/var/www/vendor/symfony/http-foundation/Session/Storage/Handler/PdoSessionHandler.php: 667 - SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction
URL: https://xtools.wmcloud.org/ec/ja.wikivoyage.org
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XTools version: 3.17.9-a8eac612
This one actually is different from the issue with the replicas. Sessions are stored in a Trove database, which is separate from tools-db and the replicas. I've been seeing this error a lot since we made the change to shared session storage about a month ago. This is the first time however I've seen confirmation that it's actually effecting end users... so I will try to prioritize fixing this.
Oh, sorry, my bad. There's been a lot of redundant reports lately and I saw the HY000 error which had appeared in some other reports too, but thanks for fixing my mistake.
No worries, and thank you for closing the duplicates! If it's something database related, it's probably safe to close as a duplicate unless you see PdoSessionHandler or tools.db.svc.wikimedia.cloud.
Come to think of it, while this error was happening prior to the replicas maintenance, it could be exasperated by it. Queries seem to be much slower right now, meaning the connection to the sessions database needs to stay alive longer, too. This is only a theory, but I think it makes sense.