I haven't written the implementation for federated issues yet, but it should be relatively easy. Federated commenting works, but Gitea<->Mastodon interoperability is tricky. There is currently an issue in Mastodon that prevents Mastodon users from commenting on Gitea issues. Also, Mastodon has threads and Gitea doesn't.
@kurator88@toot.io Да нихрена не видно - я на себя подписаться не могу. https://github.com/go-gitea/gitea/labels/theme%2Ffederation - там ещё многое в процессе