class_docstr: InstanceReconciler is responsible for reconciling the difference between
  node provider and instance storage. It is also responsible for handling
  failures.
code: def shutdown(self):
      with self._reconcile_timer_lock:
          self._reconcile_timer.cancel()
  
file_path: ray/python/ray/autoscaler/v2/instance_manager/subscribers/reconciler.py
imports: import logging
  import threading
  from concurrent.futures import ThreadPoolExecutor
  from typing import List
  from ray.autoscaler.v2.instance_manager.instance_storage import InstanceStorage, InstanceUpdatedSubscriber
  from ray.autoscaler.v2.instance_manager.node_provider import NodeProvider
  from ray.core.generated.instance_manager_pb2 import Instance, InstanceUpdateEvent
label_desc: Use image node_id 2 for calling the InstanceReconciler obj's underlying member method code with example usage: obj.shutdown() without return types