Reason
Per T22999#4963879, the extension is no longer available for download, and per comments on its MW.org talk page, it hasn't been maintained since before MediaWiki 1.18, and even back then it was already breaking.
To-do list
- This task
- Add maintainers of that extension 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): https://www.mediawiki.org/wiki/User_talk:Lindele#Archival_of_Extension:SelectCategoryTagCloud.
- Add Phabricator project <#ProjectX> as a tag for this task, or MediaWiki-extensions-Other if there is no project.
- On-wiki documentation
- Archive documentation on mediawiki.org (https://www.mediawiki.org/wiki/Extension:SelectCategoryTagCloud): replace page contents with {{TNT|Archived extension|2042667|reason=archive reasons, per [[phab:T216654]]}}.
- 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).
- Archive Wikidata item associated with documentation page (https://www.wikidata.org/wiki/Q21678411) (remove nearly all statements, except instance of (P31) = MediaWiki extension (Q6805426), which should add a qualifier end time (P582) = the YYYY-MM-DD date that you decided to archive extension, generally per edit history, change English (and other languages if possible) description to "archived MediaWiki extension" (and its translation)).
- Phabricator
- Mark all Phabricator tasks for the extension either Declined or Invalid.
- Translatewiki.net/translations
- Remove from translatewiki.net (groups/MediaWiki/mediawiki-extensions.txt) (add translatewiki.net project as a tag for this task).
- Configuration/tests/integrations/etc.
- Remove from mediawiki/extensions (along with in .gitmodules).
- Remove tests in [[ https://gerrit.wikimedia.org/g/integration/config | integration/config ]] (zuul/layout.yaml).
- Remove manifest/other references from mediawiki/vagrant if they exist.
- Remove from https://doc.wikimedia.org/cover-extensions/ if present (requires Continuous-Integration-Infrastructure shell user to delete directly from the server).
- 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 (Edit description to prepend "[ARCHIVED]" and append Task reference): (provide Gerrit Repository URL).
- Archive the diffusion repository for the extension/skin: (provide the Diffusion repository callsign or URL).
- Delete the GitHub mirror: (provide GitHub repository URL).