I had thought about pointing all links to GitLab instead of GitHub.
But since the import is not perfect (some users did not get mapped, thumbs up below comments are missing etc), I decided to leave the links of old issues/PRs unchanged, having them point to the more readable, archived GitHub version. Example:
If you see any links in the wiki pointing to GitHub issues that gained new discussion input on GitLab, please switch the links to the GitLab version. Usually this means changing {{github|1234}} to {{issue|1234}}, see the template pages for details: