Given GEP-957 how to mark status of routes not matching neither port nor hostname of parentRef?

[shaneutt]

Discussed in #1512

^{Originally posted by pmalek November 7, 2022}
Given GEP-957 where one can define parentRef.port on a route, as well as already introduced hostname matching (that can be seen e.g. in HTTPRoute: https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1beta1.HTTPRouteSpec) how does one set the status of a route if none of the specified port nor hostname match the listener?

E.g. given the example below, what should be set in the route status?

---
apiVersion: gateway.networking.k8s.io/v1beta1
kind: Gateway
metadata:
  name: gateway1
spec:
  gatewayClassName: gatewayclass1
  listeners:
  - name: http
    protocol: HTTP
    port: 80
    hostname: hostname0.example
---
apiVersion: gateway.networking.k8s.io/v1beta1
kind: HTTPRoute
metadata:
  name: httpbin
  namespace: default
  annotations:
    konghq.com/strip-path: "true"
spec:
  parentRefs:
  - group: gateway.networking.k8s.io
    kind: Gateway
    name: gateway1
    port: 81
  hostnames:
  - hostname1.example
  rules:
  - backendRefs:
    - kind: Service
      name: httpbin
      port: 80
      weight: 1
    matches:
    - path:
        type: PathPrefix
        value: /httpbin

---

I've noticed there is already an open discussion on similar topic : #1445 but it doesn't touch this particular case.