression,
-		Pages:      pages,
-		Options:    options,
-	}
-}
-
-// FormDataPdfWatermarkFile extracts the watermark file path from form data.
-func FormDataPdfWatermarkFile(form *api.FormData) string {
-	var path string
-	form.Watermark(&path)
-	return path
-}
-
-// FormDataPdfStampFile extracts the stamp file path from form data.
-func FormDataPdfStampFile(form *api.FormData) string {
-	var path string
-	form.Stamp(&path)
-	return path
-}
-
-// WatermarkStub applies a watermark to a list of PDF files. If the stamp has
-// no source, it does nothing.
-func WatermarkStub(ctx *api.Context, engine gotenberg.PdfEngine, stamp gotenberg.Stamp, inputPaths []string) error {
-	if stamp.Source == "" {
-		return nil
-	}
-
-	for _, inputPath := range inputPaths {
-		err := engine.Watermark(ctx, ctx.Log(), inputPath, stamp)
-		if err != nil {
-			return fmt.Errorf("watermark '%s': %w", inputPath, err)
-		}
-	}
-
-	return nil
-}
-
-// StampStub applies a stamp to a list of PDF files. If the stamp has
-// no source, it does nothing.
-func StampStub(ctx *api.Context, engine gotenberg.PdfEngine, stamp gotenberg.Stamp, inputPaths []string) error {
-	if stamp.Source == "" {
-		return nil
-	}
-
-	for _, inputPath := range inputPaths {
-		err := engine.Stamp(ctx, ctx.Log(), inputPath, stamp)
-		if err != nil {
-			return fmt.Errorf("stamp '%s': %w", inputPath, err)
 		}
 	}
 
@@ -604,118 +313,33 @@ func mergeRoute(engine gotenberg.PdfEngine) api.Route {
 			form := ctx.FormData()
 			pdfFormats := FormDataPdfFormats(form)
 			metadata := FormDataPdfMetadata(form, false)
-			bookmarks := FormDataPdfBookmarks(form, false)
 			userPassword, ownerPassword := FormDataPdfEncrypt(form)
-			embedPaths := FormDataPdfEmbeds(form)
+			attachmentsPaths := FormDataPdfAttachments(form)
-			watermark := FormDataPdfWatermark(form, false)
-			watermarkFile := FormDataPdfWatermarkFile(form)
-			stamp := FormDataPdfStamp(form, false)
-			stampFile := FormDataPdfStampFile(form)
-			angle, rotatePages := FormDataPdfRotate(form, false)
 
 			var inputPaths []string
 			var flatten bool
-			var autoIndexBookmarks bool
 			err := form.
 				MandatoryPaths([]string{".pdf"}, &inputPaths).
 				Bool("flatten", &flatten, false).
-				Bool("autoIndexBookmarks", &autoIndexBookmarks, false).
 				Validate()
 			if err != nil {
 				return fmt.Errorf("validate form data: %w", err)
 			}
 
-			if (watermark.Source == gotenberg.StampSourceImage || watermark.Source == gotenberg.StampSourcePDF) && watermarkFile != "" {
-				watermark.Expression = watermarkFile
-			}
-			if (stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF) && stampFile != "" {
-				stamp.Expression = stampFile
-			}
-
-			err = ValidatePdfFormatsCompat(pdfFormats, userPassword, embedPaths)
-			if err != nil {
-				return err
-			}
-
 			outputPath := ctx.GeneratePath(".pdf")
 			err = engine.Merge(ctx, ctx.Log(), inputPaths, outputPath)
 			if err != nil {
 				return fmt.Errorf("merge PDFs: %w", err)
 			}
 
-			outputPaths := []string{outputPath}
+			outputPaths, err := ConvertStub(ctx, engine, pdfFormats, []string{outputPath})
-
-			err = WatermarkStub(ctx, engine, watermark, outputPaths)
-			if err != nil {
-				return fmt.Errorf("watermark PDFs: %w", err)
-			}
-
-			err = StampStub(ctx, engine, stamp, outputPaths)
-			if err != nil {
-				return fmt.Errorf("stamp PDFs: %w", err)
-			}
-
-			err = RotateStub(ctx, engine, angle, rotatePages, outputPaths)
-			if err != nil {
-				return fmt.Errorf("rotate PDFs: %w", err)
-			}
-
-			if flatten {
-				err = FlattenStub(ctx, engine, outputPaths)
-				if err != nil {
-					return fmt.Errorf("flatten PDFs: %w", err)
-				}
-			}
-
-			outputPaths, err = ConvertStub(ctx, engine, pdfFormats, outputPaths)
 			if err != nil {
 				return fmt.Errorf("convert PDF: %w", err)
 			}
 
-			// Bookmarks, metadata, and embeds are written after Convert,
+			err = AddAttachmentsStub(ctx, engine, attachmentsPaths, outputPaths)
-			// as LibreOffice strips them during PDF/A conversion.
+			if err != nil {
-
+				return fmt.Errorf("add attachments into PDFs: %w", err)
-			var finalBookmarks []gotenberg.Bookmark
-			if b, ok := bookmarks.([]gotenberg.Bookmark); ok {
-				finalBookmarks = b
-			} else {
-				bMap, _ := bookmarks.(map[string][]gotenberg.Bookmark)
-				if bMap != nil || autoIndexBookmarks {
-					offset := 0
-					for _, inputPath := range inputPaths {
-						filename := filepath.Base(inputPath)
-
-						var fileBookmarks []gotenberg.Bookmark
-						if bMap != nil {
-							fileBookmarks = bMap[filename]
-						}
-
-						if len(fileBookmarks) == 0 && autoIndexBookmarks {
-							fb, err := engine.ReadBookmarks(ctx, ctx.Log(), inputPath)
-							if err != nil {
-								return fmt.Errorf("read bookmarks of '%s': %w", filename, err)
-							}
-							fileBookmarks = fb
-						}
-
-						if len(fileBookmarks) > 0 {
-							finalBookmarks = append(finalBookmarks, shiftBookmarks(fileBookmarks, offset)...)
-						}
-
-						pageCount, err := engine.PageCount(ctx, ctx.Log(), inputPath)
-						if err != nil {
-							return fmt.Errorf("get page count of '%s': %w", filename, err)
-						}
-						offset += pageCount
-					}
-				}
-			}
-
-			if len(finalBookmarks) > 0 {
-				err = WriteBookmarksStub(ctx, engine, finalBookmarks, outputPaths)
-				if err != nil {
-					return fmt.Errorf("write bookmarks: %w", err)
-				}
 			}
 
 			err = WriteMetadataStub(ctx, engine, metadata, outputPaths)
@@ -723,9 +347,11 @@ func mergeRoute(engine gotenberg.PdfEngine) api.Route {
 				return fmt.Errorf("write metadata: %w", err)
 			}
 
-			err = EmbedFilesStub(ctx, engine, embedPaths, outputPaths)
+			if flatten {
-			if err != nil {
+				err = FlattenStub(ctx, engine, outputPaths)
-				return fmt.Errorf("embed files into PDFs: %w", err)
+				if err != nil {
+					return fmt.Errorf("flatten PDFs: %w", err)
+				}
 			}
 
 			err = EncryptPdfStub(ctx, engine, userPassword, ownerPassword, outputPaths)
@@ -757,12 +383,7 @@ func splitRoute(engine gotenberg.PdfEngine) api.Route {
 			pdfFormats := FormDataPdfFormats(form)
 			metadata := FormDataPdfMetadata(form, false)
 			userPassword, ownerPassword := FormDataPdfEncrypt(form)
-			embedPaths := FormDataPdfEmbeds(form)
+			attachmentsPaths := FormDataPdfAttachments(form)
-			watermark := FormDataPdfWatermark(form, false)
-			watermarkFile := FormDataPdfWatermarkFile(form)
-			stamp := FormDataPdfStamp(form, false)
-			stampFile := FormDataPdfStampFile(form)
-			angle, rotatePages := FormDataPdfRotate(form, false)
 
 			var inputPaths []string
 			var flatten bool
@@ -774,60 +395,31 @@ func splitRoute(engine gotenberg.PdfEngine) api.Route {
 				return fmt.Errorf("validate form data: %w", err)
 			}
 
-			if (watermark.Source == gotenberg.StampSourceImage || watermark.Source == gotenberg.StampSourcePDF) && watermarkFile != "" {
-				watermark.Expression = watermarkFile
-			}
-			if (stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF) && stampFile != "" {
-				stamp.Expression = stampFile
-			}
-
-			err = ValidatePdfFormatsCompat(pdfFormats, userPassword, embedPaths)
-			if err != nil {
-				return err
-			}
-
 			outputPaths, err := SplitPdfStub(ctx, engine, mode, inputPaths)
 			if err != nil {
 				return fmt.Errorf("split PDFs: %w", err)
 			}
 
-			err = WatermarkStub(ctx, engine, watermark, outputPaths)
-			if err != nil {
-				return fmt.Errorf("watermark PDFs: %w", err)
-			}
-
-			err = StampStub(ctx, engine, stamp, outputPaths)
-			if err != nil {
-				return fmt.Errorf("stamp PDFs: %w", err)
-			}
-
-			err = RotateStub(ctx, engine, angle, rotatePages, outputPaths)
-			if err != nil {
-				return fmt.Errorf("rotate PDFs: %w", err)
-			}
-
-			if flatten {
-				err = FlattenStub(ctx, engine, outputPaths)
-				if err != nil {
-					return fmt.Errorf("flatten PDFs: %w", err)
-				}
-			}
-
 			convertOutputPaths, err := ConvertStub(ctx, engine, pdfFormats, outputPaths)
 			if err != nil {
 				return fmt.Errorf("convert PDFs: %w", err)
 			}
 
-			// Metadata, embeds are written after Convert, as LibreOffice
+			err = AddAttachmentsStub(ctx, engine, attachmentsPaths, convertOutputPaths)
-			// strips them during PDF/A conversion.
+			if err != nil {
+				return fmt.Errorf("add attachments into PDFs: %w", err)
+			}
+
 			err = WriteMetadataStub(ctx, engine, metadata, convertOutputPaths)
 			if err != nil {
 				return fmt.Errorf("write metadata: %w", err)
 			}
 
-			err = EmbedFilesStub(ctx, engine, embedPaths, convertOutputPaths)
+			if flatten {
-			if err != nil {
+				err = FlattenStub(ctx, engine, convertOutputPaths)
-				return fmt.Errorf("embed files into PDFs: %w", err)
+				if err != nil {
+					return fmt.Errorf("flatten PDFs: %w", err)
+				}
 			}
 
 			err = EncryptPdfStub(ctx, engine, userPassword, ownerPassword, convertOutputPaths)
@@ -1027,83 +619,6 @@ func writeMetadataRoute(engine gotenberg.PdfEngine) api.Route {
 	}
 }
 
-// readBookmarksRoute returns an [api.Route] which returns the bookmarks of PDFs.
-func readBookmarksRoute(engine gotenberg.PdfEngine) api.Route {
-	return api.Route{
-		Method:      http.MethodPost,
-		Path:        "/forms/pdfengines/bookmarks/read",
-		IsMultipart: true,
-		Handler: func(c echo.Context) error {
-			ctx := c.Get("context").(*api.Context)
-
-			var inputPaths []string
-			err := ctx.FormData().
-				MandatoryPaths([]string{".pdf"}, &inputPaths).
-				Validate()
-			if err != nil {
-				return fmt.Errorf("validate form data: %w", err)
-			}
-
-			res := make(map[string][]gotenberg.Bookmark, len(inputPaths))
-			for _, inputPath := range inputPaths {
-				bookmarks, err := engine.ReadBookmarks(ctx, ctx.Log(), inputPath)
-				if err != nil {
-					return fmt.Errorf("read bookmarks: %w", err)
-				}
-
-				res[filepath.Base(inputPath)] = bookmarks
-			}
-
-			err = c.JSON(http.StatusOK, res)
-			if err != nil {
-				if strings.Contains(err.Error(), "request method or response status code does not allow body") {
-					// High probability that the user is using the webhook
-					// feature. It does not make sense for this route.
-					return api.ErrNoOutputFile
-				}
-				return fmt.Errorf("return JSON response: %w", err)
-			}
-
-			return api.ErrNoOutputFile
-		},
-	}
-}
-
-// writeBookmarksRoute returns an [api.Route] which can write bookmarks into PDFs.
-func writeBookmarksRoute(engine gotenberg.PdfEngine) api.Route {
-	return api.Route{
-		Method:      http.MethodPost,
-		Path:        "/forms/pdfengines/bookmarks/write",
-		IsMultipart: true,
-		Handler: func(c echo.Context) error {
-			ctx := c.Get("context").(*api.Context)
-
-			form := ctx.FormData()
-			bookmarks := FormDataPdfBookmarks(form, true)
-
-			var inputPaths []string
-			err := form.
-				MandatoryPaths([]string{".pdf"}, &inputPaths).
-				Validate()
-			if err != nil {
-				return fmt.Errorf("validate form data: %w", err)
-			}
-
-			err = WriteBookmarksStub(ctx, engine, bookmarks, inputPaths)
-			if err != nil {
-				return fmt.Errorf("write bookmarks: %w", err)
-			}
-
-			err = ctx.AddOutputPaths(inputPaths...)
-			if err != nil {
-				return fmt.Errorf("add output paths: %w", err)
-			}
-
-			return nil
-		},
-	}
-}
-
 // encryptRoute returns an [api.Route] which can add password protection to PDFs.
 func encryptRoute(engine gotenberg.PdfEngine) api.Route {
 	return api.Route{
@@ -1142,18 +657,17 @@ func encryptRoute(engine gotenberg.PdfEngine) api.Route {
 	}
 }
 
-// embedRoute returns an [api.Route] which can add embedded files to PDFs.
+// attachmentsRoute returns an [api.Route] which can add attached files to PDFs.
-// TODO: attachments instead?
+func attachmentsRoute(engine gotenberg.PdfEngine) api.Route {
-func embedRoute(engine gotenberg.PdfEngine) api.Route {
 	return api.Route{
 		Method:      http.MethodPost,
-		Path:        "/forms/pdfengines/embed",
+		Path:        "/forms/pdfengines/attachments/add",
 		IsMultipart: true,
 		Handler: func(c echo.Context) error {
 			ctx := c.Get("context").(*api.Context)
 
 			form := ctx.FormData()
-			embedPaths := FormDataPdfEmbeds(form)
+			attachmentsPaths := FormDataPdfAttachments(form)
 
 			var inputPaths []string
 			err := form.
@@ -1162,146 +676,10 @@ func embedRoute(engine gotenberg.PdfEngine) api.Route {
 			if err != nil {
 				return fmt.Errorf("validate form data: %w", err)
 			}
-			err = EmbedFilesStub(ctx, engine, embedPaths, inputPaths)
+
+			err = AddAttachmentsStub(ctx, engine, attachmentsPaths, inputPaths)
 			if err != nil {
-				return fmt.Errorf("embed files into PDFs: %w", err)
+				return fmt.Errorf("add attachments into PDFs: %w", err)
-			}
-
-			err = ctx.AddOutputPaths(inputPaths...)
-			if err != nil {
-				return fmt.Errorf("add output paths: %w", err)
-			}
-
-			return nil
-		},
-	}
-}
-
-// watermarkRoute returns an [api.Route] which can add watermarks to PDFs.
-//
-//nolint:dupl
-func watermarkRoute(engine gotenberg.PdfEngine) api.Route {
-	return api.Route{
-		Method:      http.MethodPost,
-		Path:        "/forms/pdfengines/watermark",
-		IsMultipart: true,
-		Handler: func(c echo.Context) error {
-			ctx := c.Get("context").(*api.Context)
-
-			form := ctx.FormData()
-			stamp := FormDataPdfWatermark(form, true)
-			watermarkFile := FormDataPdfWatermarkFile(form)
-
-			var inputPaths []string
-			err := form.
-				MandatoryPaths([]string{".pdf"}, &inputPaths).
-				Validate()
-			if err != nil {
-				return fmt.Errorf("validate form data: %w", err)
-			}
-
-			if stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF {
-				if watermarkFile == "" {
-					return api.WrapError(
-						errors.New("no watermark file provided"),
-						api.NewSentinelHttpError(
-							http.StatusBadRequest,
-							"Invalid form data: a watermark file is required for image or pdf source",
-						),
-					)
-				}
-				stamp.Expression = watermarkFile
-			}
-
-			err = WatermarkStub(ctx, engine, stamp, inputPaths)
-			if err != nil {
-				return fmt.Errorf("watermark PDFs: %w", err)
-			}
-
-			err = ctx.AddOutputPaths(inputPaths...)
-			if err != nil {
-				return fmt.Errorf("add output paths: %w", err)
-			}
-
-			return nil
-		},
-	}
-}
-
-// stampRoute returns an [api.Route] which can add stamps to PDFs.
-//
-//nolint:dupl
-func stampRoute(engine gotenberg.PdfEngine) api.Route {
-	return api.Route{
-		Method:      http.MethodPost,
-		Path:        "/forms/pdfengines/stamp",
-		IsMultipart: true,
-		Handler: func(c echo.Context) error {
-			ctx := c.Get("context").(*api.Context)
-
-			form := ctx.FormData()
-			stamp := FormDataPdfStamp(form, true)
-			stampFile := FormDataPdfStampFile(form)
-
-			var inputPaths []string
-			err := form.
-				MandatoryPaths([]string{".pdf"}, &inputPaths).
-				Validate()
-			if err != nil {
-				return fmt.Errorf("validate form data: %w", err)
-			}
-
-			if stamp.Source == gotenberg.StampSourceImage || stamp.Source == gotenberg.StampSourcePDF {
-				if stampFile == "" {
-					return api.WrapError(
-						errors.New("no stamp file provided"),
-						api.NewSentinelHttpError(
-							http.StatusBadRequest,
-							"Invalid form data: a stamp file is required for image or pdf source",
-						),
-					)
-				}
-				stamp.Expression = stampFile
-			}
-
-			err = StampStub(ctx, engine, stamp, inputPaths)
-			if err != nil {
-				return fmt.Errorf("stamp PDFs: %w", err)
-			}
-
-			err = ctx.AddOutputPaths(inputPaths...)
-			if err != nil {
-				return fmt.Errorf("add output paths: %w", err)
-			}
-
-			return nil
-		},
-	}
-}
-
-// rotateRoute returns an [api.Route] which can rotate pages of PDFs.
-func rotateRoute(engine gotenberg.PdfEngine) api.Route {
-	return api.Route{
-		Method:      http.MethodPost,
-		Path:        "/forms/pdfengines/rotate",
-		IsMultipart: true,
-		Handler: func(c echo.Context) error {
-			ctx := c.Get("context").(*api.Context)
-
-			form := ctx.FormData()
-			angle, pages := FormDataPdfRotate(form, true)
-
-			var inputPaths []string
-			err := form.
-				MandatoryPaths([]string{".pdf"}, &inputPaths).
-				Validate()
-			if err != nil {
-				return fmt.Errorf("validate form data: %w", err)
-			}
-
-			err = RotateStub(ctx, engine, angle, pages, inputPaths)
-			if err != nil {
-				return fmt.Errorf("rotate PDFs: %w", err)
 			}
 
 			err = ctx.AddOutputPaths(inputPaths...)