chore: switch to SPDX license headers (#4533)

Author: MikeGoldsmith

.git-blame-ignore-revs

@@ -0,0 +1,2 @@
+# Switch to SPDX license headers (#4533)
+# TODO: update with the squash-merge commit SHA after merge

.github/workflows/lint.yml

@@ -1353,3 +1353,22 @@ jobs:
 
       - name: Run tests
         run: tox -e lint-opamp-client
+
+  lint-license-header-check:
+    name: license-header-check
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout repo @ SHA - ${{ github.sha }}
+        uses: actions/checkout@v4
+
+      - name: Set up Python 3.14
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.14"
+
+      - name: Install tox
+        run: pip install tox-uv
+
+      - name: Run tests
+        run: tox -e lint-license-header-check

CHANGELOG.md

@@ -13,6 +13,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Switch to SPDX license headers and add CI enforcement
+  ([#4533](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4533))
 - Bump `pylint` to `4.0.5`
   ([#4244](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4244))
 - `opentelemetry-instrumentation-sqlite3`: Add uninstrument, error status, suppress, and no-op tests

CONTRIBUTING.md

@@ -306,6 +306,16 @@ The continuous integration overrides that environment variable with as per the c
 
 ## Style Guide
 
+* All Python files must include the following SPDX license header as the first
+  two lines (or immediately after a shebang line):
+
+  ```python
+  # Copyright The OpenTelemetry Authors
+  # SPDX-License-Identifier: Apache-2.0
+  ```
+
+  This is enforced by CI via `tox -e lint-license-header-check`.
+
 * docstrings should adhere to the [Google Python Style
   Guide](http://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings)
   as specified with the [napoleon

_template/version.py

@@ -1,15 +1,4 @@
 # Copyright The OpenTelemetry 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.
+# SPDX-License-Identifier: Apache-2.0
 
 __version__ = "0.63b0.dev"

docs/conf.py

@@ -1,3 +1,6 @@
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
 # Configuration file for the Sphinx documentation builder.
 #
 # This file only contains a selection of the most common options. For a full

exporter/opentelemetry-exporter-credential-provider-gcp/src/opentelemetry/gcp_credential_provider/__init__.py

@@ -1,16 +1,5 @@
 # Copyright 2025 Google LLC
-#
-# 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.
+# SPDX-License-Identifier: Apache-2.0
 
 import google.auth
 import grpc

exporter/opentelemetry-exporter-credential-provider-gcp/src/opentelemetry/gcp_credential_provider/version.py

@@ -1,15 +1,4 @@
 # Copyright The OpenTelemetry 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.
+# SPDX-License-Identifier: Apache-2.0
 
 __version__ = "0.63b0.dev"

exporter/opentelemetry-exporter-credential-provider-gcp/tests/test_credential_provider.py

@@ -1,16 +1,5 @@
 # Copyright 2023 Google LLC
-#
-# 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
-#
-#      https://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.
+# SPDX-License-Identifier: Apache-2.0
 from os import environ
 from unittest import TestCase
 from unittest.mock import MagicMock, patch

exporter/opentelemetry-exporter-prometheus-remote-write/example/sampleapp.py

@@ -1,16 +1,5 @@
 # Copyright The OpenTelemetry 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.
+# SPDX-License-Identifier: Apache-2.0
 
 import logging
 import random