GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
https://blog.torproject.org/get-help-running-your-relay-our-new-advocate#comments (archive)
https://blog.torproject.org/get-help-running-your-relay-our-new-advocate?page=1%2C0 (archive)
looks like a bug