Routes per shard metric inaccurate if using matchExpression

If using ingresscontroller.spec.routeSelector.matchExpressions or ingresscontroller.spec.namespaceSelector.matchExpressions, the route will not count in the new route_metrics_controller_routes_per_shard prometheus metric.

This is due to the logic only using "matchLabels". The logic needs to be updated to also use "matchExpressions".

4.12

100%

1. Create IC with matchExpressions:
oc apply -f - <<EOF
apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: sharded
  namespace: openshift-ingress-operator
spec:
  domain: reproducer.$domain
  routeSelector:
    matchExpressions:
    - key: type
      operator: In
      values:
      - shard
  replicas: 1
  nodePlacement:
    nodeSelector:
      matchLabels:
        node-role.kubernetes.io/worker: ""
EOF

2. Create the route:
oc apply -f - <<EOF
apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: route-shard
  labels:
    type: shard
spec:
  to:
    kind: Service
    name: router-shard
EOF

 3. Check route_metrics_controller_routes_per_shard{name="sharded"} in prometheus, it's 0 

route_metrics_controller_routes_per_shard{name="sharded"} has 0 routes

route_metrics_controller_routes_per_shard{name="sharded"} should have 1 route