- Migrate cmd/kubelet/+ pkg/kubelet/cadvisor/cadvisor_linux.go + pkg/kubelet/cri/remote/util/util_unix.go + pkg/kubelet/images/image_manager.go to structured logging ([#99994](https://github.com/kubernetes/kubernetes/pull/99994), [@AfrouzMashayekhi](https://github.com/AfrouzMashayekhi)) [SIG Instrumentation and Node]

  - build: Use go-runner:buster-v2.0.1 (built using go1.15.1)
  - bazel: Replace --features with Starlark build settings flag
  - hack/lib/util.sh: some bash cleanups
    
    - switched one spot to use kube::logging
    - make kube::util::find-binary return an error when it doesn't find
      anything so that hack scripts fail fast instead of with "binary not
      found errors".

- Deprecated types in `k8s.io/apimachinery/util/clock`. Please use `k8s.io/utils/clock` instead. ([#106850](https://github.com/kubernetes/kubernetes/pull/106850), [@MadhavJivrajani](https://github.com/MadhavJivrajani))

- kubeadm: You can now delete multiple bootstrap tokens at once. ([#75646](https://github.com/kubernetes/kubernetes/pull/75646), [@bart0sh](https://github.com/bart0sh))
- util/initsystem: Added support for the OpenRC init system ([#73101](https://github.com/kubernetes/kubernetes/pull/73101), [@oz123](https://github.com/oz123))

* Move private key parsing from serviceaccount/jwt.go to client-go/util/cert ([#40907](https://github.com/kubernetes/kubernetes/pull/40907), [@cblecker](https://github.com/cblecker))

* Support vSphere SAML token auth when using Zones ([#75515](https://github.com/kubernetes/kubernetes/pull/75515), [@dougm](https://github.com/dougm))
* Fix empty array expansion error in cluster/gce/util.sh ([#76111](https://github.com/kubernetes/kubernetes/pull/76111), [@kewu1992](https://github.com/kewu1992))