layer1: log watcher namespace transitions

pkg/utils/namespace_manager_test.go

@@ -378,6 +378,35 @@ func TestHandleWatcherNamespaceAddUpdateDelete(t *testing.T) {
 	}
 }
 
+func TestHandleWatcherNamespaceAddLogsSummary(t *testing.T) {
+	manager := NewNamespaceManager()
+	router := &testNamespaceSubscriber{name: "router"}
+	manager.Subscribe(router)
+	core, logs := observer.New(zap.InfoLevel)
+	logger := zap.New(core)
+	namespace := &corev1.Namespace{}
+	namespace.Name = "tenant-a"
+	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}
+
+	HandleWatcherNamespaceAdd(context.Background(), logger, "router.NSWatcher", manager, namespace)
+
+	entries := logs.AllUntimed()
+	if len(entries) != 1 {
+		t.Fatalf("expected one summary log entry, got %d", len(entries))
+	}
+	if entries[0].Message != "router.NSWatcher: namespace manager summary" {
+		t.Fatalf("unexpected log message: %s", entries[0].Message)
+	}
+	fields := entries[0].ContextMap()
+	active, ok := fields["has_active_namespaces"].(bool)
+	if !ok || !active {
+		t.Fatalf("expected summary log to report active namespaces")
+	}
+	if live, ok := fields["live_namespaces"].(int64); !ok || live != 1 {
+		t.Fatalf("expected summary log to report one live namespace, got %v", fields["live_namespaces"])
+	}
+}
+
 func TestHandleWatcherNamespaceRemovalDispatch(t *testing.T) {
 	manager := NewNamespaceManager()
 	router := &testNamespaceSubscriber{name: "router"}