**Reason**
This extension's MediaWiki.org page was [[ https://www.mediawiki.org/w/index.php?title=Extension:Preloader&diff=2904221&oldid=2521312 | marked as archived ]] by @PlavorSeol earlier today. Accordng to the [[ https://www.mediawiki.org/w/index.php?title=Extension:Preloader&oldid=2521312 | pre-archival page ]], the extension has not been updated since 2011 and explicitly supports MediaWiki 1.7, so it is drastically out of date. However, the infobox also claims that the latest extension version is 1.2.0, while WikiApiary claims that there are 1.2.1 and 1.2.2 installations in the wild. Thus a bit of further investigation should be conducted before deciding whether the archival should proceed further.
=== Update
The new maintainer has moved to [[ https://gitlab.com/troyengel/Preloader | Gitlab ]]. Outside archiving on MediaWiki.org, we can proceed with the other things.
**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).~~ The listed maintainer, Robchurch, does not appear to have contributed to any WMF project since 2008, and his [[ https://www.mediawiki.org/wiki/User:Robchurch | MW.org userpage ]] states he is "not currently involved in developing the MediaWiki software or extensions". (If anyone wants to try reaching out to him regardless, be my guest.)
-- [x] Add Phabricator project #mediawiki-extensions-preloader as a tag for this task.
- On-wiki documentation
-- [x] Archive documentation on `mediawiki.org` (https://www.mediawiki.org/wiki/Extension:Preloader): replace page contents with `{{TNT|Archived extension|last revision id before archiving|reason=archive reasons, per [[phab:T######]]}}`; include a link to this task in the `reason` parameter - These have been updated to point to the new repo.
-- [ ] If documentation page was translatable, remove `<translate>`, visit Special:PageTranslationArchive documentation on `mediawiki.org` (https://www.mediawiki.org/wiki/Extension:Preloader): replace page contents with `{{TNT|Archived extension|last revision id before archiving|reason=archive reasons, and click "remove from translation" (if you don't have the translation administrator right,per [[phab:T205952]]}}`; ask a [[ https://www.mediawiki.org/wiki/Special:ListUsers/translationadmin | user who does ]]).include a link to this task in the `reason` parameter.
-- [ ] Archive Wikidata item associated with documentation page (https://www.wikidata.org/wiki/Q21678092) (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
-- [ ] Archive Phabricator project #mediawiki-extensions-preloader for the extension.
-- [ ] Mark all Phabricator tasks for the extension either Declined or Invalid.
-- [ ] Edit Phabricator project #mediawiki-extensions-preloader description for the extension with a link to this ticket.
- Translatewiki.net/translations
-- [ ] Remove from `translatewiki.net` (`groups/MediaWiki/mediawiki-extensions.txt`).
- 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 and add an ARCHIVED file.
-- [ ] Archive the diffusion repository for the extension: (provide the Diffusion repository callsign or URL).
-- [ ] Mark the repository read-only in Gerrit: (provide Gerrit Repository URL).
-- [ ] Add a link to the gitlab repository, -- [ ] Deleteper the GitHub mirror: (provide GitHub repository URL)maintainers request.