feat AUTO-695: add loaded_at attribute to AutoScalerData and Metrics classes

lib/metrics.py

@@ -146,6 +146,7 @@ class Metrics:
     def _set_mtoken(self, mtoken: str) -> None:
         self.mtoken = mtoken
 
+
     #######################################Private#######################################
 
     async def __send_delete_requests_and_reset(self):
@@ -280,7 +281,6 @@ class Metrics:
 
         if sent:
             # clear the one-shot loadtime only if we actually sent *this* value
-            self.system_metrics.reset(expected=loadtime_snapshot)
             self.update_pending = False
             self.model_metrics.reset()
             self.last_metric_update = time.time()