feat(logging): add GCP severity mapping

pkg/modules/logging/gcp.go

@@ -0,0 +1,36 @@
+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))
+}