[Zope] Hooks for performance measurement

I would like to know the processing time and latency for each published object in my production Zope system. There are likely to be hooks in the system which can give me the access I need: I want to have my program get called when a threads begins to publish an object and again when a thread completes publication. I scanned the 2_6 documentation but did not find a list of hooks (something that perhaps ought to be there). Is there a list of hooks in the Zope code body and when they are called?