copyright

Signed-off-by: dentiny <dentinyhao@gmail.com>

Author: dentiny

src/ray/stats/opentelemetry_metrics.cc

@@ -1,3 +1,17 @@
+// Copyright 2025 The Ray Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 // TODO(hjiang): This is an example file which demonstrates opentelemetry dependency is
 // correct, should be replaced with real metrics exporter implementation.