I am a scientist, and I have links to my old Mercurial repositories in multiple academic publications, which I cannot change. I understand that keeping the repositories frozen or read-only after the end of support for Mercurial might be infeasible. However, I would greatly appreciate an option of putting permanent redirects from my Mercurial repositories to their up-to-date Git versions. That way, links in my publications will still resolve, while Atlassian won't need to keep anything Mercurial-related alive.