it’s a little funny to think that if you’re running ZooKeeper in Kubernetes that you’re using etcd to manage the state of the servers of your state management servers
In context of Kafka, hopefully KIP-500 [1] will get implemented sometime soon.
If you're feeling lucky, you can also use zetcd [2] to connect ZK apps to etcd. I've been able to actually run Kafka with it as a toy project a little while ago.
[1] https://cwiki.apache.org/confluence/display/KAFKA/KIP-500%3A...