- In dual-stack bare-metal clusters, you can now pass dual-stack IPs to `kubelet --node-ip`.
  eg: `kubelet --node-ip 10.1.0.5,fd01::0005`. This is not yet supported for non-bare-metal
  clusters.
  
  In dual-stack clusters where nodes have dual-stack addresses, hostNetwork pods

* Bump up version number of debian-base, debian-hyperkube-base and debian-iptables.  ([#67026](https://github.com/kubernetes/kubernetes/pull/67026), [@satyasm](https://github.com/satyasm))
    * Also updates dependencies of users of debian-base.
    * debian-base version 0.3.1 is already available.

For more information, see [#53040](https://github.com/kubernetes/kubernetes/issues/53040).

With Kubernetes 1.15 as beta, OpenAPI schemas are also published for CRDs, as long as their schemas are structural.

These changes are reflected in the following Kubernetes enhancements:

* Bump up version number of debian-base, debian-hyperkube-base and debian-iptables.  ([#67026](https://github.com/kubernetes/kubernetes/pull/67026), [@satyasm](https://github.com/satyasm))
    * Also updates dependencies of users of debian-base.
    * debian-base version 0.3.1 is already available.

* Bump up version number of debian-base, debian-hyperkube-base and debian-iptables.  ([#67026](https://github.com/kubernetes/kubernetes/pull/67026), [@satyasm](https://github.com/satyasm))
    * Also updates dependencies of users of debian-base.
    * debian-base version 0.3.1 is already available.

### Feature

- Base image updates to mitigate kube-proxy and etcd container image CVEs
  - debian-base to buster-v1.6.0
  - debian-iptables to buster-v1.6.0 ([#100976](https://github.com/kubernetes/kubernetes/pull/100976), [@jindijamie](https://github.com/jindijamie)) [SIG Release and Testing]

 - Scheduling failures due to no nodes available are now reported as unschedulable under ```schedule_attempts_total``` metric. ([#90989](https://github.com/kubernetes/kubernetes/pull/90989), [@ahg-g](https://github.com/ahg-g)) [SIG Scheduling]

### Other (Cleanup or Flake)
 - base-images: Use debian-base:v2.1.0 (update to Debian Buster, includes CVE fixes)

* Bump up version number of debian-base, debian-hyperkube-base and debian-iptables.  ([#67026](https://github.com/kubernetes/kubernetes/pull/67026), [@satyasm](https://github.com/satyasm))
    * Also updates dependencies of users of debian-base.
    * debian-base version 0.3.1 is already available.

* Use debian-base instead of busybox as base image for server images ([#70245](https://github.com/kubernetes/kubernetes/pull/70245), [@ixdy](https://github.com/ixdy))