There is a standard apache configuration that can be loaded to monitor the load of the server. It must be set up in your httpd.conf, somewhat like the following.
ExtendedStatus On
<Location /server-status>
SetHandler server-status
Order deny,allow
Deny from all
Allow from all
</Location>
The extened status gives a cpu usage.
You can check out one I just set up here to see if it's what your looking for.
http://junction.org/server-status
Steve
www.walkertek.com