We should update the Phabricator deployment submodules repositories to point to the canonical Gerrit repositories instead of the diffusion mirrors.
| https://phabricator.wikimedia.org/diffusion/ARC/arcanist.git | **Moved to GitLab already:** https://gerrit.wikimedia.org/g/phabricator/arcanist
| https://phabricator.wikimedia.org/diffusion/PHSP/phabricator-sprint.git | Ignore/Remove per {T275325}; **Moved to GitLab already:** https://gerrit.wikimedia.org/g/phabricator/extensions/Sprint
| https://phabricator.wikimedia.org/source/phabricator-translations.git | **done {T321350}**; Moved to Gerrit: https://gerrit.wikimedia.org/g/phabricator/translations
| https://phabricator.wikimedia.org/diffusion/PHAB/phabricator.git | **Moved to GitLab already:** https://gerrit.wikimedia.org/g/phabricator/phabricator
| https://phabricator.wikimedia.org/diffusion/PHTO/phabricator-tools.git | **Moved to GitLab already:** https://gitlab.wikimedia.org/repos/phabricator/tools
| https://phabricator.wikimedia.org/diffusion/PHEX/phab-extensions.git | **Moved to GitLab already:** https://gerrit.wikimedia.org/g/phabricator/extensions
More or less related is https://phabricator.wikimedia.org/source/phabricator-translatewiki/ though it is not part of the phabricator/deployment repository (and is disabled and inactive)
For the records, there is also the (deployed) extension https://gerrit.wikimedia.org/g/phabricator/antivandalism/ with its canonical code repo still on Gerrit (instead of most other Phab repos being on GitLab).