Reason
Process partially done in https://gerrit.wikimedia.org/r/c/integration/config/+/517142

To-do list

• This task
  • Add maintainers of that extension/skin as subscribers to this task (if they have no apparent Phabricator account, notify them on-wiki or via email if possible and note it here).
  • Add Phabricator project <#trending-service> as a tag for this task, and remove MediaWiki-extensions-Other/Other-skins as appropriate.
• On-wiki documentation
  • Archive documentation on mediawiki.org ( https://www.mediawiki.org/wiki/Reading/Web/Projects/Edit_based_trending_service etc ); use {{Template:Historical}}
  • If documentation page was translatable, remove <translate>, visit Special:PageTranslation, and click "remove from translation" (if you don't have the translation administrator right, ask a user who does).
  • Update Wikidata item (provide URL) associated with documentation page
    • add statement Abandonware (Q281039) to instance of (P31) together with qualifier start time (P580) = the YYYY-MM-DD date that you decided to archive extension/skin (generally per edit history)
    • add qualifier end time (P582) = the YYYY-MM-DD (same date as above) to instance of (P31) = MediaWiki extension (Q6805426)/MediaWiki skin (Q21996535)
• Phabricator
  • Mark all Phabricator tasks for the extension/skin either Declined or Invalid. Add a comment pointing to this task when doing so for reference.
  • Archive Phabricator project <#trending-service> for the extension/skin.
  • Edit Phabricator project <#trending-service> description for the extension/skin with a link to this ticket.
• Configuration/tests/integrations/etc.
  • Remove tests in integration/config (zuul/layout.yaml).
• Repositories
  • Empty repository, leaving only the README indicating the repo is archived, and referring to this task by URL.
  • Mark the repository read-only in Gerrit (also edit description to prepend "[ARCHIVED]" and a reference to this task): (provide Gerrit Repository URL).
  • Archive the Diffusion repository for the extension/skin: (provide the Diffusion repository callsign or URL).
  • Delete the GitHub mirror: https://github.com/wikimedia/mediawiki-services-trending-edits