Support transition from 1.37.0 to 1.39.0 in semconv

exporters/otlp/otlplog/otlploggrpc/internal/semconvutil.go

@@ -0,0 +1,37 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+package internal
+
+import (
+	"os"
+	"strings"
+)
+
+func GetStabilityMode() (emitOld, emitNew bool) {
+	optIn := os.Getenv("OTEL_SEMCONV_STABILITY_OPT_IN")
+
+	// Default: Only old conventions
+	if optIn == "" {
+		return true, false
+	}
+
+	modes := strings.Split(optIn, ",")
+	hasRPC := false
+	hasRPCDup := false
+	for _, m := range modes {
+		switch strings.TrimSpace(m) {
+		case "rpc/dup":
+			hasRPCDup = true
+		case "rpc":
+			hasRPC = true
+		}
+	}
+	switch {
+	case hasRPCDup:
+		return true, true // Emit BOTH (transition phase)
+	case hasRPC:
+		return false, true // Emit ONLY new
+	default:
+		return true, false // Only old conventions
+	}
+}