add license

Author: endorama

internal/loadgen/eventhandler/apm-collector.go

@@ -1,3 +1,7 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License 2.0;
+// you may not use this file except in compliance with the Elastic License 2.0.
+
 package eventhandler
 
 import (

internal/loadgen/eventhandler/apm-writer.go

@@ -1,3 +1,7 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License 2.0;
+// you may not use this file except in compliance with the Elastic License 2.0.
+
 package eventhandler
 
 import (

internal/loadgen/i/handler.go

@@ -1,3 +1,7 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License 2.0;
+// you may not use this file except in compliance with the Elastic License 2.0.
+
 // Package i provides interfaces shared by different event handlers,
 // as we need to support both Elastic APM and OTLP data handling.
 // Interfaces are in their own package to prevent cyclic import issues