pam_unix(su:session) opened for user postgres every 5 minutes

Every 5 minutes I get this:

Aug 24 17:05:55 islamorada su: pam_unix(su:session): session opened for user postgres by (uid=0)
Aug 24 17:05:55 islamorada su: pam_unix(su:session): session closed for user postgres

ran crontab -e and it looks like only /etc/webmin/status/monitor.pl is running every 5 minutes, and postgres is not running at all on my server.

Looked at monitor.pl and not don’t see anything obvious that would make this call.

Just curious, what’s it doing?

Thanks!

see Webmin -> Others -> System and Server Status

disable/delete services which aren’t being used

and schedule how often the monitoring is run