I think the code behind this is ichnaea[1]. I've been reading the code in past few days and learning some stuff. (OK I learn a lot of things reading other's code on github.)

Off topic: I found ichnaea while looking for circusd[2] configuration for celery. Mozilla circus is a nice process (& socket) management tool.

[1] https://github.com/mozilla/ichnaea

[2] http://circus.readthedocs.org/en/0.9.2/