@ruihildt Updates to packages are rolled out slowly. So if a user tries to check for an update manually (i.e they click for 'check for updates') and they are not part of the rollout, they get shown that message. Generally, it is safe to update anyway but we are just being careful here.
@grienauer we started out initially with a rocket.chat instance which is still alive and used mostly for internal communication though. Once we had this forum, we essentially wanted the community to move here, since the chat turned out to not be very helpful with issue and solution search-ability. Of course also no public indexing of the channels.