REFACTOR API gateway

services/tenant/app/main.py

@@ -89,7 +89,7 @@ async def health_check():
 @app.get("/metrics")
 async def metrics():
     """Prometheus metrics endpoint"""
-    return metrics_collector.generate_latest()
+    return metrics_collector.get_metrics()
 
 if __name__ == "__main__":
     import uvicorn