Merge pull request #5987 from github/repo-sync

repo sync

Author: Octomerger

content/actions/reference/workflow-syntax-for-github-actions.md

@@ -1019,7 +1019,7 @@ You can create a matrix to run workflows on more than one runner operating syste
 runs-on: ${{ matrix.os }}
 strategy:
   matrix:
-    os: [ubuntu-16.04, ubuntu-18.04]
+    os: [ubuntu-18.04, ubuntu-20.04]
     node: [10, 12, 14]
 steps:
   - uses: actions/setup-node@v2

content/actions/using-github-hosted-runners/about-github-hosted-runners.md

@@ -77,7 +77,6 @@ For the overall list of included tools for each runner operating system, see the
 
 * [Ubuntu 20.04 LTS](https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu2004-README.md)
 * [Ubuntu 18.04 LTS](https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu1804-README.md)
-* [Ubuntu 16.04 LTS](https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu1604-README.md)
 * [Windows Server 2019](https://github.com/actions/virtual-environments/blob/main/images/win/Windows2019-Readme.md)
 * [Windows Server 2016](https://github.com/actions/virtual-environments/blob/main/images/win/Windows2016-Readme.md)
 * [macOS 11.0](https://github.com/actions/virtual-environments/blob/main/images/macos/macos-11.0-Readme.md)

data/reusables/github-actions/supported-github-runners.md

@@ -1,9 +1,14 @@
+{% warning %}
+
+**Warning**: Ubuntu 16.04 is being deprecated. If any of your workflows use Ubuntu 16.04, migrate to Ubuntu 20.04 or 18.04. For more information, see [the blog post](https://github.blog/changelog/2021-04-29-github-actions-ubuntu-16-04-lts-virtual-environment-will-be-removed-on-september-20-2021).
+
+{% endwarning %}
+
 | Virtual environment | YAML workflow label |
 | --------------------|---------------------|
 | Windows Server 2019 | `windows-latest` or `windows-2019` |
 | Windows Server 2016 | `windows-2016` |
 | Ubuntu 20.04 | `ubuntu-latest` or `ubuntu-20.04` |
 | Ubuntu 18.04 | `ubuntu-18.04` |
-| Ubuntu 16.04 | `ubuntu-16.04` |
 | macOS Big Sur 11.0 | `macos-11.0` |
 | macOS Catalina 10.15 | `macos-latest` or `macos-10.15` |