add and test metric

modules/metrics.py

@@ -2,6 +2,12 @@
 import prometheus_client
 
 class Metrics(enum.Enum):
+
+    WAV_FILE_GENERATION_SECONDS = (
+        "wav_file_generation_seconds",
+        "Time taken to generate the phone script wav file in seconds",
+        prometheus_client.Summary,
+    )
 
     API_RESPONSE_CODES = (
         "leetcode_api_response_codes",
@@ -94,4 +100,4 @@ def instance(cls):
         if cls._instance is None:
             cls._instance = cls.__new__(cls)
             cls.init(cls)
-        return cls._instance
+        return cls._instance

server.py

@@ -147,6 +147,7 @@ async def get_phone_script():
     with wav_generation_lock:
         if last_wav_generation_time is None or current_time - last_wav_generation_time > 1800:
             logger.info("Regenerating phone script audio file on demand")
+            with metrics_handler.wav_file_generation_seconds.time():
             my_big_dumb_generation_life() 
 
     MetricsHandler.wav_last_sent.set(time.time())