layer1: add namespace summary active helper

pkg/utils/namespace_manager_model.go

@@ -81,6 +81,10 @@ type NamespaceManagerSummary struct {
 	Subscribers     []string
 }
 
+func (summary NamespaceManagerSummary) HasActiveNamespaces() bool {
+	return summary.LiveNamespaces > 0
+}
+
 type ManagedNamespaceWatcherConfig struct {
 	Component       string
 	Namespaces      []string

pkg/utils/namespace_manager_model_test.go

@@ -161,3 +161,14 @@ func TestNamespaceManagerSummaryZeroValue(t *testing.T) {
 		t.Fatalf("expected zero total namespaces")
 	}
 }
+
+func TestNamespaceManagerSummaryHasActiveNamespaces(t *testing.T) {
+	summary := NamespaceManagerSummary{LiveNamespaces: 1}
+	if !summary.HasActiveNamespaces() {
+		t.Fatalf("expected positive live count to report active namespaces")
+	}
+	summary.LiveNamespaces = 0
+	if summary.HasActiveNamespaces() {
+		t.Fatalf("expected zero live count to report no active namespaces")
+	}
+}