Gstats is a ZeroMQ based statistics gathering application suited for web apps.
It was initially built for gunicorn, but it can be easily hooked into anything
that provides pre and post request hooks.

The app provides an arbitrary number of counters which are returned as a dict
or whatever the calling language names a hash table; request times can also be
sent, and gstats will compute averages and standard deviation

Two munin plug-in scripts (graphing requests/second and request times) and a small WSGI application that returns the data as JSON are also included.