As far as platforms, working with SIG-Windows, enhancements were made to the kubelet to improve platform support on Windows operating systems, and improvements to resource management were also made.  In particular, support for sysctls on Linux graduated to beta.

### SIG OpenStack

  - `timeout` default changed from `30s` to `10s` for v1
  - `sideEffects` default value is removed, and the field made required, and only `None` and `NoneOnDryRun` are permitted for v1
  - `admissionReviewVersions` default value is removed and the field made required for v1 (supported versions for AdmissionReview are `v1` and `v1beta1`)

- Defaults for file audit logging backend in batch mode changed: ([#67223](https://github.com/kubernetes/kubernetes/pull/67223), [@tallclair](https://github.com/tallclair))

- `kubeadm join --experimental-control-plane` now automatically adds a new etcd member for `local etcd` mode, further simplifying required tasks for HA clusters setup.
- Improvements were made to `kubeadm reset` related to cleaning  etcd and notifying the user about the state of iptables.
- kubeadm commands now print warnings if input YAML documents contain unknown or duplicate fields.

  Previously, when unschedulable Pods are updated, the scheduler always put Pods back to activeQ/backoffQ. But, actually not all updates to Pods make Pods schedulable, especially considering many scheduling constraints nowadays are immutable.

- Made `apiextensions-apiserver` binary linking static (also affects the deb and rpm packages). ([#114226](https://github.com/kubernetes/kubernetes/pull/114226), [@saschagrunert](https://github.com/saschagrunert))

- Kubeadm: fix a regression in "kubeadm init" that caused a user-specified --kubeconfig file to be ignored. ([#122735](https://github.com/kubernetes/kubernetes/pull/122735), [@avorima](https://github.com/avorima)) [SIG Cluster Lifecycle]

[SIG Storage](https://github.com/kubernetes/community/tree/master/sig-storage) is responsible for storage and volume plugin components.

- Made kubelet's /metrics/slis endpoint always available. ([#128430](https://github.com/kubernetes/kubernetes/pull/128430), [@richabanker](https://github.com/richabanker)) [SIG Architecture, Instrumentation and Node]

Call             Type T            Result

make(T, n)       slice             slice of type T with length n and capacity n
make(T, n, m)    slice             slice of type T with length n and capacity m

make(T)          map               map of type T
make(T, n)       map               map of type T with initial space for approximately n elements

make(T)          channel           unbuffered channel of type T