Fix hint annotation implementation in AntreaProxy (antrea-io#6607)

This commit is to be consistent with kube-proxy's behavior for Topology
Aware Routing feature.

For `service.kubernetes.io/topology-mode` hint annotation, any non-empty
and non-disabled values for the annotation are acceptable to enable
Topology Aware Routing for a Service.

Signed-off-by: Hongliang Liu <[email protected]>

Author: hongliangl

pkg/agent/proxy/topology.go

@@ -124,11 +124,9 @@ func (p *proxier) canUseTopology(endpoints map[string]k8sproxy.Endpoint, svcInfo
 	if !p.topologyAwareHintsEnabled {
 		return false
 	}
+	// Any non-empty and non-disabled values for the hints annotation are acceptable.
 	hintsAnnotation := svcInfo.HintsAnnotation()
-	if hintsAnnotation != "Auto" && hintsAnnotation != "auto" {
-		if hintsAnnotation != "" && hintsAnnotation != "Disabled" && hintsAnnotation != "disabled" {
-			klog.InfoS("Skipping topology aware Endpoint filtering since Service has unexpected value", "annotationTopologyAwareHints", v1.DeprecatedAnnotationTopologyAwareHints, "hints", hintsAnnotation)
-		}
+	if hintsAnnotation == "" || hintsAnnotation == "disabled" || hintsAnnotation == "Disabled" {
 		return false
 	}
 

pkg/agent/proxy/topology_test.go

@@ -97,7 +97,7 @@ func TestCategorizeEndpoints(t *testing.T) {
 			localEndpoints:   nil,
 		},
 		{
-			name:         "hints enabled, hints annotation == aUto (wrong capitalization), hints ignored",
+			name:         "hints enabled, hints annotation == aUto (wrong capitalization), hints no longer ignored",
 			hintsEnabled: true,
 			nodeLabels:   map[string]string{v1.LabelTopologyZone: "zone-a"},
 			serviceInfo:  k8sproxy.NewBaseServiceInfo(net.ParseIP("10.96.0.1"), 80, v1.ProtocolTCP, 0, nil, "", 0, nil, nil, 0, false, false, nil, "aUto"),
@@ -107,7 +107,7 @@ func TestCategorizeEndpoints(t *testing.T) {
 				"10.1.2.5:80": &k8sproxy.BaseEndpointInfo{Endpoint: "10.1.2.5:80", ZoneHints: sets.New[string]("zone-c"), Ready: true},
 				"10.1.2.6:80": &k8sproxy.BaseEndpointInfo{Endpoint: "10.1.2.6:80", ZoneHints: sets.New[string]("zone-a"), Ready: true},
 			},
-			clusterEndpoints: sets.New[string]("10.1.2.3:80", "10.1.2.4:80", "10.1.2.5:80", "10.1.2.6:80"),
+			clusterEndpoints: sets.New[string]("10.1.2.3:80", "10.1.2.6:80"),
 			localEndpoints:   nil,
 		},
 		{