code: def _start(self) -> None:
      logger.info("Starting system asset monitoring threads")
      for asset in self.assets:
          asset.start()
  
      # compatibility mode: join stats from different assets before publishing
      if not (self.join_assets and self.asset_interface is not None):
          return None
  
      # give the assets a chance to accumulate and publish their first stats
      # this will provide a constant offset for the following accumulation events below
      self._shutdown_event.wait(
          self.publishing_interval
          * self.PUBLISHING_INTERVAL_DELAY_FACTOR
      )
  
      logger.debug("Starting system metrics aggregation loop")
  
      while not self._shutdown_event.is_set():
          self.publish_telemetry()
          self.aggregate_and_publish_asset_metrics()
          self._shutdown_event.wait(self.publishing_interval)
  
      logger.debug("Finished system metrics aggregation loop")
  
      # try to publish the last batch of metrics + telemetry
      try:
          logger.debug("Publishing last batch of metrics")
          # publish telemetry
          self.publish_telemetry()
          self.aggregate_and_publish_asset_metrics()
      except Exception as e:
          logger.error(f"Error publishing last batch of metrics: {e}")
  
imports: import datetime
  import logging
  import queue
  import threading
  from collections import defaultdict, deque
  from typing import TYPE_CHECKING, Deque, Dict, List, Optional, Tuple
  from .assets.asset_registry import asset_registry
  from .assets.interfaces import Asset, Interface
  from .assets.open_metrics import OpenMetrics
  from .system_info import SystemInfo
label_desc: Use image node_id 6 for calling the SystemMonitor obj's underlying member method code with example usage: obj._start() and returns: None