The packaged Zenoss for Debain will monitor httpd out of the box but does not look for the apache2 process.
To monitor Apache 2.2, you need to add a similar Processes class as httpd has. Navigate to Processes>Apache and then select Add process. Type apache2 as an ID (it’s just a unique identifier) and select OK.
Under the Edit tab, type apache2 for the Name and ^.*\/*apache2 as the RegEx. That should be all you need.
To start monitoring a device, just remodel it manually or wait for a day or so for remodelling to happen on all your devices for Apache 2.2 to start to be monitored.
Thanks man, works great!
Hopefully there is a trac ticket on this so that they get this fixed in 3.0
Cheers!