feat: add logging for node isolation debugging in node-guardian

scripts/node-guardian-loop.py

@@ -146,6 +146,10 @@ class NodeGuardian:
         try:
             payload = {"metrics": metrics or {}}
             
+            # Log key info for debugging node isolation
+            swapper_url = os.getenv("SWAPPER_URL", "http://swapper-service:8890")
+            logger.info(f"📤 Sending heartbeat: node_id={self.node_id}, swapper_url={swapper_url}")
+            
             response = await self.client.post(
                 f"{self.city_url}/city/internal/node/{self.node_id}/heartbeat",
                 json=payload
@@ -223,10 +227,9 @@ class NodeGuardian:
                     # Swapper uses "status": "loaded" not "loaded": true
                     metrics["swapper_models_loaded"] = sum(1 for m in models if m.get("status") == "loaded")
                     metrics["swapper_state"] = data
+                    logger.debug(f"🧠 Swapper metrics: healthy={metrics['swapper_healthy']}, loaded={metrics['swapper_models_loaded']}/{metrics['swapper_models_total']}")
             except Exception as e:
-                # logger.warning(f"Failed to fetch Swapper models: {e}")
-                # Swapper might not be ready or not deployed on this node
-                pass
+                logger.warning(f"Failed to fetch Swapper models from {swapper_url}: {e}")
                 
         except Exception as e:
             logger.warning(f"Swapper metrics collection failed: {e}")