Deprecation entry for instance_statistics_measurements

This change adds deprecation entry for the
instance_statistics_measurements GraphQL node.

data/deprecations/15-0-instance-statistics-graphql-node-removal.yml

+- name: "Querying Usage Trends via the `instanceStatisticsMeasurements` GraphQL node"
+  announcement_milestone: "14.8"
+  announcement_date: "2022-02-22"
+  removal_milestone: "15.0"
+  removal_date: "2022-05-22"
+  breaking_change: true
+  body: | # Do not modify this line, instead modify the lines below.
+    The `instanceStatisticsMeasurements` GraphQL node has been renamed to `usageTrendsMeasurements` in 13.10 and the old field name has been marked as deprecated. To fix the existing GraphQL queries, replace `instanceStatisticsMeasurements` with `usageTrendsMeasurements`.
+# The following items are not published on the docs page, but may be used in the future.
+  stage: Manage
+  tiers: [FREE]
+  issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/332323
+  documentation_url: https://docs.gitlab.com/ee/api/graphql/reference/index.html#queryusagetrendsmeasurements

doc/update/deprecations.md

@@ -717,6 +717,18 @@ The `merged_by` field in the [merge request API](https://docs.gitlab.com/ee/api/
 
 ## 14.8
 
+### Querying Usage Trends via the `instanceStatisticsMeasurements` GraphQL node
+
+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 `instanceStatisticsMeasurements` GraphQL node has been renamed to `usageTrendsMeasurements` in 13.10 and the old field name has been marked as deprecated. To fix the existing GraphQL queries, replace `instanceStatisticsMeasurements` with `usageTrendsMeasurements`.
+
+**Planned removal milestone: 15.0 (2022-05-22)**
+
 ### REST and GraphQL API Runner usage of `active` replaced by `paused`
 
 WARNING: