Add missing copyright headers

Summary: As titled

Reviewed By: lnyng

Differential Revision: D50416303

fbshipit-source-id: 6defce80ea8a3efe2e155a38c30bfeca591a70d1

contrib/grafana/import.py

@@ -1,5 +1,19 @@
 #!/bin/env python3
 
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# 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.
+
 import argparse
 import json
 import logging