업데이트

src/metrics.py

@@ -0,0 +1,40 @@
+# src/metrics.py
+"""Lightweight metrics collection: counters and timers to JSON file."""
+
+import json
+import os
+import time
+
+from .common import LOG_DIR
+
+METRICS_FILE = os.path.join(LOG_DIR, "metrics.json")
+
+
+class Metrics:
+    def __init__(self) -> None:
+        self._counters: dict[str, int] = {}
+        self._timers: dict[str, float] = {}
+
+    def inc(self, key: str, n: int = 1) -> None:
+        self._counters[key] = self._counters.get(key, 0) + n
+
+    def observe(self, key: str, value: float) -> None:
+        # Store last observed value
+        self._timers[key] = float(value)
+
+    def dump(self) -> None:
+        os.makedirs(LOG_DIR, exist_ok=True)
+        payload = {
+            "ts": time.time(),
+            "counters": self._counters,
+            "timers": self._timers,
+        }
+        try:
+            with open(METRICS_FILE, "w", encoding="utf-8") as f:
+                json.dump(payload, f, ensure_ascii=False, indent=2)
+        except Exception:
+            # Metrics should never crash app
+            pass
+
+
+metrics = Metrics()