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
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