I work at HubSpot (on Kafka) and so I was a "user" of this migration because kafka uses Zookeeper for coordination. Its pretty amazing how convenient Kube services made this whole transition and we actually learned a lot from this that we will likely end up applying similar strategies for migrating other services onto Kube. Allowing kube services to point to either external resources or pods/internal ones is a probably the best feature I have found in Kube so far (and there are a lot of great features)