PG Bug reporting form <noreply@postgresql.org> writes:
> Last October 2nd the postgresql service shut down the database
> unexpectedly.
> We only have this entry in the log file. Please, is there any way to
> investigate the problem with so little information?
> 2022-10-02 04:33:18.884 CDT pid: [9246] db: user: id: 6231c4b5.241e
> sqlstate: 00000 > LOG: received immediate shutdown request
That is a commanded shutdown: something sent the postmaster process
a SIGQUIT signal. The cause is very unlikely to be within Postgres
itself. You should be thinking in terms of operator error or a
misbehaving administrative script.
regards, tom lane