Fair warning: Installing zipkin is non-trivial. You're basically deploying a whole subsystem from the twitter infrastructure designed to handle more data than most of websites on the internet. Here's the instructions:
There is no out-of-the-box tracing for django, but there is limited instrumentation of python by a third-party system written by rackspace:
https://github.com/racker/tryfer
Sadly, I don't have any documentation on how to use it, and github is giving me troubles at the moment.
cheers
-bmd