class_docstr: Extend Dask's Worker with routes to handle PubSub machinery
code: def publish_scheduler(self, name=None, publish=None):
      self.publish_to_scheduler[name] = publish
  
imports: from __future__ import annotations
  import asyncio
  import logging
  import threading
  import weakref
  from collections import defaultdict, deque
  from dask.utils import parse_timedelta
  from distributed.core import CommClosedError
  from distributed.metrics import time
  from distributed.protocol.serialize import to_serialize
  from distributed.utils import TimeoutError, sync, wait_for
label_desc: Use image node_id 4 for calling the PubSubWorkerExtension obj's underlying member method code with example usage: obj.publish_scheduler(name, publish) without return types