For example, this channel is federated from Peertube as a Lemmy community. If you look at the community’s sidebar, there appears to be no moderator for the community; is this a federation issue? I would assume that the channel owner is responsible for moderation (of comments, as posts being allowed is technically a bug), but they aren’t listed.
An ActivityPub group actor defining its moderators is a specific implementation of the AP protocol. You can find the spec details lemmy uses here. An Mbin contributor recently implemented this to line up with Lemmy, but whether other fediverse software do or will is up to them, as it’s more of a community proposal than an official implementation of the spec. So when you see no moderators from other software, they likely just do not implement the linked FEP
If I understand correctly, if Peertube were to comply with this spec, then the owner of that peertube channel would show up as the moderator in the Lemmy community?
They could, yes. Afaik no extra work was needed on lemmy’s side once Mbin changed to report moderators in the same manner (aside from some kind of activity which triggered a refresh of the data)
However, looking at peertube, it looks like they already are using the
attributedTofield for the group with a person, which is different from the FEP. For the channel you link in the OP specifically:"attributedTo": [ { "type": "Person", "id": "https://tilvids.com/accounts/thelinuxexperiment" } ]It’s possible PeerTube could change to make a
/moderatorsendpoint and respond with that as the FEP suggests, or Lemmy and other software to change to accept this array of actor types instead. I’m not sure who decides these things or if there is an evangelist for FEPs, It’s possible this was already discussed on the peertube github as well, I didn’t look through all the past issues as there are quite a lot