- kubeadm: JoinConfiguration now houses the discovery options in a nested Discovery structure, which in turn has a couple of other nested structures to house more specific options (BootstrapTokenDiscovery and FileDiscovery) ([#67763](https://github.com/kubernetes/kubernetes/pull/67763), [@rosti](https://github.com/rosti))

## Dependencies

### Added
- github.com/antihax/optional: [v1.0.0](https://github.com/antihax/optional/tree/v1.0.0)
- github.com/benbjohnson/clock: [v1.0.3](https://github.com/benbjohnson/clock/tree/v1.0.3)
- github.com/bits-and-blooms/bitset: [v1.2.0](https://github.com/bits-and-blooms/bitset/tree/v1.2.0)

- Added a new option `strict-cpu-reservation` for CPU Manager static policy. When this option is enabled, CPU cores in `reservedSystemCPUs` will be strictly used for system daemons and interrupt processing no longer available for any workload. ([#130290](https://github.com/kubernetes/kubernetes/pull/130290),...

- Pod eviction now honors graceful deletion by default if no delete options are provided in the eviction request. ([#72730](https://github.com/kubernetes/kubernetes/pull/72730), [@liggitt](https://github.com/liggitt))

### Auth

rate limit is switched to per-client. A set of new rate limit configure options are introduced, including routeRateLimit, SubnetsRateLimit, InterfaceRateLimit, RouteTableRateLimit, LoadBalancerRateLimit, PublicIPAddressRateLimit, SecurityGroupRateLimit, VirtualMachineRateLimit, StorageAccountRateLimit, DiskRateLimit, SnapshotRateLimit, VirtualMachineScaleSetRateLimit and VirtualMachineSizeRateLimit. The original rate limit options would be default values for those new client's rate limiter. ([#8651...

Factor      = production_name | token [ "…" token ] | Group | Option | Repetition .
Group       = "(" Expression ")" .
Option      = "[" Expression "]" .
Repetition  = "{" Expression "}" .
</pre>

<p>
Productions are expressions constructed from terms and the following
operators, in increasing precedence:
</p>
<pre class="grammar">
|   alternation
()  grouping
[]  option (0 or 1 times)
{}  repetition (0 to n times)
</pre>

- The name of CEL(Common Expression Language) optional type has been changed from `optional` to `optional_type`. ([#124328](https://github.com/kubernetes/kubernetes/pull/124328), [@jiahuif](https://github.com/jiahuif)) [SIG API Machinery, Architecture, Auth, CLI, Cloud Provider, Network and Node]

- Added new optional APIs in `ResouceSlice.Basic` and `ResourceClaim.Status.AllocatedDeviceStatus`. ([#130160](https://github.com/kubernetes/kubernetes/pull/130160), [@KobayashiD27](https://github.com/KobayashiD27)) [SIG API Machinery, Apps, Architecture, Node, Release,...

* Add override flags options to kubefed init ([#40917](https://github.com/kubernetes/kubernetes/pull/40917), [@irfanurrehman](https://github.com/irfanurrehman))
* Add option to expose federation apiserver on nodeport service ([#40516](https://github.com/kubernetes/kubernetes/pull/40516), [@shashidharatd](https://github.com/shashidharatd))

* kubeadm now has a join timeout that can be controlled via the `discoveryTimeout` config option. This option is set to 5 minutes by default. ([#60983](https://github.com/kubernetes/kubernetes/pull/60983), [@rosti](https://github.com/rosti))