When a gateway is created with multiple listeners, corresponding multiple DNSRecords are also created. When a listener is removed from the gateway the corresponding DNSRecord is not deleted  

    OCP 4.19

    Always

    1. Create a gateway with 3 unique listeners with different hostNames
e.g
oc create -f - <<EOF
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: gateway
  namespace: openshift-ingress
spec:
  gatewayClassName: openshift-default
  listeners:
  - name: http
    hostname: "*.$gwapi_domain"
    port: 80
    protocol: HTTP
    allowedRoutes:
      namespaces:
        from: All
  - name: https
    hostname: "*.prod.example.com"
    port: 443
    protocol: HTTPS
    tls:
      mode: Terminate
      certificateRefs:
      - name: gwapi-wildcard
    allowedRoutes:
      namespaces:
        from: All
  - name: prod-https
    hostname: "*.stage.example.com"
    port: 443
    protocol: HTTPS
    tls:
      mode: Terminate
      certificateRefs:
      - name: gwapi-wildcard
    allowedRoutes:
      namespaces:
        from: All
EOF     
    2. Check the DNSRecords in the openshift-ingress namespace
    3. Edit the gateway CR and remove a listener
    4. Check the DNSRecords again after removing the listener
    

DNSRecord of the removed listener still remains    

    DNSRecord of the removed listener should be deleted