=?utf-8?Q?R=C3=A9beli-Szab=C3=B3_Tam=C3=A1s?= <pub(at)rblst(dot)info> writes:
> I have noticed that a PostgreSQL 13 server went into recovery mode for 2
> seconds during normal operation, not at startup, preventing users from
> connecting.
The most obvious explanation is that a backend (or other postmaster
child process) crashed. I lack an explanation of why your log
trace doesn't show anything about that, but that seems like an
idea to pursue. What is the logging mechanism you're using?
regards, tom lane