cleanup all worker stats when starting up servers

server/metrics/ServerMetricsCollector.py

@@ -1,9 +1,9 @@
-import time
-
 from server.metrics.MetricsManager import MetricsManager
 
+import time
+
 class ServerMetricsCollector:
-  def __init__(self, metrics_manager:MetricsManager, game_state_local_cache:bool, metrics_backend:str, game_state_backend:str, stale_game_timeout_sec:int, game_last_seen_unix:dict, game_move_counts:dict,):
+  def __init__(self, metrics_manager:MetricsManager, game_state_local_cache:bool, metrics_backend:str, game_state_backend:str, stale_game_timeout_sec:int, game_last_seen_unix:dict, game_move_counts:dict):
     self._manager = metrics_manager
     self._stale_game_timeout_sec = stale_game_timeout_sec
     self._game_last_seen_unix = game_last_seen_unix
@@ -167,6 +167,12 @@ class ServerMetricsCollector:
     local_snapshot = self.build_local_snapshot(game_last_seen_unix, game_move_counts)
     return await self._manager.snapshot(local_snapshot)
 
+  async def clear_worker_metrics(self) -> None:
+    await self._manager.clear_all_workers()
+
+  async def should_clear_worker_metrics_on_startup(self, lock_ttl_seconds:int=300) -> bool:
+    return await self._manager.acquire_startup_cleanup_lock(lock_ttl_seconds)
+
   def build_prometheus_metrics(self, snapshot:dict) -> str:
     lines = [
       '# HELP snake_games_started_total Total games started by snake server.',