Found it. Kubernetes cronjob task.
> On Feb 27, 2024, at 11:22 AM, Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:
>
> It could be autovacuum processing large tables that haven't been
> processed in a long time, in emergency mode. This happens if you turn
> it off and do nothing to substitute it.
We have autovacuum on, and pretty well tuned.
> Some backup tools implement parallel archiving of WAL files, which helps
> you deal with massive accumulation of them.
We'll get that in an upgrade we're getting ready to deploy. Ironically, it might have just hidden this problem ;-)
