- Kubelet: the connection to a DRA driver became unusable because of an internal deadlock when a connection was idle for 30 minutes. ([#133934](https://github.com/kubernetes/kubernetes/pull/133934), [@pohly](https://github.com/pohly)) [SIG Node]

- CephFS volume plugin ( `kubernetes.io/cephfs`) was removed in this release and the `cephfs` volume type became non-functional. Alternative is to use CephFS CSI driver (https://github.com/ceph/ceph-csi/) in your Kubernetes Cluster. A re-deployment of your application is required to use the new driver if you were using `kubernetes.io/cephfs` volume plugin before...

## Urgent Upgrade Notes 

### (No, really, you MUST read this before you upgrade)

- 'The `IPv6DualStack` feature gate for external cloud providers was removed.
  (The feature became GA in 1.23 and the gate was removed for all other
  components several releases ago.) If you were still manually

   ([#123341](https://github.com/kubernetes/kubernetes/pull/123341), [@neoli...

- DRA: when the scheduler had to deallocate a claim after a node became unsuitable for a pod, it might have needed more attempts than really necessary. This was fixed by first disabling allocations. ([#120428](https://github.com/kubernetes/kubernetes/pull/120428), [@pohly](https://github.com/pohly))

- Pods were allowed to use the `net.ipv4.tcp_rmem` and `net.ipv4.tcp_wmem` sysctl by default
  when the kernel version was 4.15 or higher. With the kernel 4.15 the sysctl became namespaced.

* Fixes possible panic during volume detach, if corresponding volume plugin became non-attachable ([#71471](https://github.com/kubernetes/kubernetes/pull/71471), [@mshaverdo](https://github.com/mshaverdo))

- Kubelet: the connection to a DRA driver became unusable because of an internal deadlock when a connection was idle for 30 minutes. ([#133926](https://github.com/kubernetes/kubernetes/pull/133926), [@pohly](https://github.com/pohly)) [SIG Node]

* Fixes possible panic during volume detach, if corresponding volume plugin became non-attachable ([#71471](https://github.com/kubernetes/kubernetes/pull/71471), [@mshaverdo](https://github.com/mshaverdo))

SIG CLI introduces kubectl debug

SIG CLI was debating the need for a debug utility for quite some time already. With the development of [ephemeral containers](https://kubernetes.io/docs/concepts/workloads/pods/ephemeral-containers/), it became more obvious how we can support developers with tooling built on top of `kubectl exec`. The addition of the `kubectl debug` [command](https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/1441-kubectl-debug/README.md) (it is alpha but...