Change:
updated the automatic reloading logic from file watch to polling. This change in behavior needs to be documented [ ] Update the v1.29 release notes to call out this change in behavior (ref: ) to replace references to file watch with polling. /sig auth /triage accepted /assign nilekhc

Discussion:
- `alpha` support (guarded by the `ServiceAccountTokenJTI` feature gate) for adding a `jti` (JWT ID) claim to service account tokens it issues, adding an `authentication.kubernetes.io/credential-id` audit annotation in audit logs when the tokens are issued, and `authentication.kubernetes.io/credential-id` entry in the extra user info when the token is used to authenticate. - `alpha` support (guarded by the `ServiceAccountTokenPodNodeInfo` feature gate) for including the node name (and uid, if the node exists) as additional claims in service account tokens it issues which are bound to pods, and `authentication.kubernetes.io/node-name` and `authentication.kubernetes.io/node-uid` extra user info when the token is used to authenticate. - `alpha` support (guarded by the `ServiceAccountTokenNodeBinding` feature gate) for allowing `TokenRequests` that bind tokens directly to nodes, and (guarded by the ServiceAccountTokenNodeBindingValidation feature gate) for validating the node name and uid still exist when the token is used. ([#120780](https://github.com/kubernetes/kubernetes/pull/120780), [@munnerz](https://github.com/munnerz)) <ins> - `kube-apiserver` updated: - Updated encryption configuration file watch logic from using inotify watch to polling at an interval of every minute. Moved the logic to polling because there are variations on file changes (like symlink swapping of directories that contain the encryption config) that the file watch logic would fail to detect. Polling at a set interval prevents any such issues. Note that there is no guarantee on how quickly the API server will process the encryption config. The `apiserver_encryption_config_controller_automatic_reload_last_timestamp_seconds` metric must be used to determine when the new config becomes effective.([#121310](https://github.com/kubernetes/kubernetes/pull/121310), [@nilekhc](https://github.com/nilekhc)) </ins> - `kube-controller-manager`: The `LegacyServiceAccountTokenCleanUp` feature gate is now `beta` and enabled by default. When enabled, legacy auto-generated service account token secrets are auto-labeled with a `kubernetes.io/legacy-token-invalid-since` label if the credentials have not been used in the time specified by `--legacy-service-account-token-clean-up-period` (defaulting to one year), **and** are referenced from the `.secrets` list of a ServiceAccount object, **and**  are not referenced from pods. This label causes the authentication layer to reject use of the credentials. After being labeled as invalid, if the time specified by `--legacy-service-account-token-clean-up-period` (defaulting to one year) passes without the credential being used, the secret is automatically deleted. Secrets labeled as invalid which have not been auto-deleted yet can be re-activated by removing the `kubernetes.io/legacy-token-invalid-since` label. ([#120682](https://github.com/kubernetes/kubernetes/pull/120682), [@yt2985](https://github.com/yt2985)) - `kube-proxy` will only install the `DROP` rules for invalid `conntrack` states if the `nf_conntrack_tcp_be_liberal` is not set. ([#120412](https://github.com/kubernetes/kubernetes/pull/120412), [@aojea](https://github.com/aojea))