ServerAddress: "serviceIP",
		},
	}
	internalIP := "10.0.0.1"
	publicIP := "1.1.1.1"
	testCases := []struct {
		Request     http.Request
		ExpectedMap []metav1.ServerAddressByClientCIDR
	}{
		{
			Request:     http.Request{},
			ExpectedMap: publicAddressCIDRMap,
		},
		{
			Request: http.Request{
				Header: map[string][]string{
					"X-Real-Ip": {internalIP},
				},
			},

			Addresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "1.2.3.4"},
			},
			Preferences: []v1.NodeAddressType{v1.NodeHostName},
			ExpectErr:   "no preferred addresses found; known addresses: [{InternalIP 1.2.3.4}]",
		},
		"found address": {
			Addresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "1.2.3.4"},
				{Type: v1.NodeExternalIP, Address: "1.2.3.5"},

    metadata:
      labels:
        k8s-app: metrics-server
    spec:
      containers:
      - args:
        - --cert-dir=/tmp
        - --secure-port=10250
        - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
        - --kubelet-use-node-status-port
        - --metric-resolution=15s
        - --kubelet-insecure-tls
        image: registry.k8s.io/metrics-server/metrics-server:v0.7.1

        command:
        - /metrics-server
        - --metric-resolution=15s
        - --kubelet-use-node-status-port
        - --kubelet-insecure-tls
        - --kubelet-preferred-address-types=InternalIP,Hostname,InternalDNS,ExternalDNS,ExternalIP
        - --cert-dir=/tmp
        - --secure-port=10250
        ports:
        - containerPort: 10250
          name: https
          protocol: TCP
        readinessProbe:

// * Warnings for references that could not be resolved. These are intended to be user facing.
func (gc GatewayContext) ResolveGatewayInstances(
	namespace string,
	gwsvcs []string,
	servers []*networking.Server,
) (internal, internalIP, external, pending, warns []string, allUsable bool) {
	ports := map[int]struct{}{}
	for _, s := range servers {
		ports[int(s.Port.Number)] = struct{}{}
	}
	foundInternal := sets.New[string]()