- Added support for a new kubectl output format, `kyaml`. KYAML was a strict subset of YAML and should be accepted by any YAML processor. The formatting of KYAML was halfway between JSON and YAML.  Because it was more explicit than the default YAML style, it was less error-prone. ([#132942](https://github.com/kubernetes/kubernetes/pull/132942), [@thockin](https://github.com/thockin)) [SIG API Machinery,...

* Check for known manifests during preflight instead of only checking for non-empty manifests directory. This makes the preflight checks less heavy-handed by specifically checking for well-known files (kube-apiserver.yaml, kube-controller-manager.yaml, kube-scheduler.yaml, etcd.yaml) in /etc/kubernetes/manifests instead of simply checking for a non-empty directory. ([#57287](https://github.com/kubernetes/kubernetes/pull/57287), [@mattkelly](https://github.com/mattkelly))

- go.uber.org/multierr: v1.1.0 → v1.5.0
- go.uber.org/zap: v1.10.0 → v1.16.0
- gopkg.in/yaml.v3: 9f266ea → eeeca48
- k8s.io/kube-openapi: 591a79e → 9528897
- sigs.k8s.io/kustomize/api: v0.8.5 → v0.8.8
- sigs.k8s.io/kustomize/cmd/config: v0.9.7 → v0.9.10
- sigs.k8s.io/kustomize/kustomize/v4: v4.0.5 → v4.1.2
- sigs.k8s.io/kustomize/kyaml: v0.10.15 → v0.10.17
- sigs.k8s.io/structured-merge-diff/v4: v4.1.0 → v4.1.1

### Removed

- sigs.k8s.io/kustomize/api: 6ce0bf3 → v0.17.2
- sigs.k8s.io/kustomize/cmd/config: v0.11.2 → v0.14.1
- sigs.k8s.io/kustomize/kustomize/v5: 6ce0bf3 → v5.4.2
- sigs.k8s.io/kustomize/kyaml: 6ce0bf3 → v0.17.1
- sigs.k8s.io/yaml: v1.3.0 → v1.4.0

### Removed
- github.com/GoogleCloudPlatform/k8s-cloud-provider: [f118173](https://github.com/GoogleCloudPlatform/k8s-cloud-provider/tree/f118173)

- sigs.k8s.io/kustomize/api: v0.18.0 → v0.19.0
- sigs.k8s.io/kustomize/cmd/config: v0.15.0 → v0.19.0
- sigs.k8s.io/kustomize/kustomize/v5: v5.5.0 → v5.6.0
- sigs.k8s.io/kustomize/kyaml: v0.18.1 → v0.19.0
- sigs.k8s.io/structured-merge-diff/v4: v4.4.2 → v4.6.0

### Removed
- github.com/asaskevich/govalidator: [f61b66f](https://github.com/asaskevich/govalidator/tree/f61b66f)

_Nothing has changed._

### Changed
- sigs.k8s.io/kustomize/api: v0.8.5 → v0.8.8
- sigs.k8s.io/kustomize/cmd/config: v0.9.7 → v0.9.10
- sigs.k8s.io/kustomize/kustomize/v4: v4.0.5 → v4.1.2
- sigs.k8s.io/kustomize/kyaml: v0.10.15 → v0.10.17

### Removed
_Nothing has changed._



# v1.21.0

[Documentation](https://docs.k8s.io)

## Downloads for v1.21.0

### Source Code

### Other notable changes

* Fix aggressive VM calls for Azure VMSS ([#83102](https://github.com/kubernetes/kubernetes/pull/83102), [@feiskyer](https://github.com/feiskyer))

		* `kubectl version` has new flag --output (=json or yaml) allowing result of the command to be parsed in either json format or yaml. ([#39858](https://github.com/kubernetes/kubernetes/pull/39858), [@alejandroEsc](https://github.com/alejandroEsc))


  * Bug fixes

- Fix unsafe JSON construction in a number of locations in the codebase ([#81158](https://github.com/kubernetes/kubernetes/pull/81158), [@zouyee](https://github.com/zouyee))

* Fix aggressive VM calls for Azure VMSS ([#83102](https://github.com/kubernetes/kubernetes/pull/83102), [@feiskyer](https://github.com/feiskyer))