How did you verify that, maybe some process started IO and stuck there? Can we check pg_stat_activity that is there some process that shows in the wait event as SLRURead/SLRUWrite and not coming out of that state?
There are no interesting entries in pg_stat_activity, and no wait events of those types DURING the problem periods (I poll this every 15s) .
It's an odd one.
- James
The contents of this email are confidential and may be subject to legal or professional privilege and copyright. No representation is made that this email is free of viruses or other defects. If you have received this communication in error, you may not copy or distribute any part of it or otherwise disclose its contents to anyone. Please advise the sender of your incorrect receipt of this correspondence.