- The `IngressClass.Spec.Parameters.Namespace` field is now GA. ([#104636](https://github.com/kubernetes/kubernetes/pull/104636), [@hbagdi](https://github.com/hbagdi))

can now store only `null` when created using the protobuf content-type or stored in etcd using protobuf serialization (the default in 1.6).
JSON API clients should tolerate `null` values for such fields, and treat `null` and `[]` as equivalent in meaning unless specifically documented otherwise for a particular field. ([#44593](https://github.com/kubernetes/kubernetes/pull/44593))

    * Logging Agent Improvements
    * Bump logging agent version to 0.2-1.5.33-1-k8s-1.
    * Appropriately set log severity for k8s_container.
    * Fix detect exceptions plugin to analyze message field instead of log field.
    * Fix detect exceptions plugin to analyze streams based on local resource id.
    * Disable the metadata agent for monitored resource construction in logging.

* client-go: restores behavior of populating the BearerToken field in rest.Config objects constructed from kubeconfig files containing tokenFile config, or from in-cluster configuration. An additional BearerTokenFile field is now populated to enable constructed clients to periodically refresh tokens. ([#71713](https://github.com/kubernetes/kubernetes/pull/71713), [@liggitt](https://github.com/liggitt))...

- '`PodDisruptionBudget` now adds an alpha `spec.unhealthyPodEvictionPolicy` field.
  When the `PDBUnhealthyPodEvictionPolicy` feature-gate is enabled in `kube-apiserver`,
  setting this field to `"AlwaysAllow"` allows pods to be evicted if they do not
  have a ready condition, regardless of whether the PodDisruptionBudget is currently
  healthy.'

- EndpointSlice has a new NodeName field guarded by the EndpointSliceNodeName feature gate.
  - EndpointSlice topology field will be deprecated in an upcoming release.
  - EndpointSlice "IP" address type is formally removed after being deprecated in Kubernetes 1.17.

### Extending Ingress with and replacing a deprecated annotation with IngressClass

In Kubernetes 1.18, there are two significant additions to Ingress: A new `pathType` field and a new `IngressClass` resource. The `pathType` field allows specifying how paths should be matched. In addition to the default `ImplementationSpecific` type, there are new `Exact` and `Prefix` path types. 

- Kubeadm: use the `--service-cluster-ip-range` flag to init or use the ServiceSubnet field in the kubeadm config to pass a comma separated list of Service CIDRs. ([#82473](https://github.com/kubernetes/kubernetes/pull/82473),...

Using resources from dependencies with `yield` in background tasks is no longer supported.

This change is what supports the new features, read below. 🤓

### Dependencies with `yield`, `HTTPException` and Background Tasks

Dependencies with `yield` now can raise `HTTPException` and other exceptions after `yield`. 🎉

pkg syscall (netbsd-arm64-cgo), const SYS__SCHED_SETPARAM = 346
pkg syscall (netbsd-arm64-cgo), const SYS__SCHED_SETPARAM ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_SCHED_YIELD = 350
pkg syscall (netbsd-arm64-cgo), const SYS_SCHED_YIELD ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_SELECT = 417
pkg syscall (netbsd-arm64-cgo), const SYS_SELECT ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_SEMCONFIG = 223