You can enable the extended status feature of apache which will show that information.
For example, adding this to your httpd.conf and restarting apache.
Then going to serverip/server-status should show you the stats your looking for.
Code:
ExtendedStatus On
<Location /server-status>
SetHandler server-status
</Location>
There is also the Domain Monitor tool which can be found in the 3rd Party forums which will parse that page every so often and put everything in a MySQL database for easier interpreting.