Self-monitoring docs deprecation warnings

doc/administration/monitoring/gitlab_self_monitoring_project/index.md

@@ -4,10 +4,14 @@ group: Respond
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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-# Self monitoring project **(FREE SELF)**
+# Self-monitoring project (DEPRECATED) **(FREE SELF)**
 
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/32351) in GitLab 12.7, behind a disabled feature flag (`self_monitoring_project`).
-> - The feature flag was removed and the self monitoring project was [made generally available](https://gitlab.com/gitlab-org/gitlab/-/issues/198511) in GitLab 12.8.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/32351) in GitLab 12.7 [with a flag](../../feature_flags.md) named `self_monitoring_project`. Disabled by default.
+> - Generally available in GitLab 12.8. [Feature flag `self_monitoring_project`](https://gitlab.com/gitlab-org/gitlab/-/issues/198511) removed.
+> - [Deprecated](https://gitlab.com/gitlab-org/gitlab/-/issues/348909) in GitLab 14.8.
+
+WARNING:
+This feature was [deprecated](https://gitlab.com/gitlab-org/gitlab/-/issues/348909) in GitLab 14.8.
 
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