For reference, anomiebot is MySQL user s51055. I can reproduce the connection error with tools.legobot, which is s51043. It appears to affect all slices. But the tool I created on Wednesday, tools.tour-nyc (s55336) is not affected and can connect just fine.

The other two tools I have access to, oauth-hello-world (s51319) and mediawiki-mirror (s52152), both can connect with sql enwiki.

Just tried the following and had no issues (as tools.anomiebot and tools.legobot):

tools.anomiebot@tools-sgebastion-10:~$ id
uid=51055(tools.anomiebot) gid=51055(tools.anomiebot) groups=51055(tools.anomiebot)

tools.anomiebot@tools-sgebastion-10:~$ mysql --defaults-file=$HOME/replica.my.cnf -h enwiki.analytics.db.svc.wikimedia.cloud enwiki

...

tools.anomiebot@tools-sgebastion-10:~$ sql enwiki

MAybe it's already fixed? Can you retry and verify it works? Or paste the command that did not work for you?

Things I did last night when I was too sleepy to remember to log:

(on labstore1004)

maintain-dbusers harvest-replicas
/usr/local/sbin/maintain-dbusers delete tools.anomiebot

at the time it neither command seemed to make a difference.

AnomieBOT is working now. Logs seem to indicate it was fixed sometime after 2023-03-11 04:38:20.

It looks fixed to me as well. OK to close or is more investigation needed?