The Apache module allows you to track and monitor Apache CPU usage on your server. It does this by parsing the extended Apache server-status data and recording this information for display in the LoadAvg charting module as seen below.
Apache Load Settings
You can configure the Apache module via is settings on the module settings page. There you can set a few variables to help you with the display of your data as seen below.
Overload : Not currently used
Serverstatus : the location of your servers server-status page
Display Limiting : Not currently used
The main item here is the Serverstatus value. This tells loadavg where to find your servers server-status page so it can get and parse Apache metrics. It should be something like this:
http://localhost/server-status
Setting up Apache server-status
LoadAvg uses the extended server status data, so this will also need to be activated. For instructions on how to set up Apache server-status on CentOS or Fedora you can follow this link
http://www.loadavg.com/2014/11/enabling-apache-extended-status-on-centos-servers/
For instructions on how to set up Apache server-status on Ubuntu servers you can follow this link
http://articles.slicehost.com/2010/3/26/enabling-and-using-apache-s-mod_status-on-ubuntu