This is really awesome, distributed system techniques in the real world. I'm really jealous of what they've managed to build.

I was planning to make a tool like this (smaller scale, one machine), and this will certainly serve as a good guide on how to do it right (or whether I should even bother at all).

I can't find a trace of a standard/included slick web interface for managing the clusters and agents -- are they leaving this up to a 3rd party (by just providing the HTTP API and seeing what people will do with it)? Is that a good idea?