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(),