diff --git a/ai-hub/app/core/grpc/services/grpc_server.py b/ai-hub/app/core/grpc/services/grpc_server.py
index 8e079e8..532e259 100644
--- a/ai-hub/app/core/grpc/services/grpc_server.py
+++ b/ai-hub/app/core/grpc/services/grpc_server.py
@@ -562,6 +562,8 @@
     def ReportHealth(self, request_iterator, context):
         """Collect Health Metrics and Feed Policy Updates."""
         for hb in request_iterator:
+            if hb.node_id == "synology-nas" or os.getenv("DEBUG_GRPC"):
+                logger.info(f"[💓] ReportHealth from {hb.node_id}: CPU {hb.cpu_usage_percent}%")
             self.registry.update_stats(hb.node_id, {
                 "active_worker_count": hb.active_worker_count, 
                 "cpu_usage_percent": hb.cpu_usage_percent,
diff --git a/ai-hub/app/core/services/node_registry.py b/ai-hub/app/core/services/node_registry.py
index 4054a9a..adc9481 100644
--- a/ai-hub/app/core/services/node_registry.py
+++ b/ai-hub/app/core/services/node_registry.py
@@ -439,6 +439,8 @@
                 node.update_stats(stats)
                 if stats.get("cpu_usage_percent", 0) > 0 or stats.get("memory_usage_percent", 0) > 0:
                     logger.debug(f"[💓] Heartbeat {node_id}: CPU {stats.get('cpu_usage_percent')}% | MEM {stats.get('memory_usage_percent')}%")
+            else:
+                logger.warning(f"[💓⚠️] Heartbeat received for UNKNOWN node: {node_id}. Live nodes: {list(self._nodes.keys())}")
         # Persist heartbeat timestamp to DB asynchronously
         self.db_executor.submit(self._db_update_heartbeat, node_id)
         # Emit heartbeat event to live UI