Move self-monitoring removal milestone to 16.0

data/deprecations/14-9-system_monitoring.yml

-- name: "GitLab self-monitoring"  # The name of the feature to be deprecated
+- name: "GitLab self-monitoring project"  # 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.
+  removal_milestone: "16.0"  # The milestone when this feature is planned to be removed
+  removal_date: "2023-05-22"  # 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.
+    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 16.0.
 # 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]

doc/update/deprecations.md

@@ -75,17 +75,17 @@ In 15.0, support for daemon mode for GitLab Pages will be removed.
 
 **Planned removal milestone: 15.0 (2022-05-22)**
 
-### GitLab self-monitoring
+### GitLab self-monitoring project
 
 WARNING:
-This feature will be changed or removed in 15.0
+This feature will be changed or removed in 16.0
 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.
+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 16.0.
 
-**Planned removal milestone: 15.0 (2022-05-22)**
+**Planned removal milestone: 16.0 (2023-05-22)**
 
 ### GraphQL permissions change for Package settings