- When registering with a 1.17+ API server, a CustomResourceDefinition conversion webhook can now request that only `v1` ConversionReview requests be sent to them. Previously, conversion webhooks were required to support receiving `v1beta1` ConversionReview requests as well for compatibility...

- Fix a bug where events/v1 Events with similar event type and reporting instance were not aggregated by client-go. ([#112365](https://github.com/kubernetes/kubernetes/pull/112365), [@dgrisonnet](https://github.com/dgrisonnet)) [SIG API Machinery and Instrumentation]

- Kubeadm: Fixed a bug where the PublicKeysECDSA feature gate was not respected when generating kubeconfig files. ([#125388...

- Fixed a bug where the CPU set allocated to an init container, with containerRestartPolicy of `Always`, were erroneously reused by a regular container. ([#119447](https://github.com/kubernetes/kubernetes/pull/119447), [@gjkim42](https://github.com/gjkim42)) [SIG Node and Testing]

   ([#123273](https://github.com/kubernetes/kubernetes/pull/123273), ...

* The following deprecated flags were removed from `kube-controller-manager`:

  * `replication-controller-lookup-cache-size`
  * `replicaset-lookup-cache-size`
  * `daemonset-lookup-cache-size`

  Don't use these flags. Using deprecated flags causes the server to print a warning. Using a removed flag causes the server to abort the startup.

* The following deprecated flags were removed from `kubelet`:

  managed by the GLBC Ingress Controller. This can cause the health checks to start failing,
  requiring you to reapply the manual edits.
  * This issue does not affect clusters that were already running Kubernetes v1.6.4 or higher.
  * This issue does not affect Health Checks that were left in the configuration
    [originally set by the GLBC Ingress Controller](https://github.com/kubernetes/ingress-nginx/tree/0.9.0-beta.1/controllers/gce#health-checks).

- Fix static pod restarts in cases where the container is not present. ([#108189](https://github.com/kubernetes/kubernetes/pull/108189), [@rphillips](https://github.com/rphillips)) [SIG Node]

- Fix to recover CSI volumes from certain dangling attachments ([#96617](https://github.com/kubernetes/kubernetes/pull/96617), [@yuga711](https://github.com/yuga711)) [SIG Apps and Storage]
- Fixed a bug where aggregator_unavailable_apiservice metrics were reported for deleted apiservices. ([#96421](https://github.com/kubernetes/kubernetes/pull/96421), [@dgrisonnet](https://github.com/dgrisonnet)) [SIG API Machinery and Instrumentation]

* Fix a bug in GCE multizonal clusters where PersistentVolumes were sometimes created in zones without nodes. ([#52322](https://github.com/kubernetes/kubernetes/pull/52322), [@davidz627](https://github.com/davidz627))
* Fix validation of NetworkPolicy ([#56223](https://github.com/kubernetes/kubernetes/pull/56223), [@deads2k](https://github.com/deads2k))