an implementation MAY infer the backend protocol through
                          its own means. Implementations MAY infer the protocol from
                          the Route type referring to the backend Service. \n If a
                          Route is not able to send traffic to the backend using the
                          specified protocol then the backend is considered invalid.

### Backend. Native. Debug

- [`KT-65553`](https://youtrack.jetbrains.com/issue/KT-65553) K2: Native: kt42208WithPassingLambdaToAnotherFunction test fails with K2
- [`KT-57365`](https://youtrack.jetbrains.com/issue/KT-57365) [Native] Incorrect debug info on inline function call site

### Backend. Wasm

#### New Features

			if postIndex < 0 {
				return ErrInvalidLengthGenerated
			}
			if postIndex > l {
				return io.ErrUnexpectedEOF
			}
			if m.Backend == nil {
				m.Backend = &IngressBackend{}
			}
			if err := m.Backend.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
				return err
			}
			iNdEx = postIndex
		case 2:
			if wireType != 2 {

* A buffered audit backend can be used with other audit backends. ([#60076](https://github.com/kubernetes/kubernetes/pull/60076), [@crassirostris](https://github.com/crassirostris))

        "properties": {
          "backend": {
            "allOf": [
              {
                "$ref": "#/components/schemas/io.k8s.api.networking.v1.IngressBackend"
              }
            ],
            "default": {},

Before upgrading to Kubernetes 1.13, you must keep the following in mind:

- kube-apiserver

kind: ConfigMap
apiVersion: v1
metadata:
  name: calico-config
  namespace: kube-system
data:
  # Typha is disabled.
  typha_service_name: "none"
  # Configure the backend to use.
  calico_backend: "bird"

  # Configure the MTU to use for workload interfaces and tunnels.
  # By default, MTU is auto-detected, and explicitly setting this field should not be required.

	}
}

func InitConfig() {
	types_ := ssa.NewTypes()

	if Arch.SoftFloat {
		softfloatInit()
	}

	// Generate a few pointer types that are uncommon in the frontend but common in the backend.
	// Caching is disabled in the backend, so generating these here avoids allocations.
	_ = types.NewPtr(types.Types[types.TINTER])                             // *interface{}

- Print `<default>` as the value in case kubectl describe ingress shows `default-backend:80` when no default backend is present ([#108506](https://github.com/kubernetes/kubernetes/pull/108506), [@jlsong01](https://github.com/jlsong01))

* GCE: Fix for internal load balancer management resulting in backend services with outdated instance group links. ([#62887](https://github.com/kubernetes/kubernetes/pull/62887), [@nicksardo](https://github.com/nicksardo))