### Feature

- A client-go metric, rest_client_exec_plugin_call_total, has been added to track total calls to client-go credential plugins. ([#98892](https://github.com/kubernetes/kubernetes/pull/98892), [@ankeesler](https://github.com/ankeesler)) [SIG API Machinery, Auth, Cluster Lifecycle and Instrumentation]

* APIserver backed by etcdv3 exports metric shows number of resources per kind. ([#59757](https://github.com/kubernetes/kubernetes/pull/59757), [@gmarek](https://github.com/gmarek))

- Fix a bug in cronjob controller where already created jobs...

In addition, support for NVMe disks has been added to Kubernetes, and a service of type LoadBalancer can now be backed with an NLB instead of an ELB (alpha).

### Azure

SIG Azure worked on improvements in the cloud provider, including significant work on the Azure Load Balancer implementation.

### Cluster Lifecycle

- Kubeadm now includes CoreDNS version 1.6.7 ([#86260](https://github.com/kubernetes/kubernetes/pull/86260), [@rajansandeep](https://github.com/rajansandeep)) [SIG Cluster Lifecycle]
- Kubeadm upgrades always persist the etcd backup for stacked ([#86861](https://github.com/kubernetes/kubernetes/pull/86861), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

 - Fix: support removal of nodes backed by deleted non VMSS instances on Azure ([#91184](https://github.com/kubernetes/kubernetes/pull/91184), [@bpineau](https://github.com/bpineau)) [SIG Cloud Provider]

* Registries backed by the generic Store's `Update` implementation support delete-on-update, which allows resources to be automatically deleted during an update provided: ([#48065](https://github.com/kubernetes/kubernetes/pull/48065), [@ironcladlou](https://github.com/ironcladlou))...

- Added support for projected volume in describe function  ([#70158](https://github.com/kubernetes/kubernetes/pull/70158), [@WanLinghao](https://github.com/WanLinghao))
- kubeadm now automatically creates a new stacked etcd member when joining a new control plane node (does not applies to external etcd) ([#69486](https://github.com/kubernetes/kubernetes/pull/69486), [@fabriziopandini](https://github.com/fabriziopandini))

Other then that, this release contains no other changes from 1.5.4.

The vulnerability is tracked in http://issue.k8s.io/43459.

**Who is affected?**

Only Kubernetes 1.5.0-1.5.4 installations that do all of the following:
* Enable the PodSecurityPolicy API (which is not enabled by default):

- Replace `go-bindata` with `//go:embed`. ([#99829](https://github.com/kubernetes/kubernetes/pull/99829), [@palnabarun](https://github.com/palnabarun))
- The `DynamicFakeClient` now exposes its tracker via a `Tracker()` function. ([#100085](https://github.com/kubernetes/kubernetes/pull/100085), [@markusthoemmes](https://github.com/markusthoemmes))