Claude Code: Add /metrics endpoint with psutil for CPU, memory, disk usage

app.py

@@ -69,6 +69,44 @@ def get_app():
             "active_agents": 1  # Cain is always active
         }
 
+    @app.get("/metrics")
+    async def metrics():
+        """System metrics endpoint with CPU, memory, and disk usage."""
+        try:
+            import psutil
+        except ImportError:
+            return JSONResponse(
+                status_code=503,
+                content={"error": "psutil not installed", "message": "System metrics unavailable"}
+            )
+
+        try:
+            cpu_percent = psutil.cpu_percent(interval=0.1)
+            memory = psutil.virtual_memory()
+            disk = psutil.disk_usage('/')
+
+            return {
+                "cpu_percent": cpu_percent,
+                "memory": {
+                    "percent": memory.percent,
+                    "total_gb": round(memory.total / (1024**3), 2),
+                    "used_gb": round(memory.used / (1024**3), 2),
+                    "available_gb": round(memory.available / (1024**3), 2)
+                },
+                "disk": {
+                    "percent": disk.percent,
+                    "total_gb": round(disk.total / (1024**3), 2),
+                    "used_gb": round(disk.used / (1024**3), 2),
+                    "free_gb": round(disk.free / (1024**3), 2)
+                }
+            }
+        except Exception as e:
+            logger.error(f"Error collecting metrics: {e}")
+            return JSONResponse(
+                status_code=500,
+                content={"error": "Failed to collect metrics", "message": str(e)}
+            )
+
     @app.exception_handler(Exception)
     async def global_exception_handler(request: Request, exc: Exception):
         """Global exception handler to catch all errors."""