So I've been troubleshooting the federation issues with some other admins:
(Thanks for the help)
So what we see is that when there are many federation workers running at the same time, they get too slow, causing them to timeout and fail.
I had federation workers set to 200000. I've now lowered that to 8192, and set the activitypub logging to debugging to get queue stats. RUST_LOG="warn,lemmy_server=warn,lemmy_api=warn,lemmy_api_common=warn,lemmy_api_crud=warn,lemmy_apub=warn,lemmy_db_schema=warn,lemmy_db_views=warn,lemmy_db_views_actor=warn,lemmy_db_views_moderator=warn,lemmy_routes=warn,lemmy_utils=warn,lemmy_websocket=warn,activitypub_federation=debug"
Also, I saw that there were many workers retrying to servers that are unreachable. So, I've blocked some of these servers:
commallama.social,mayheminc.win,lemmy.name,lm.runnerd.net,frostbyrne.io,be-lemmy.org,lemmonade.marbledfennec.net,lemmy.sarcasticdeveloper.com,lemmy.kosapps.com,pawb.social,kbin.wageoffsite.com,lemmy.iswhereits.at,lemmy.easfrq.live,lemmy.friheter.com,lmy.rndmm.us,kbin.korgen.xyz
This gave good results, way less active workers, so less timeouts. (I see that above 3000 active workers, timeouts start).
(If you own one of these servers, let me know once it's back up, so I can un-block it)
Now it's after midnight so I'm going to bed. Surely more troubleshooting will follow tomorrow and in the weekend.
Please let me know if you see improvements, or have many issues still.
How are you monitoring this? Was it just a good peek at nginx log or something else, greylog?
I just grep'd the nginx access log for the lemmy.world IP address and looked at the access times. you can see if it's timing out is the response code is 400. sadly ~57% of the requests are currently timing out today. it seems to work for a bit then time out for about 10 minutes, at least there is some coming through now, before the requests had stopped completely.
lemmy.ml is also back in my logs. yay
lemmy.ml is almost perfect on the timeouts, so they must have managed to fix it.