1. Connect to the Plesk server via SSH.

2. Check if "status_module" is loaded:

   • for CentOS/RHEL-based distributions:

     # httpd -M | grep status
     status_module (shared)

   • for Debian/Ubuntu-based distributions:

     # apache2ctl -M | grep status
     status_module (shared)

     If the output is empty, enable the "status" module in Plesk at Tools & Settings > Apache Web Server.

3. Find out Apache version:

   • for CentOS/RHEL-based distributions:

     # httpd -v | grep version

   • for Debian/Ubuntu-based distributions:

     # apache2 -v | grep version

4. To make status reports visible to your IP address (from which you access this page in a browser), add the below code to the Apache configuration file (create a new file, if there is no):

   • CentOS/RHEL-based distributions:

         CentOS 7: /etc/httpd/conf.modules.d/status.conf
         CentOS 6: /etc/httpd/conf.d/status.conf

   • Debian/Ubuntu-based distributions: /etc/apache2/mods-enabled/status.conf

     In this example, we are allowing status reports to IP addresses 203.0.113.2 and 203.0.113.3:

     • for Apache 2.2:

       <IfModule mod_status.c>
       <Location /server-status>
       SetHandler server-status
       Order deny,allow
       Deny from all
       Allow from 203.0.113.2 203.0.113.3
       </Location>
       ExtendedStatus On
       </IfModule>

     • for Apache 2.4:

       <IfModule mod_status.c>
       <Location /server-status>
       SetHandler server-status
       <RequireAny>
       Require ip 203.0.113.2 203.0.113.3
       </RequireAny>
       </Location>
       ExtendedStatus On
       </IfModule>

5. Restart Apache web-server:

   • for CentOS/RHEL-based distributions:

     # service httpd restart

   • for Debian/Ubuntu-based distributions:

     # service apache2 restart

   Server statistics will now be available at http://your.server.ip.address/server-status

source: https://support.plesk.com/hc/en-us/articles/213922425-How-to-enable-the-Apache-server-statistics-on-a-Plesk-server