To set up a php-fpm status page for the domain do the following.
Create /var/www/vhosts/system/domain.net/conf/php.ini and add this into it:
[php-fpm-pool-settings] pm.status_path = /status
In the Additional nginx directives section for that domain add this:
location ~ ^/status$ {
allow 127.0.0.1;
deny all;
fastcgi_split_path_info ^((?U).+\\.php)(/?.+)$;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_pass "unix:///var/www/vhosts/system/pac.domain.net/php-fpm.sock";
include /etc/nginx/fastcgi.conf;
}