* federation-apiserver now supports NamespaceLifecycle admission control, which is enabled by default. Set the --admission-control flag on the server to change that.
* Configure webhook ([#30923](https://github.com/kubernetes/kubernetes/pull/30923), [@Q-Lee](https://github.com/Q-Lee))

- `apiserver_admission_webhook_admission_duration_seconds` buckets have been expanded, 25s is now the largest bucket size to match the webhook default timeout. ([#115802](https://github.com/kubernetes/kubernetes/pull/115802), [@logicalhan](https://github.com/logicalhan)) [SIG API Machinery and Instrumentation]

- Kube-apiserver can now specify `--authentication-token-webhook-version=v1` or `--authorization-webhook-version=v1` to use `v1` TokenReview and SubjectAccessReview API objects when communicating with authentication and authorization webhooks. ([#84768](https://github.com/kubernetes/kubernetes/pull/84768), [@liggitt](https://github.com/liggitt))...

- `discovery.k8s.io/v1beta1`...

### CVE-2021-25735: Validating Admission Webhook does not observe some previous fields

A security issue was discovered in kube-apiserver that could allow node
updates to bypass a Validating Admission Webhook. You are only affected
by this vulnerability if you run a Validating Admission Webhook for Nodes
that denies admission based at least partially on the old state of the
Node object.

- Kube-apiserver adds two new alpha metrics `conversion_webhook_request_total` and `conversion_webhook_duration_seconds` that allow users to monitor requests to CRD conversion webhooks, split by result, and failure_type (In case of failure). ([#118292](https://github.com/kubernetes/kubernetes/pull/118292), [@cchapla](https://github.com/cchapla))...

* Reduce memory utilization of admission webhook metrics by removing resource related labels. ([#69895](https://github.com/kubernetes/kubernetes/pull/69895), [@jpbetz](https://github.com/jpbetz))

* Fix kube-proxy hang due to panic when requesting a closed healthcheck. ([#46450](https://github.com/kubernetes/kubernetes/pull/46450), [@MrHohn](https://github.com/MrHohn))
* Fix Flexvolume/FC/ISCSI volumes not being mounted after Node reboot. ([#51985](https://github.com/kubernetes/kubernetes/pull/51985), [@chakri-nelluri](https://github.com/chakri-nelluri))



# v1.6.12

        * [Build a Secure Twilio Webhook with Python and FastAPI](https://www.twilio.com/blog/build-secure-twilio-webhook-python-fastapi)  by [Twilio](https://www.twilio.com).

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