code: def aggregate_and_publish_asset_metrics(self) -> None:
      if self.asset_interface is None:
          return None
      # only extract as many items as are available in the queue at the moment
      size = self.asset_interface.metrics_queue.qsize()
  
      aggregated_metrics = {}
      for _ in range(size):
          item = self.asset_interface.metrics_queue.get()
          aggregated_metrics.update(item)
  
      if aggregated_metrics:
          # update buffer:
          # todo: get it from publish_stats instead?
          #  either is not too accurate, just use wandb-core!
          t = datetime.datetime.now().timestamp()
          for k, v in aggregated_metrics.items():
              self.buffer[k].append((t, v))
          # publish aggregated metrics
          self.backend_interface.publish_stats(aggregated_metrics)
  
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 4 for calling the SystemMonitor obj's underlying member method code with example usage: obj.aggregate_and_publish_asset_metrics() and returns: None