Part of the discussion for the downside of centralization on GitHub is that it is also the issue tracker and wiki. Does GitLab offer mirroring for these service

Part of the discussion for the downside of centralization on GitHub is that it is also the issue tracker and wiki. Does GitLab offer mirroring for these services too? If I understand OP's question, it seems syncing would involve more than just `git push` from the local gitlab server to remote.