Are there any tools for monitoring individual Apache virtual hosts in real-time?

I'm looking for a way to monitor and record Apache traffic, separated by virtual host. I am currently using Munin to capture this and other data for the entire server however I can't seem to find a way to do this by vhost.

This link describes using a module called mod_watch which is apparently no longer in development:

http://www.freshnet.org/wordpress/2007/03/08/monitoring-apaches-virtualhost-with-munin/

The file that is listed as being compatible with Apache 2.x is reported to have problems with missing vhosts an reporting data correctly.

Does anyone know of a reliable way to determine real-time traffic per vhost? If I can find this it should be easy enough to write a new Munin plugin.

Edit:

What I'd really like to see is something similar to the Apache server-status scoreboard page with the number of connections / requests as that point in time separated by virtual host. This would give me the ability to check which vhost may be experiencing a spike in traffic in real time and would also provide the data needed for a Munin module (or some alternative performance monitoring / analysis system.)

mod_status already does that for you. You just have to make sure to use ExtendedStatus. To see an example how it'd look like, refer to apache.org's server-status page.

what about having each vhost log to its own files, and then running log analysis against that?

i realize that's not fully real-time, but i don't see why you couldn't have something analyze your files more frequently than every day.

you could even use something or write something to monitor the logs, in real time, and generate graphs and other statistical data, if you were so inclined.