The difference between forgejo and codeberg.org is clear. Forgejo is the software and codeberg is the entity that owns it, provides the domain name, etc. and also hosts a public forgejo instance at codeberg.org.

Lately, I’ve seen that there is also code.forgejo.org, which I assume is run by the same people. Why are there two public instances run by the same organisation? Are users supposed to migrate from one to the other? I see that code.forgejo.org currently has version 11.0 deployed which afaik is not released yet, so is that instance just for testing purposes?