Health Monitor shows high Apache CPU/memory usage, though only nginx is used

Question

Why Health Monitor shows high Apache CPU/memory usage, though only nginx is used by the domains? 

Why Health Monitor shows high Apache CPU/memory usage, however 'top' utility shows high usage of PHP-FPM, not Apache?

Answer

The Health Monitor config file /etc/sw-collectd/conf.d/23process_Web.conf shows the following:

<Plugin processes>
    ProcessMatch "Web" "\/httpd|\/apache2|php-cgi|php-fpm|php5-fpm"
</Plugin>

<Plugin sw_mem>
    ProcessMatch "Web" "\/httpd|\/apache2|php-cgi|php-fpm|php5-fpm"
</Plugin>

It means that Health Monitor collects information about Apache, PHP-CGI and PHP-FPM and shows it in one section: Apache CPU Usage. So it does not matter whether PHP-FPM is served by Apache or nginx, Health Monitor will still show it in "Apache CPU Usage".