rename Test file and add init file for metric backend to import all at once

server/metrics/backends/Template.py

@@ -1,13 +1,19 @@
 from typing import Any, Awaitable, cast
-import inspect, os
+import inspect, time, os
 
 class StoreTemplate:
   def __init__(self, backend:str="memory", key_prefix:str="snake:metrics:worker", worker_id:str|None=None, **kwargs):
     self.backend = (backend or "memory").strip().lower()
     self.key_prefix = key_prefix
-    self.worker_id = worker_id or f"{os.getpid()}"
+    self.worker_id = worker_id or f"{os.getpid()}-{int(time.time() * 1000)}"
     self.store = self
 
+  async def publish(self, worker_id:str, snapshot:dict) -> None:
+    raise NotImplementedError
+
+  async def load_all(self) -> list[dict]:
+    raise NotImplementedError
+
   async def publish_only(self, snapshot:dict) -> None:
     await self.store.publish(self.worker_id, snapshot)