What is the "apache restart interval" referred to in Server > Server preferences? I had been under the impression that Plesk is supposed to restart apache periodically, according to the number of seconds entered in this field, but that doesn't seem to be the case, at least under 7.5.2. I've looked at this on four different installs of Plesk, all with the interval set to 900, and on all of them httpd has been running for hours, days, or weeks without a restart (both according to 'ps' and to the mod_status-generated server-status page). So what's it actually for? Or is this feature just broken?