### CSI Volume Snapshot graduates to General Availability

CSI Volume Snapshot moves to GA in the 1.20 release. This feature provides a standard way to trigger volume snapshot operations in Kubernetes and allows Kubernetes users to incorporate snapshot operations in a portable manner on any Kubernetes environment regardless of supporting underlying storage providers.

- Fixed a bug in the TopologyManager. Previously, the TopologyManager would only guarantee alignment if container creation was serialized in some way. Alignment is now guaranteed under all scenarios of container creation. ([#87759](https://github.com/kubernetes/kubernetes/pull/87759), [@klueska](https://github.com/klueska)) [SIG Node]

## Changelog since v1.4.0-alpha.3

### Experimental Features

* `kubeadm` (alpha) provides an easy way to securely bootstrap Kubernetes on Linux, see http://kubernetes.io/docs/kubeadm/ ([#33262](https://github.com/kubernetes/kubernetes/pull/33262), [@errordeveloper](https://github.com/errordeveloper))

SIG Network has graduated the widely used [Ingress API](https://kubernetes.io/docs/concepts/services-networking/ingress/) to general availability in Kubernetes 1.19. This change recognises years of hard work by Kubernetes contributors, and paves the way for further work on future networking APIs in Kubernetes.

### seccomp graduates to General Availability

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- CRD validation schemas should not specify `metadata` fields other than `name` and `generateName`. A schema will not be considered structural (and therefore ready for future features) if `metadata` is specified in any other way. ([#77653](https://github.com/kubernetes/kubernetes/pull/77653), [@sttts](https://github.com/sttts))

## Other notable changes

### API Machinery

TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. LICENSE_Scala SCALA LICENSE Copyright (c) 2002-2008 EPFL, Lausanne, unless otherwise specified. All rights reserved. This software was developed by the Programming Methods...

- Faster mount detection for linux kernel 5.10+ using openat2 speeding up pod churn rates. On Kernel versions less 5.10, it will fallback to using the original way of detecting mount points i.e by parsing /proc/mounts. ([#109217](https://github.com/kubernetes/kubernetes/pull/109217), [@manugupt1](https://github.com/manugupt1))

  Burstable QoS pods. For Best-Effort/Guaranteed QoS pods, swap would be disabled.
  
  Containers with memory requests equal to their memory limits also won't have
  swap access, and it is a way to opt-out of swap for a single container.
  
  The formula for the swap limit for Burstable QoS pods is:
  `(<memory-request>/<node-memory-capacity>)*<node-swap-capacity>`.
  

## Changelog since v1.30.0-alpha.3

## Changes by Kind

### API Change

- A new (alpha) field, `trafficDistribution`, has been added to the Service `spec`.
  This field provides a way to express preferences for how traffic is distributed to the endpoints for a Service.