The RuntimeClass alpha feature enables a node to surface multiple runtime options to support a variety of workload types.  Examples include native linux containers, and “sandboxed” containers that isolate the container from the host kernel.

- SCTP support in API objects (Pod, Service, NetworkPolicy) is now GA.
  Note that this has no effect on whether SCTP is enabled on nodes at the kernel level,
  and note that some cloud platforms and network plugins do not support SCTP traffic. ([#95566](https://github.com/kubernetes/kubernetes/pull/95566), [@danwinship](https://github.com/danwinship)) [SIG Apps and Network]

- Handle Windows named pipes in host mounts. ([#69484](https://github.com/kubernetes/kubernetes/pull/69484), [@ddebroy](https://github.com/ddebroy))
- Fixed inconsistency in windows kernel proxy when updating HNS policy. ([#68923](https://github.com/kubernetes/kubernetes/pull/68923), [@delulu](https://github.com/delulu))

##  External Dependencies

  * Upgrade Node Problem Detector to v0.4.1. New features added:

    * Add /dev/kmsg support for kernel log parsing. ([#112](https://github.com/kubernetes/node-problem-detector/pull/112), [@euank](https://github.com/euank))

- Kubeadm: switched the validation check for Linux kernel version to throw warnings instead of errors. ([#131919](https://github.com/kubernetes/kubernetes/pull/131919), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle and Node]

errors.failed_to_read_request_file=Fehler beim Lesen einer Anforderungsdatei: {0}
errors.invalid_header_for_request_file=Ungültige Header-Zeile: {0}
errors.could_not_delete_logged_in_user=Sie können keinen angemeldeten Benutzer löschen.
errors.unauthorized_request=Unautorisierte Anfrage.
errors.failed_to_print_thread_dump=Fehler beim Drucken eines Thread-Dumps.
errors.file_is_not_supported={0} wird nicht unterstützt.

- kubeadm will now not fail preflight checks when running on >= 5.0 Linux kernel ([#74355](https://github.com/kubernetes/kubernetes/pull/74355), [@brb](https://github.com/brb))

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- kubeadm: implement support for concurrent add/remove of stacked etcd members ([#79677](https://github.com/kubernetes/kubernetes/pull/79677), [@neolit123](https://github.com/neolit123))
- kubeadm: support any Linux kernel version newer than 3.10 ([#81623](https://github.com/kubernetes/kubernetes/pull/81623), [@neolit123](https://github.com/neolit123))

- Changes behaviour of kube-proxy start; does not attempt to set specific `sysctl` values (which does not work in recent Kernel versions anymore in non-init namespaces), when the current sysctl values are already set higher. ([#103174](https://github.com/kubernetes/kubernetes/pull/103174), [@Napsty](https://github.com/Napsty))