The mw.org page of CustomUserSignup shows archived - https://www.mediawiki.org/wiki/Extension:CustomUserSignup:
- Remove from mediawiki/extensions ( along with in .gitmodules)
- Remove tests in integration/config ( zuul/layout.yaml )
- Remove from translatewiki ( groups/MediaWiki/mediawiki-extensions.txt )
- Empty repository and add a OBSOLETE file. -> https://gerrit.wikimedia.org/r/#/c/378542/
- Archive Phabricator project MediaWiki-extensions-CustomUserSignup for associated extension
- Edit Phabricator project MediaWiki-extensions-CustomUserSignup description for associated extension with a link to this ticket
- Archive the extension's diffusion repository: rECUS
- Mark the repository read-only in Gerrit: (Provide Gerrit Repository URL)