/** Shared ObjectMapper instance for JSON processing. */
    protected static final ObjectMapper objectMapper = new ObjectMapper();

    /** Buffer size reserved when truncating context to fit within max chars limit. */
    protected static final int CONTEXT_TRUNCATION_BUFFER = 100;

    /** The HTTP client used for API communication. */

### Other (Cleanup or Flake)

- Service session affinity timeout tests are no longer required for Kubernetes network plugin conformance due to variations in existing implementations. New conformance tests will be developed to better express conformance in future releases. ([#112806](https://github.com/kubernetes/kubernetes/pull/112806), [@dcbw](https://github.com/dcbw)) [SIG Architecture, Network and Testing]

## Dependencies

### Added

### 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]

### API Change

#### New API types/versions:
- A new IngressClass resource has been added to enable better Ingress configuration. ([#88509](https://github.com/kubernetes/kubernetes/pull/88509), [@robscott](https://github.com/robscott)) [SIG API Machinery, Apps, CLI, Network, Node and Testing]

  Users should update import path for these types from `k8s.io/kubernetes/pkg/scheduler/framework` to `k8s.io/kube-scheduler/framework` and update use of fields (to use getter/setter functions instead) where needed. ([#132457](https://github.com/kubernetes/kubernetes/pull/132457), [@ania-borowiec](https://github.com/ania-borowiec)) [SIG Node, Scheduling, Storage and Testing]

"chainable","emptyGet","raw","bulk","_key","rmsPrefix","rdashAlpha","fcamelCase","_all","letter","toUpperCase","camelCase","string","acceptData","owner","Data","uid","defineProperty","configurable","set","data","prop","hasData","dataPriv","dataUser","rbrace","rmultiDash","dataAttr","JSON","parse","removeData","_data","_removeData","attrs","dequeue","startLength","hooks","_queueHooks","unshift","stop","setter","clearQueue","tmp","count","defer","pnum","source","rcssNum","cssExpand","isAttached","...

  So, if you want to just keep the existing behavior, you can register `ClusterEventWithHint` with no `QueueingHintFn` in it. 
  But, registering appropriate `QueueingHintFn` is, of course, better from a scheduling performance perspective. ([#118551](https://github.com/kubernetes/kubernetes/pull/118551), [@sanposhiho](https://github.com/sanposhiho)) [SIG Node, Scheduling, Storage and Testing]

  you want to set the equivalent of any of the `--iptables-xxx` options.)
  
  As this code is still very new, it has not been heavily optimized yet;
  while it is expected to _eventually_ have better performance than the
  iptables backend, very little performance testing has been done so far. ([#121046](https://github.com/kubernetes/kubernetes/pull/121046), [@danwinship](https://github.com/danwinship))

### Other (Cleanup or Flake)
 - base-images: Use debian-base:v2.1.0 (update to Debian Buster, includes CVE fixes)

* fix network setup in hack/local-up-cluster.sh (https://github.com/kubernetes/kubernetes/pull/60431) ([#60633](https://github.com/kubernetes/kubernetes/pull/60633), [@pohly](https://github.com/pohly))
    * better error diagnostics in hack/local-up-cluster.sh output
* Add prometheus cluster monitoring addon to kube-up ([#62195](https://github.com/kubernetes/kubernetes/pull/62195), [@serathius](https://github.com/serathius))