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main.py

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+from fastapi import FastAPI
+from fastapi.responses import JSONResponse
+import time
+import psutil
+import os
+
+app = FastAPI()
+
+process = psutil.Process(os.getpid())
+last_cpu_times = process.cpu_times()
+last_time = time.time()
+
+def get_cpu_percent():
+
+    global last_cpu_times, last_time
+    now = time.time()
+    times = process.cpu_times()
+    elapsed = now - last_time
+    cpu_used = (times.user - last_cpu_times.user) + (times.system - last_cpu_times.system)
+    last_cpu_times = times
+    last_time = now
+
+    return round((cpu_used / elapsed) * 100, 1)
+
+def simulate_work():
+
+    start = time.time()
+    while (time.time() - start) < 0.005:
+        pass
+
+@app.get("/")
+async def root():
+    simulate_work()
+    return {"ok": True, "time": int(time.time() * 1000)}
+
+@app.get("/metrics")
+async def metrics():
+    try:
+        cpu_percent = get_cpu_percent()
+        mem_info = process.memory_info()
+        return {
+            "cpu": cpu_percent,
+            "memory": round(mem_info.rss / 1024 / 1024, 1)
+        }
+    except Exception as e:
+        return JSONResponse(status_code=500, content={"error": str(e)})
+
+if __name__ == "__main__":
+    port = int(os.environ.get("PORT", 3000))
+    print(f"✅ FastAPI server running on port {port}")
+    import uvicorn
+    uvicorn.run("main:app", host="0.0.0.0", port=port, log_level="info")

requirements.txt

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+fastapi
+uvicorn[standard]
+psutil