Deprecation MR for Self-Monitoring

data/deprecations/14-9-system_monitoring.yml

+- name: "GitLab self-monitoring"  # The name of the feature to be deprecated
+  announcement_milestone: "14.9"  # The milestone when this feature was first announced as deprecated.
+  announcement_date: "2022-03-22"  # The date of the milestone release when this feature was first announced as deprecated. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
+  removal_milestone: "15.0"  # The milestone when this feature is planned to be removed
+  removal_date: "2022-05-22" # The date of the milestone release when this feature is planned to be removed. This should almost always be the 22nd of a month (YYYY-MM-22), unless you did an out of band blog post.
+  breaking_change: true  # If this deprecation is a breaking change, set this value to true
+  reporter: abellucci  # GitLab username of the person reporting the deprecation
+  body: |  # Do not modify this line, instead modify the lines below.
+    GitLab self-monitoring gives administrators of self-hosted GitLab instances the tools to monitor the health of their instances. This feature is deprecated in GitLab 14.9, and is scheduled for removal in 15.0.
+# The following items are not published on the docs page, but may be used in the future.
+  stage: Monitor  # (optional - may be required in the future) String value of the stage that the feature was created in. e.g., Growth
+  tiers:  [Core, Premium, Ultimate] # (optional - may be required in the future) An array of tiers that the feature is available in currently.  e.g., [Free, Silver, Gold, Core, Premium, Ultimate]
+  issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/348909 # (optional) This is a link to the deprecation issue in GitLab
+  documentation_url: https://docs.gitlab.com/ee/administration/monitoring/gitlab_self_monitoring_project/  # (optional) This is a link to the current documentation page

doc/update/deprecations.md

@@ -36,6 +36,20 @@ For deprecation reviewers (Technical Writers only):
   https://about.gitlab.com/handbook/marketing/blog/release-posts/#update-the-deprecations-doc
 -->
 
+## 14.9
+
+### GitLab self-monitoring
+
+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.
+
+GitLab self-monitoring gives administrators of self-hosted GitLab instances the tools to monitor the health of their instances. This feature is deprecated in GitLab 14.9, and is scheduled for removal in 15.0.
+
+**Planned removal milestone: 15.0 (2022-05-22)**
+
 ## 14.8
 
 ### Changes to the `CI_JOB_JWT`