[Zope] changing Zope's logging

I need to change the logging so it reports our some additional infomration, but I'm having trouble localizing where the logging really happens. The new flexible logging system in Zope 2.6.2b3 makes it a bit difficult to find where the log entry is really constructed. The reason I need to change how logging work has to do with user tracking. In my new system setup, I have something akin to virtual hosting, but the vast majority of the site is shared. Multiple urls funnel into the same zope instance (that is, 127.0.0.1:<port>). I post process the usual Z2.log and need to have it reflect the original url source.