- Introduce a churn operator to scheduler perf testing framework. ([#98900](https://github.com/kubernetes/kubernetes/pull/98900), [@Huang-Wei](https://github.com/Huang-Wei)) [SIG Scheduling and Testing]

### OpenStack

on average) and rapid updates to pod configuration should take effect sooner.
  
  A new metric `kubelet_known_pods` has been added at ALPHA stability to report the number of pods a Kubelet is tracking in a number of internal states.  Operators may use the metrics to track an excess of pods in the orphaned state that may not be completing. ([#113145](https://github.com/kubernetes/kubernetes/pull/113145), [@smarterclayton](https://github.com/smarterclayton)) [SIG API Machinery, Auth, Cloud...

* Switch JSON marshal/unmarshal to json-iterator library.  Performance should be close to previous with no generated code. ([#48287](https://github.com/kubernetes/kubernetes/pull/48287), [@thockin](https://github.com/thockin))

- We no longer allow the cluster operator to delete any suggested priority & fairness bootstrap configuration object. If a cluster operator removes a suggested configuration, it will be restored by the apiserver. ([#102067](https://github.com/kubernetes/kubernetes/pull/102067), [@tkashem](https://github.com/tkashem))

- github.com/ianlancetaylor/demangle: [5e5cf60 → 28f6c0f](https://github.com/ianlancetaylor/demangle/compare/5e5cf60...28f6c0f)
- github.com/json-iterator/go: [v1.1.11 → v1.1.12](https://github.com/json-iterator/go/compare/v1.1.11...v1.1.12)
- github.com/magiconair/properties: [v1.8.1 → v1.8.5](https://github.com/magiconair/properties/compare/v1.8.1...v1.8.5)

- github.com/gorilla/mux: [v1.7.0 → v1.7.3](https://github.com/gorilla/mux/compare/v1.7.0...v1.7.3)
- github.com/json-iterator/go: [v1.1.8 → v1.1.10](https://github.com/json-iterator/go/compare/v1.1.8...v1.1.10)
- github.com/jstemmer/go-junit-report: [af01ea7 → v0.9.1](https://github.com/jstemmer/go-junit-report/compare/af01ea7...v0.9.1)

- github.com/google/cadvisor: [8450c56 → v0.37.0](https://github.com/google/cadvisor/compare/8450c56...v0.37.0)
- github.com/json-iterator/go: [v1.1.9 → v1.1.10](https://github.com/json-iterator/go/compare/v1.1.9...v1.1.10)
- github.com/opencontainers/go-digest: [v1.0.0-rc1 → v1.0.0](https://github.com/opencontainers/go-digest/compare/v1.0.0-rc1...v1.0.0)

- 'Priority and Fairness has introduced a new feature called _borrowing_ that allows an API priority level
  to borrow a number of seats from other priority level(s). As a cluster operator, you can enable borrowing
  for a certain priority level configuration object via the two newly introduced fields `lendablePercent`, and