Comment by rapnie

Gitlab has also indicated not to be interested as a company to develop this themself, and esp. not given all the other demands they get from their customer base. The epic you refer to had been closed for this reason, but was later reopened for the sake of the community. For there to be federation support in self-hosted Gitlab instances, a further community effort is needed, and right now AFAIK no one is actively working on any ActivityPub related user stories.