Justin King <kingpin867@gmail.com> writes:
> We've seen unexpected termination of the WAL receiver process. This
> stops streaming replication, but the replica stays available --
> restarting the server resumes streaming replication where it left off.
> We've seen this across nearly every recent version of PG, (9.4, 9.5,
> 11.x, 12.x) -- anything omitted is one we haven't used.
> I don't have an explanation for the cause, but I was able to set
> logging to "debug5" and run an strace of the walrecevier PID when it
> eventually happened. It appears as if the SIGTERM is coming from the
> "postgres: startup" process.
The startup process intentionally SIGTERMs the walreceiver under
various circumstances, so I'm not sure that there's any surprise
here. Have you checked the postmaster log?
regards, tom lane