- kubelet
  - The deprecated `--experimental-fail-swap-on` flag has been removed ([#69552](https://github.com/kubernetes/kubernetes/pull/69552), [@Pingan2017](https://github.com/Pingan2017))

    * Bump metadata agent version to 0.2-0.0.21-1.
    * Expand the metadata agent's access to all API groups.
    * Remove metadata agent config maps in favor of command line flags.
    * Update the metadata agent's liveness probe to a new /healthz handler.
    * Logging Agent Improvements
    * Bump logging agent version to 0.2-1.5.33-1-k8s-1.
    * Appropriately set log severity for k8s_container.

* Set route_localnet on nodes & masters in GCE ([#55004](https://github.com/kubernetes/kubernetes/pull/55004), [@ihmccreery](https://github.com/ihmccreery))
* Configurable liveness probe initial delays for etcd and kube-apiserver in GCE ([#57749](https://github.com/kubernetes/kubernetes/pull/57749), [@wojtek-t](https://github.com/wojtek-t))

- Limit the body length of exec readiness/liveness probes. remote CRIs and Docker shim read a max of 16MB output of which the exec probe itself inspects 10kb. ([#82514](https://github.com/kubernetes/kubernetes/pull/82514), [@dims](https://github.com/dims))

  In addition, please be careful that:
  - kube-scheduler MUST start with `--authorization-kubeconfig` and `--authentication-kubeconfig` correctly set to get authentication/authorization working.
  - liveness/readiness probes to kube-scheduler MUST use HTTPS now, and the default port has been changed to 10259.

* Fixed incomplete kubectl bash completion. ([#31333](https://github.com/kubernetes/kubernetes/pull/31333), [@xingzhou](https://github.com/xingzhou))
* Added liveness probe to Heapster service. ([#31878](https://github.com/kubernetes/kubernetes/pull/31878), [@mksalawa](https://github.com/mksalawa))

* Fixed incomplete kubectl bash completion. ([#31333](https://github.com/kubernetes/kubernetes/pull/31333), [@xingzhou](https://github.com/xingzhou))
* Added liveness probe to Heapster service. ([#31878](https://github.com/kubernetes/kubernetes/pull/31878), [@mksalawa](https://github.com/mksalawa))

- kubeadm: switched the kube-scheduler static Pod to use the endpoints `/livez` (for startup and liveness probes) and `/readyz` (for the readiness probe). Previously, `/healthz` was used for all probes, which is deprecated behavior in the scope of this component. ([#126945](https://github.com/kubernetes/kubernetes/pull/126945), [@liangyuanpeng](http...

* GCE: Fixes ILB creation on automatic networks with manually created subnetworks. ([#57351](https://github.com/kubernetes/kubernetes/pull/57351), [@nicksardo](https://github.com/nicksardo))
* Configurable liveness probe initial delays for etcd and kube-apiserver in GCE ([#57749](https://github.com/kubernetes/kubernetes/pull/57749), [@wojtek-t](https://github.com/wojtek-t))

- Kubeadm: made the coredns deployment manifest use named ports consistently for the liveness and readiness probes. ([#131587](https://github.com/kubernetes/kubernetes/pull/131587), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]