Merge branch 'connorgilbert/dotnet-21' into 'master'

Deprecation: SAST support for .NET 2.1

See merge request gitlab-org/gitlab!80470

data/deprecations/14-8-sast-dotnet-21.yml

+- name: "SAST support for .NET 2.1"
+  announcement_milestone: "14.8"
+  announcement_date: "2022-02-22"
+  removal_milestone: "15.0"
+  removal_date: "2022-05-22"
+  breaking_change: true
+  reporter: connorgilbert
+  body: |  # Do not modify this line, instead modify the lines below.
+    The GitLab SAST Security Code Scan analyzer scans .NET code for security vulnerabilities.
+    For technical reasons, the analyzer must first build the code to scan it.
+
+    In GitLab versions prior to 15.0, the default analyzer image (version 2) includes support for:
+
+    - .NET 2.1
+    - .NET 3.0 and .NET Core 3.0
+    - .NET Core 3.1
+    - .NET 5.0
+
+    In GitLab 15.0, we will change the default major version for this analyzer from version 2 to version 3. This change:
+
+    - Adds [severity values for vulnerabilities](https://gitlab.com/gitlab-org/gitlab/-/issues/350408) along with [other new features and improvements](https://gitlab.com/gitlab-org/security-products/analyzers/security-code-scan/-/blob/master/CHANGELOG.md).
+    - Removes .NET 2.1 support.
+    - Adds support for .NET 6.0, Visual Studio 2019, and Visual Studio 2022.
+
+    Version 3 was [announced in GitLab 14.6](https://about.gitlab.com/releases/2021/12/22/gitlab-14-6-released/#sast-support-for-net-6) and made available as an optional upgrade.
+
+    If you rely on .NET 2.1 support being present in the analyzer image by default, you must take action as detailed in the [deprecation issue for this change](https://gitlab.com/gitlab-org/gitlab/-/issues/352553#breaking-change).
+# The following items are not published on the docs page, but may be used in the future.
+  stage: Secure
+  tiers: [Free, Silver, Gold, Core, Premium, Ultimate]
+  issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/352553

doc/update/deprecations.md

@@ -1113,6 +1113,36 @@ If you applied customizations to any of the affected analyzers, you must take ac
 
 **Planned removal milestone: 15.0 (2022-05-22)**
 
+### SAST support for .NET 2.1
+
+WARNING:
+This feature will be changed or removed in 15.0
+as a [breaking change](https://docs.gitlab.com/ee/development/contributing/#breaking-changes).
+Before updating GitLab, review the details carefully to determine if you need to make any
+changes to your code, settings, or workflow.
+
+The GitLab SAST Security Code Scan analyzer scans .NET code for security vulnerabilities.
+For technical reasons, the analyzer must first build the code to scan it.
+
+In GitLab versions prior to 15.0, the default analyzer image (version 2) includes support for:
+
+- .NET 2.1
+- .NET 3.0 and .NET Core 3.0
+- .NET Core 3.1
+- .NET 5.0
+
+In GitLab 15.0, we will change the default major version for this analyzer from version 2 to version 3. This change:
+
+- Adds [severity values for vulnerabilities](https://gitlab.com/gitlab-org/gitlab/-/issues/350408) along with [other new features and improvements](https://gitlab.com/gitlab-org/security-products/analyzers/security-code-scan/-/blob/master/CHANGELOG.md).
+- Removes .NET 2.1 support.
+- Adds support for .NET 6.0, Visual Studio 2019, and Visual Studio 2022.
+
+Version 3 was [announced in GitLab 14.6](https://about.gitlab.com/releases/2021/12/22/gitlab-14-6-released/#sast-support-for-net-6) and made available as an optional upgrade.
+
+If you rely on .NET 2.1 support being present in the analyzer image by default, you must take action as detailed in the [deprecation issue for this change](https://gitlab.com/gitlab-org/gitlab/-/issues/352553#breaking-change).
+
+**Planned removal milestone: 15.0 (2022-05-22)**
+
 ### Support for gRPC-aware proxy deployed between Gitaly and rest of GitLab
 
 WARNING: