We have something very similar at Balanced called Rump (routing umpire). It's written in python has a pretty cool rule based engine and a swappable backend. It

We have something very similar at Balanced called Rump (routing umpire). It's written in python has a pretty cool rule based engine and a swappable backend. It currently uses ZK and Chef, but it would be pretty interesting to use something like Etcd/Consul since no one wants to maintain a ZK cluster. If there are individuals who want to hack on it, shoot me a msg on twitter and I'll see what I can do to speed up the process to open source it.