c.iamSTSAccountsMap[key] = u
	} else {
		c.iamUsersMap[key] = u
	}
	c.updatedAt = time.Now()
	return nil
}

// IAMStorageAPI defines an interface for the IAM persistence layer
type IAMStorageAPI interface {
	// The role of the read-write lock is to prevent go routines from
	// concurrently reading and writing the IAM storage. The (r)lock()

  - Easier to get a cluster up and running (eg: `kubeadm`, intra-cluster bootstrapping)
  - Easier to understand a cluster (eg: API audit logs, server-based API defaults)
- **Stateful Application Support**
  - Enhanced persistence capabilities (eg: `StorageClasses`, new volume plugins)
  - New resources and scheduler features (eg: `ScheduledJob` resource, pod/node affinity/anti-affinity)
- **Cluster Federation**

* Add option to expose federation apiserver on nodeport service ([#40516](https://github.com/kubernetes/kubernetes/pull/40516), [@shashidharatd](https://github.com/shashidharatd))
* Add option to disable persistence storage for etcd ([#40862](https://github.com/kubernetes/kubernetes/pull/40862), [@shashidharatd](https://github.com/shashidharatd))

	// In-memory and persisted multi-site replication state.
	state srState

	iamMetaCache srIAMCache
}

type srState srStateV1

// srStateV1 represents version 1 of the site replication state persistence
// format.
type srStateV1 struct {
	Name string `json:"name"`

	// Peers maps peers by their deploymentID
	Peers                   map[string]madmin.PeerInfo `json:"peers"`

- Fixed an issue where the `configmap`, `secret`, `projected`, and `downwardAPI` volume types didn't create user-visible files after a kubelet restart. This fix ensures data persistence and accessibility after restarts. ([#122807](https://github.com/kubernetes/kubernetes/pull/122807), [@carlory](https://github.com/carlory))

### SIG API Machinery

[SIG API Machinery][] is responsible for all aspects of the API server: API registration and discovery, generic API CRUD semantics, admission control, encoding/decoding, conversion, defaulting, persistence layer (etcd), OpenAPI, third-party resources, garbage collection, and client libraries.