The Wikimedia Engineering Productivity team has decided that Wikimedia projects will move from Gerrit to GitLab for code review and continuous integration.
They have decided that this decision is not subject to any formal RFC. Previous attempts to change the code review system went through an RfC. They are, however, looking for feedback.
More information is at https://www.mediawiki.org/wiki/Wikimedia_Release_Engineering_Team/GitLab and the associated talk page.
Regards, AntICompositeNumber