- Migrate log messages in pkg/scheduler/{scheduler.go,factory.go} to structured logging ([#97509](https://github.com/kubernetes/kubernetes/pull/97509), [@aldudko](https://github.com/aldudko)) [SIG Scheduling]

    * authenticates the kubelet to the API server.
* change AddEventHandlerWithResyncPeriod to AddEventHandler in factory.go ([#51582](https://github.com/kubernetes/kubernetes/pull/51582), [@jiulongzaitian](https://github.com/jiulongzaitian))

`wait.NewExponentialBackoffManager` and `wait.NewJitteringBackoffManager` functions have been marked as deprecated.  Callers should switch to using the `Backoff{...}.DelayWithReset(clock, resetInterval)` method and must set the `Steps` field when using `Factor`. As a short term change, callers may use the `Timer()` method on the `BackoffManager` until the backoff managers are deprecated and removed. Please see the godoc of the deprecated functions for examples of how to replace usage of this function. ...

    * Please convert your `v1alpha2` configuration files to `v1alpha3` using the
    * `kubeadm config migrate` command of kubeadm v1.12.x

### Other notable changes

* Refactor factory_test.go to use a fake k8s client. ([#69412](https://github.com/kubernetes/kubernetes/pull/69412), [@tossmilestone](https://github.com/tossmilestone))

* bootstrap: Start hostNetwork pods even if network plugin not ready ([#33347](https://github.com/kubernetes/kubernetes/pull/33347), [@justinsb](https://github.com/justinsb))
* Factor out post-init swagger and OpenAPI routes ([#32590](https://github.com/kubernetes/kubernetes/pull/32590), [@sttts](https://github.com/sttts))

### Bug or Regression

- Added jitter factor to lease controller that better smears load on kube-apiserver over time. ([#101652](https://github.com/kubernetes/kubernetes/pull/101652), [@marseel](https://github.com/marseel)) [SIG API Machinery and Scalability]

### Bug or Regression

- Added jitter factor to lease controller that better smears load on kube-apiserver over time. ([#101652](https://github.com/kubernetes/kubernetes/pull/101652), [@marseel](https://github.com/marseel)) [SIG API Machinery and Scalability]

* Administrator is able to configure max pids for a pod on a node. ([#72076](https://github.com/kubernetes/kubernetes/pull/72076), [@derekwaynecarr](https://github.com/derekwaynecarr))
* Move users of `factory.NewConfigFactory` to `scheduler.New`. ([#71875](https://github.com/kubernetes/kubernetes/pull/71875), [@wgliang](https://github.com/wgliang))