Andrea Corbellini's answer explains you why it won't work with the tools you're using and how Virtual Hosting works. Here's the most simple way I can think of to get it done in Apache...

mod_status will help you out.

Disclaimer: I can't tell how this is done in Webmin - I use bare configuration files to set up servers. Here's just a basic overview of the steps.

It's a top-like tool, but represented as a web page. It lists the current state directly queried from Apache, so it's not depending on parsing log files like apachetop does.

1. Enable mod_status:

   
   
   

   sudo a2enmod status
   
   




2. Grant yourself access.

   
   
   
   
   
   • Open /etc/apache2/mods-enabled/status.conf and edit:
   
   
   • Set ExtendedStatus to On (optional, but more awesomeness and a little slower)
   
   

   • Within the <Location /server-status>, append your IP address to the line with the Allow directive. Example:

     
     
     

     Allow from 127.0.0.1 ::1 66.77.88.99
     
     

   
   



3. Restart Apache:

   
   
   

   sudo service apache2 restart
   
   




4. Enjoy the tool in your browser, for example: http://1.2.3.4/server-status

   
   
   

   It will look like this example screenshot.




5. Keep pressing F5 to get updates. Or get an awesome browser plugin and watch it being updated!

Webmin

addendum by the OP for future visitors

In Webmin, the basic steps about the Status module can be found here:

• Servers -> Apache Webserver -> Configure Apache Modules


• Select the Status module and click click Enable Selected Modules