* Rescheduler relies on taints, which were changed in a backward incompatible way. Rescheduler 0.3 shipped together with Kubernetes 1.6 understands the new taints and will clean up the old annotations, but Rescheduler 0.2 shipped together with Kubernetes 1.5 doesn't understand the new taints. In order to avoid eviction loop during 1.5->1.6 upgrade you need to either upgrade the master node atomically (for example by using `upgrade.sh` script for GCE) or...

- Added metrics `authentication_attempts` that can be used to understand the attempts of authentication. ([#81509](https://github.com/kubernetes/kubernetes/pull/81509), [@RainbowMango](https://github.com/RainbowMango))

- Kube-apiserver: Added metrics `authentication_latency_seconds` that can be used to understand the latency of authentication. ([#82409](https://github.com/kubernetes/kubernetes/pull/82409), [@RainbowMango](https://github.com/RainbowMango))

deployments`) and be called when any other version of that resource is modified (for example `extensions/v1beta1 deployments`). This allows new versions of a resource to be handled by admission webhooks without needing to update every webhook to understand the new version. See the API documentation for the `matchPolicy: Equivalent` option in MutatingWebhookConfiguration and ValidatingWebhookConfiguration types. ([#78135](https://github.com/kubernetes/kubernetes/pull/78135), [@liggitt](https://github.com/liggitt))...

- The `--bind-address` parameter in kube-proxy is misleading, no port is opened with this address. Instead it is translated...

- Adds the ability to pass --strict-transport-security-directives to the kube-apiserver to set the HSTS header appropriately.  Be sure you understand the consequences to browsers before setting this field. ([#96502](https://github.com/kubernetes/kubernetes/pull/96502), [@249043822](https://github.com/249043822)) [SIG Auth]

### Documentation

- Added a new internal metric `kubelet_first_network_pod_start_sli_duration_second` in the kubelet that allowed developers to understand the source of the latency problems on node startups.
   ([#121720](https://github.com/kubernetes/kubernetes/pull/121720), [@aojea](https://github.com/aojea))

- Graduated Job's `ManagedBy` field to beta. ([#127402]...

### SIG-storage

SIG Storage promoted the [Kubernetes volume topology feature](https://github.com/kubernetes/enhancements/issues/490) to beta. This enables Kubernetes to understand and act intelligently on volume accessibility information (such as the “zone” a cloud volume is provisioned in, the “rack” that a SAN array is accessible from, and so on).