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Can anyone direct me to a comprehensive explanation of how/what posts show up on a an instance's federated timeline?

Particularly, I'm referring to an #Akkoma instance, but I wonder if the mechanism is similar for all #ActivityPub servers.

#Admin #MastoAdmin #MastodonAdmin #FediAdmin #Pleroma
@Xantulon This is also helpful (thank you) but it still seems like (several) posts are making it on Fuzzy Roots federated timeline that do not fit the criteria in this flow chart.
@Xantulon Maybe this flow chart is Mastodon-specific and there are more differences between ActivityPub implementations than I thought..
I haven't seen any general activity pub diagrams like that. I'm sure it's in the specs, but visualizing it is much easier for me to trace
@Xantulon I agree with the visual help, for sure. From what I've read in the specs I haven't found anything that explains this.

So far, in my experiment, it seems that small instances may have discovery problems.
I wonder if messages are getting lost in queues. For the last hour(?) images have been taking forever to load. It may be a traffic processing issue