- Fixed a regression since 1.24 in the scheduling framework when overriding MultiPoint plugins (e.g. default plugins).
  The incorrect loop logic might lead to a plugin being loaded multiple times, consequently preventing any Pod from being scheduled, which is unexpected. ([#122368](https://github.com/kubernetes/kubernetes/pull/122368), [@caohe](https://github.com/caohe)) [SIG Scheduling]

### Other (Cleanup or Flake)

PersistentVolumeClaim.
  * Run multiple schedulers in parallel, e.g. one or more custom schedulers
alongside the default Kubernetes scheduler, using pod annotations to select
among the schedulers for each pod. Documentation is [here](http://kubernetes.io/docs/admin/multiple-schedulers.md), design doc is [here](docs/proposals/multiple-schedulers.md).

### Other notable changes

* The kube-apiserver --service-account-key-file option can be specified multiple times, or can point to a file containing multiple keys, to enable rotation of signing keys. ([#34029](https://github.com/kubernetes/kubernetes/pull/34029), [@liggitt](https://github.com/liggitt))

### Scheduling

- Multiple Kubernetes clusters can now share the same resource group
    - When upgrading from previous releases, issues will arise with public IPs if multiple clusters share the same resource group. To solve these problems, make the following changes to the cluster:

- Adding support for multiple `--from-env-file flags`. ([#104232](https://github.com/kubernetes/kubernetes/pull/104232), [@lauchokyip](https://github.com/lauchokyip))
- Adding support for multiple `--from-env-file` flags. ([#101646](https://github.com/kubernetes/kubernetes/pull/101646), [@lauchokyip](https://github.com/lauchokyip))

  
  ### Magnum
  - Add Magnum support in the Cluster Autoscaler helm chart
  
  ### Packet
  - Allow empty nodepools
  - Add support for multiple nodepools
  - Add pricing support
  
  ## Image

### SIG Windows development tools

To grow the developer community, SIG Windows  released multiple [tools](https://github.com/kubernetes-sigs/sig-windows-dev-tools/). The new tools support multiple CNI providers (Antrea, Calico), can run on multiple platforms (any vagrant compatible provider, such as Hyper-V, VirtualBox, or vSphere).

- Kube-apiserver: multiple comma-separated protocols in a single X-Stream-Protocol-Version header are now recognized, in addition to multiple headers, complying with RFC2616 ([#89857](https://github.com/kubernetes/kubernetes/pull/89857), [@tedyu](https://github.com/tedyu)) [SIG API Machinery]

disabled by default). An API server fronted by an L7 load balancer that already mitigates these http/2 attacks may choose not to enable the kube-apiserver mitigation to avoid disrupting load balancer → kube-apiserver connections if http/2 requests from multiple clients share the same backend connection. An API server on a private network may choose not to enable the kube-apiserver mitigation to prevent performance regressions for unauthenticated clients. Authenticated requests rely on the fix in golang.org/x/net...