"primary IP family" of the cluster by picking a primary pod IP of the same family
  as the (primary) node IP, rather than assuming that the CNI plugin returned the IPs
  in the order the administrator wanted (since some CNI plugins don't allow
  configuring this). ([#97979](https://github.com/kubernetes/kubernetes/pull/97979), [@danwinship](https://github.com/danwinship)) [SIG Network and Node]

    * possible to update the spec field of an existing
    * NetworkPolicy. (Previously you had to delete and recreate a
    * NetworkPolicy if you wanted to change it.)
* Fix udp service blackhole problem when number of backends changes from 0 to non-0 ([#48524](https://github.com/kubernetes/kubernetes/pull/48524), [@freehan](https://github.com/freehan))