Neither of my posts from yesterday and today have made it out to their communities' home instance (lemmy.world), and neither has received any comments or votes. It seems like something to do with outgoing federation is stuck.
Edit to clarify:
The problem I'm seeing affects posts. I don't know if it affects comments.
It's possible that it only affects lemmy.world communities, but it definitely affects them even on other instances. Neither of these posts are showing up on any remote instance that I've seen:
https://lemmy.sdf.org/post/21620419
https://lemmy.sdf.org/post/21673588
6 days later, it's happening again:
https://lemmy.sdf.org/post/21974478
What can any of us itt do?
The point of posting is to create a record of the failure, for reference when someone wants to find a pattern or potentially fix it.
Several of us in this thread have already collected relevant information that might help pin it down.
Several times in the past, I have seen SDF members who also have a board account relay problems reported here to the board.
As for you yourself, maybe nothing? That's fine. Feel free to ignore it.