code: def test_warning_for_dead_autoscaler(ray_start_regular, error_pubsub):
      # Terminate the autoscaler process.
      from ray._private.worker import _global_node
  
      autoscaler_process = _global_node.all_processes[
          ray_constants.PROCESS_TYPE_MONITOR
      ][0].process
      autoscaler_process.terminate()
  
      # Confirm that we receive an autoscaler failure error.
      errors = get_error_message(
          error_pubsub, 1, ray_constants.MONITOR_DIED_ERROR, timeout=5
      )
      assert len(errors) == 1
  
      # Confirm that the autoscaler failure error is stored.
      error = _internal_kv_get(DEBUG_AUTOSCALING_ERROR)
      assert error is not None
  
imports: import os
  import signal
  import sys
  import threading
  import time
  import numpy
  import pytest
  import ray
  import ray._private.ray_constants
  import ray._private.utils
  from ray._private.ray_constants import DEBUG_AUTOSCALING_ERROR
  from ray._private.test_utils import Semaphore, get_error_message, get_log_batch, init_error_pubsub, run_string_as_driver_nonblocking, wait_for_condition
  from ray.cluster_utils import cluster_not_supported
  from ray.experimental.internal_kv import _internal_kv_get
label_desc: Use image node_id 4 for calling a global function with example usage: test_warning_for_dead_autoscaler(ray_start_regular, error_pubsub) without return types