Federation transmits new content only. That delta is because the OG community (!asklemmy@lemmy.ml) existed longer than it's "copy" at programming.dev. The subscribers refers to local subscribers only, which on lemmy.ml will be ALL subscribers.
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I have another issue that I thought was defederation, am I missing something about how the fediverse works too?
On my lemmy.world acoount I made a post https://programming.dev/post/366871. Looking at it on my lemmy.world account, it has 15 points and 10 comments. Looking at it from programming.dev, it has 12 points and only 3 comments. I was thinking this meant there was some defederation I didn't know about, which is why I came to check the meta community out. I take it that isn't the case though?
I also want to learn how does federation work if e.g. lemmy.world is federated with some instance but programming.dev is not explicitly federated, nor defederated with that instance. Will I see posts from that instance? Is there an (automatic?) list of all the instances in federation?
Maybe I should create another post on meta, or is it answered already somewhere in the posts/doc/faq?
There is a version mismatch. lemmy.world is having trouble upgrading, which I believe also causes federation between instances to fail between these versions.
They have a thread about it here
The amount of subs there are the amount of people in this instance that have subscribed to that community. It doesnt convey that fact very well and the other stats arent updated to also reflect that though
Yea, this is something they should federated out in Lemmy. ActivityPub could transmit full subscriber counts so local instances always have the updated count. So many things I'm sure they'd like to do.