## 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))

- 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

is. // // The output will be resized to the size of m and overwritten. // //go:norace func (out *Nat) Mod(x *Nat, m *Modulus) *Nat { out.resetFor(m) // Working our way from the most significant to the least significant limb, // we can insert each limb at the least significant position, shifting all // previous limbs left by _W. This way each limb will get shifted by the // correct number of bits. We can insert at least N - 1 limbs without // overflowing m. After that, we need to reduce every time...

  * Remove the `--enable-cri` flag. CRI is now the default, and the only way to integrate with Kubelet for the container runtimes.([#45194](https://github.com/kubernetes/kubernetes/pull/45194), [@yujuhong](https://github.com/yujuhong))

- The formerly publicly-available cAdvisor web UI that the kubelet started using `--cadvisor-port` has been entirely removed in 1.12. The recommended way to run cAdvisor if you still need it, is via a DaemonSet. ([#65707](https://github.com/kubernetes/kubernetes/pull/65707), [@dims](https://github.com/dims))

- 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>`.
  

The main themes of this release are:

- **Custom resources:** CRDs are in widespread use as a way to extend Kubernetes to persist and serve new resource types, and have been available in beta since the 1.7 release. The 1.16 release marks the graduation of CRDs to general availability (GA).

## 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.

### Other (Cleanup or Flake)

- "Removed the ability to run `kubectl exec [POD] [COMMAND]` without a `--` separator.
  The `--` separator has been recommended since the Kubernetes v1.18 release, which also deprecated the legacy way of invoking `kubectl exec`.