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.
We need to extend Tor for relays to talk to other relays via IPv6. This task depends on #4564 (moved). The exact steps will be described in the roadmap that comes out of #4556 (moved).
This ticket is an optional deliverable for June 30, 2012 for sponsor G.