Hello,
I've been reading the autovacuum code (the launcher and the worker) on the 14 branch. As previously, I've seen some configuration at the beginning, especially for statement_timeout, lock_timeout and idle_in_transaction_session_timeout, and I was surprised to discover there was no configuration for idle_session_timeout. I'm not sure the code should set it to 0 as well (otherwise I'd have written a patch), but, if there was a decision made to ignore its value, I'd be interested to know the reason. I could guess for the autovacuum worker (it seems to work in a transaction, so it's already handled by the idle_in_transaction_timeout), but I have no idea for the autovacuum launcher.
If it was just missed, I could write a patch this week to fix this.
Regards.