**Reason**
`analytics/wikistats` is no more maintained, the last code is from ~ 2015.
Its replacement is https://gerrit.wikimedia.org/g/analytics/wikistats2
@Milimetric on T113695#5674012 mentioned he has abandoned all patches so I guess we can archive it entirely.
**To-do list**
- This task
-- [x] Add maintainers of that extension/skin as subscribers to this task: @Milimetric
-- [x] Add Phabricator project #data-engineering-wikistats as a tag for this task, and remove #mediawiki-extensions-other/#other-skins as appropriate.
- On-wiki documentation
-- [ ] Archive documentation on `mediawiki.org` (provide URL): replace page contents with `{{Archived extension|last revision id before archiving|task=T######}}` (for extensions)/`{{Archived skin|last revision|task=T######}}` (for skins); replace `T######` with this task's number.
-- [ ] 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 [[ https://www.mediawiki.org/wiki/Special:ListUsers/translationadmin | 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 <#ProjectX> for the extension/skin.
-- [ ] Edit Phabricator project <#ProjectX> description for the extension/skin with a link to this ticket.
- Translatewiki.net/translations
-- [ ] Remove from `translatewiki.net` ([[ https://gerrit.wikimedia.org/r/plugins/gitiles/translatewiki/+/refs/heads/master/groups/MediaWiki/mediawiki-extensions.txt | groups/MediaWiki/mediawiki-extensions.txt ]] / [[ https://gerrit.wikimedia.org/r/plugins/gitiles/translatewiki/+/refs/heads/master/groups/MediaWiki/mediawiki-skins.txt | groups/MediaWiki/mediawiki-skins.txt ]]).
- Configuration/tests/integrations/etc.
-- [x] Remove tests in [[ https://gerrit.wikimedia.org/g/integration/config | integration/config ]] ([[ https://gerrit.wikimedia.org/r/plugins/gitiles/integration/config/+/master/zuul/layout.yaml | zuul/layout.yaml ]]).
-- [x] Remove Docker image `releng/perl` from integration/config
-- ~~[ ] Remove manifest/other references from [[ https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/vagrant/+/master | 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
-- [x] Empty repository, leaving only the README indicating the repo is archived, and referring to this task by URL. https://gerrit.wikimedia.org/r/c/analytics/wikistats/+/914713
-- ~~[ ] Remove from [[ https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/+/master | mediawiki/extensions ]] / [[ https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/skins/+/master | mediawiki/skins ]] (along with in `.gitmodules`).~~
-- [x] Mark the repository read-only in Gerrit (also edit description to prepend "[ARCHIVED]" and a reference to this task): https://gerrit.wikimedia.org/r/admin/repos/analytics/wikistats,general
-- [x] Archive the Diffusion repository: rANWS
-- [x] Delete the GitHub mirror: https://github.com/wikimedia/analytics-wikistats