Here are the prerequisites for monitoring Apache server with the checkpoints:
On the Apache server activate the mod-status with the command:
a2enmod status
Restart or reload Apache as necessary.
To limit access to information in your domain (eg example.com), add the following code to the Apache configuration file httpd.conf or apache2.conf:
<Location / server-status>
SetHandler server-status
Order Deny, Allow
Deny from all
Allow from .example.com
</ Location>
You can now access your Apache usage statistics here.
Resources: http://httpd.apache.org/docs/2.2/mod/mod_status.html
