layer1: add live namespace counts

pkg/utils/namespace_manager.go

@@ -123,6 +123,7 @@ func LogNamespaceManagerSummary(logger *zap.Logger, message string, summary Name
 	}
 	logger.Info(message,
 		zap.Int("total_namespaces", summary.TotalNamespaces),
+		zap.Int("live_namespaces", summary.LiveNamespaces),
 		zap.Any("phase_counts", summary.PhaseCounts),
 		zap.Any("source_counts", summary.SourceCounts),
 		zap.Strings("subscribers", summary.Subscribers),
@@ -258,6 +259,7 @@ func (m *inMemoryNamespaceManager) Summary() NamespaceManagerSummary {
 	records := m.SnapshotRecords()
 	summary := NamespaceManagerSummary{
 		TotalNamespaces: len(records),
+		LiveNamespaces:  len(m.Snapshot()),
 		PhaseCounts:     make(map[NamespacePhase]int),
 		SourceCounts:    make(map[NamespaceSource]int),
 		Subscribers:     m.SnapshotSubscribers(),

pkg/utils/namespace_manager_model.go

@@ -75,6 +75,7 @@ type NamespaceEvent struct {
 
 type NamespaceManagerSummary struct {
 	TotalNamespaces int
+	LiveNamespaces  int
 	PhaseCounts     map[NamespacePhase]int
 	SourceCounts    map[NamespaceSource]int
 	Subscribers     []string

pkg/utils/namespace_manager_test.go

@@ -63,6 +63,9 @@ func TestNamespaceManagerSnapshotAndGet(t *testing.T) {
 	if summary.TotalNamespaces != 2 {
 		t.Fatalf("expected summary total namespaces to be 2, got %d", summary.TotalNamespaces)
 	}
+	if summary.LiveNamespaces != 2 {
+		t.Fatalf("expected live namespaces to be 2, got %d", summary.LiveNamespaces)
+	}
 	if summary.SourceCounts[NamespaceSourceWatcher] != 2 {
 		t.Fatalf("expected watcher source count to be 2")
 	}
@@ -467,6 +470,9 @@ func TestNamespaceManagerSummary(t *testing.T) {
 	if summary.TotalNamespaces != 2 {
 		t.Fatalf("expected total namespaces 2, got %d", summary.TotalNamespaces)
 	}
+	if summary.LiveNamespaces != 1 {
+		t.Fatalf("expected one live namespace, got %d", summary.LiveNamespaces)
+	}
 	if summary.PhaseCounts[NamespacePhaseRegistering] != 1 {
 		t.Fatalf("expected one registering namespace")
 	}