We've recently had some false positives where our monitoring alerted us that Apache or nginx were down when they were in fact running and working as expected.

Further investigation showed that Zabbix incorrectly discovered auxiliary processes named "nginx_control" or "libapache2-mod-" and was alerting because these were not running. (see screenshots)

Suggested fix:

• change {$APACHE.PROCESS_NAME} to ^(httpd|apache2)$
• change {$NGINX.PROCESS_NAME} to ^nginx$