The webservice process goes away, and the webapp returns a 500 − Internal Server Error. This happened twice in the last 24 hours.
Extract from error.log
2017-09-18 07:23:24: (mod_fastcgi.c.3002) backend is overloaded; we'll disable it for 1 seconds and send the request to another backend instead: reconnects: 1 load: 263 2017-09-18 07:23:26: (mod_fastcgi.c.2765) fcgi-server re-enabled: 0 /var/run/lighttpd/php.socket.heritage 2017-09-18 07:23:26: (mod_fastcgi.c.2765) fcgi-server re-enabled: 0 /var/run/lighttpd/php.socket.heritage 2017-09-18 07:23:52: (mod_fastcgi.c.3002) backend is overloaded; we'll disable it for 1 seconds and send the request to another backend instead: reconnects: 0 load: 263 2017-09-18 07:23:52: (mod_fastcgi.c.3002) backend is overloaded; we'll disable it for 1 seconds and send the request to another backend instead: reconnects: 1 load: 263 2017-09-18 07:23:53: (mod_fastcgi.c.3594) all handlers for /heritage/api/api.php?action=search&etc on .php are down. 2017-09-18 07:23:54: (mod_fastcgi.c.2765) fcgi-server re-enabled: 0 /var/run/lighttpd/php.socket.heritage 2017-09-18 07:23:54: (mod_fastcgi.c.2765) fcgi-server re-enabled: 0 /var/run/lighttpd/php.socket.heritage 2017-09-18 07:23:57: (mod_fastcgi.c.3002) backend is overloaded; we'll disable it for 1 seconds and send the request to another backend instead: reconnects: 0 load: 263 2017-09-18 07:23:57: (mod_fastcgi.c.3002) backend is overloaded; we'll disable it for 1 seconds and send the request to another backend instead: reconnects: 1 load: 263 2017-09-18 07:23:58: (server.c.1558) server stopped by UID = 0 PID = 0 2017-09-18 07:24:07: (log.c.164) server started