Add deprecation for `job_age` parameter from `POST /jobs/request`

data/deprecations/15-2-job_age-deprecation.yml

+# This is a template for a feature deprecation.
+#
+# Please refer to the deprecation guidelines to confirm your understanding of GitLab's definitions.
+# https://docs.gitlab.com/ee/development/deprecation_guidelines/#terminology
+#
+# Deprecations must be announced at least three releases prior to removal.
+#
+# If an End of Support period applies, the announcement should be shared with GitLab Support
+# in the `#spt_managers` on Slack and mention `@gitlab-com/support` in this MR.
+#
+# Breaking changes must happen in a major release.
+#
+# For more information please refer to the handbook documentation here:
+# https://about.gitlab.com/handbook/marketing/blog/release-posts/#deprecations
+#
+# Please delete this line and above before submitting your merge request.
+#
+# REQUIRED FIELDS
+#
+- name: "Remove `job_age` parameter from `POST /jobs/request` Runner endpoint"  # (required) The name of the feature to be deprecated
+  announcement_milestone: "15.2"  # (required) The milestone when this feature was first announced as deprecated.
+  announcement_date: "2022-07-22"  # (required) 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: "16.0"  # (required) The milestone when this feature is planned to be removed
+  removal_date: "2023-05-22"  # (required) 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  # (required) If this deprecation is a breaking change, set this value to true
+  reporter: jheimbuck_gl  # (required) GitLab username of the person reporting the deprecation
+  stage: Verify # (required) String value of the stage that the feature was created in. e.g., Growth
+  issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/334253  # (required) Link to the deprecation issue in GitLab
+  body: |  # (required) Do not modify this line, instead modify the lines below.
+    The `job_age` parameter, returned from the `POST /jobs/request` API endpoint used in communication with GitLab Runner, was never used by any GitLab or Runner feature. This parameter will be removed in GitLab 16.0.
+
+    This could be a breaking change for anyone that developed their own runner that relies on this parameter being returned by the endpoint. This is not a breaking change for anyone using an officially released version of GitLab Runner, including public shared runners on GitLab.com.
+#
+# OPTIONAL FIELDS
+#
+  end_of_support_milestone:  # (optional) Use "XX.YY" format. The milestone when support for this feature will end.
+  end_of_support_date:  # (optional) The date of the milestone release when support for this feature will end.
+  tiers:  # (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]
+  documentation_url:  # (optional) This is a link to the current documentation page
+  image_url:  # (optional) This is a link to a thumbnail image depicting the feature
+  video_url:  # (optional) Use the youtube thumbnail URL with the structure of https://img.youtube.com/vi/UNIQUEID/hqdefault.jpg

doc/update/deprecations.md

@@ -45,6 +45,27 @@ sole discretion of GitLab Inc.
 
 <div class="announcement-milestone">
 
+## Announced in 15.2
+
+<div class="deprecation removal-160 breaking-change">
+
+### Remove `job_age` parameter from `POST /jobs/request` Runner endpoint
+
+Planned removal: GitLab <span class="removal-milestone">16.0</span> (2023-05-22)
+
+WARNING:
+This is a [breaking change](https://docs.gitlab.com/ee/development/contributing/#breaking-changes).
+Review the details carefully before upgrading.
+
+The `job_age` parameter, returned from the `POST /jobs/request` API endpoint used in communication with GitLab Runner, was never used by any GitLab or Runner feature. This parameter will be removed in GitLab 16.0.
+
+This could be a breaking change for anyone that developed their own runner that relies on this parameter being returned by the endpoint. This is not a breaking change for anyone using an officially released version of GitLab Runner, including public shared runners on GitLab.com.
+
+</div>
+</div>
+
+<div class="announcement-milestone">
+
 ## Announced in 15.1
 
 <div class="deprecation removal-160 breaking-change">