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.
There's really no difference between "I can't reach IPv6" and "ClientUseIPv6 0". Let's make them redundant. Let's also add an "I can't reach IPv4" option.
See #6027 (moved) and #9067 (moved)