### 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. 

- Dropped support for networking/v1beta1 Ingress in kubectl ([#135176](https://github.com/kubernetes/kubernetes/pull/135176), [@scaliby](https://github.com/scaliby)) [SIG CLI]
- Dropped support for networking/v1beta1 IngressClass in kubectl ([#135108](https://github.com/kubernetes/kubernetes/pull/135108), [@scaliby](https://github.com/scaliby)) [SIG CLI]

APIs. This removal includes beta versions of `ValidatingWebhookConfiguration`, `MutatingWebhookConfiguration`, `CustomResourceDefinition`, `APIService`, `TokenReview`, `SubjectAccessReview`, `CertificateSigningRequest`, `Lease`, `Ingress`, and `IngressClass` APIs. For the full list check out [Deprecated API Migration Guide](https://kubernetes.io/docs/reference/using-api/deprecation-guide/#v1-22) and the blog post [Kubernetes API and Feature Removals In 1.22: Here’s What You Need To Know](https://...

- Implement the GetAvailableResources in the podresources API. ([#95734](https://github.com/kubernetes/kubernetes/pull/95734), [@fromanirh](https://github.com/fromanirh)) [SIG Instrumentation, Node and Testing]
- IngressClass resource can now reference a resource in a specific namespace 
  for implementation-specific configuration (previously only Cluster-level resources were allowed). 

- If a user attempts to add an ephemeral container to a static pod, they will now get a visible validation error. ([#114086](https://github.com/kubernetes/kubernetes/pull/114086), [@xmcqueen](https://github.com/xmcqueen))
- Ingress with `ingressClass` annotation and `IngressClassName` both set can be created now. ([#115447](https://github.com/kubernetes/kubernetes/pull/115447), [@AxeZhan](https://github.com/AxeZhan))

- Improved `kubectl run` and `kubectl debug` error messages upon attaching failures. ([#110764](https://github.com/kubernetes/kubernetes/pull/110764), [@soltysh](https://github.com/soltysh))

  iptables-nft. ([#109059](https://github.com/kubernetes/kubernetes/pull/109059), [@danwinship](https://github.com/danwinship))
- The output of `kubectl describe ingress` now includes an IngressClass name if available. ([#107921](https://github.com/kubernetes/kubernetes/pull/107921), [@mpuckett159](https://github.com/mpuckett159))

- The `CSIVolumeFSGroupPolicy` feature has moved from beta to GA. ([#105940](https://github.com/kubernetes/kubernetes/pull/105940), [@dobsonj](https://github.com/dobsonj))
- The `IngressClass.Spec.Parameters.Namespace` field is now GA. ([#104636](https://github.com/kubernetes/kubernetes/pull/104636), [@hbagdi](https://github.com/hbagdi))