coreos/etcd — pull request #1187 by jonboulle (2014-09-26 18:35:12+00:00)
Title: Watches do not return X-Etcd-Index header

This is not necessarily a problem as it's unclear what value it should be. It can be current etcd index or it can be the index of the event being returned. Maybe it should not be returned.

However this does break compatibility with 0.4.6.