Merge branch 'revert-1829280d' into 'master'

Reverting deprecation MR for Self-Monitoring

See merge request gitlab-org/gitlab!81059

data/deprecations/14-8-system_monitoring.yml

-- name: "GitLab self-monitoring"  # The name of the feature to be deprecated
-  announcement_milestone: "14.8"  # The milestone when this feature was first announced as deprecated.
-  announcement_date: "2022-02-22"  # 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.
-  breaking_change: false  # 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 14.8, but is not scheduled for removal. For more information, see our official [Statement of Support](https://about.gitlab.com/support/statement-of-support.html#gitlab-self-monitoring).
-# 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

@@ -900,10 +900,6 @@ To align with this change, API calls to list external status checks will also re
 
 **Planned removal milestone: 15.0 (2022-05-22)**
 
-### GitLab self-monitoring
-
-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 14.8, but is not scheduled for removal. For more information, see our official [Statement of Support](https://about.gitlab.com/support/statement-of-support.html#gitlab-self-monitoring).
-
 ### GraphQL ID and GlobalID compatibility
 
 WARNING: