feat: store OTEL process context in named anonymous mapping on Linux

Author: nsavoire

ddtrace/tracer/otelprocesscontext.go

@@ -0,0 +1,27 @@
+// Unless explicitly stated otherwise all files in this repository are licensed
+// under the Apache License Version 2.0.
+// This product includes software developed at Datadog (https://www.datadoghq.com/).
+// Copyright 2025 Datadog, Inc.
+package tracer
+
+// OtelProcessContext represents the OTEL context for the process.
+//
+//go:generate go run github.com/tinylib/msgp -unexported -marshal=true -o=otelprocesscontext_msgp.go -tests=false
+type otelProcessContext struct {
+	// https://opentelemetry.io/docs/specs/semconv/registry/attributes/deployment/#deployment-environment-name
+	DeploymentEnvironmentName string `msg:"deployment.environment.name"`
+	// https://opentelemetry.io/docs/specs/semconv/registry/attributes/host/#host-name
+	HostName string `msg:"host.name"`
+	// https://opentelemetry.io/docs/specs/semconv/registry/attributes/service/#service-instance-id
+	ServiceInstanceID string `msg:"service.instance.id"`
+	// https://opentelemetry.io/docs/specs/semconv/registry/attributes/service/#service-name
+	ServiceName string `msg:"service.name"`
+	// https://opentelemetry.io/docs/specs/semconv/registry/attributes/service/#service-version
+	ServiceVersion string `msg:"service.version"`
+	// https://opentelemetry.io/docs/specs/semconv/registry/attributes/telemetry/#telemetry-sdk-language
+	TelemetrySdkLanguage string `msg:"telemetry.sdk.language"`
+	// https://opentelemetry.io/docs/specs/semconv/registry/attributes/telemetry/#telemetry-sdk-version
+	TelemetrySdkVersion string `msg:"telemetry.sdk.version"`
+	// https://opentelemetry.io/docs/specs/semconv/registry/attributes/telemetry/#telemetry-sdk-name
+	TelemetrySdkName string `msg:"telemetry.sdk.name"`
+}

ddtrace/tracer/otelprocesscontext_msgp.go

@@ -287,6 +287,23 @@ func storeConfig(c *config) {
 	if err != nil {
 		log.Error("failed to store the configuration: %s", err.Error())
 	}
+
+	processContext := otelProcessContext{
+		DeploymentEnvironmentName: c.env,
+		HostName:                  c.hostname,
+		ServiceInstanceID:         globalconfig.RuntimeID(),
+		ServiceName:               c.serviceName,
+		ServiceVersion:            c.version,
+		TelemetrySdkLanguage:      "go",
+		TelemetrySdkVersion:       version.Tag,
+		TelemetrySdkName:          "dd-trace-go",
+	}
+
+	data, _ = processContext.MarshalMsg(nil)
+	err = globalinternal.CreateOtelProcessContextMapping(data)
+	if err != nil {
+		log.Error("failed to store the OTEL process context: %s", err.Error())
+	}
 }
 
 // Stop stops the started tracer. Subsequent calls are valid but become no-op.

ddtrace/tracer/tracer.go

@@ -0,0 +1,12 @@
+// Unless explicitly stated otherwise all files in this repository are licensed
+// under the Apache License Version 2.0.
+// This product includes software developed at Datadog (https://www.datadoghq.com/).
+// Copyright 2025 Datadog, Inc.
+
+//go:build !linux
+
+package internal
+
+func CreateOtelProcessContextMapping(data []byte) error {
+	return nil
+}