code: def start_monitor(redis_address,
                    stdout_file=None,
                    stderr_file=None,
                    autoscaling_config=None,
                    redis_password=None):
      
      monitor_path = os.path.join(
          os.path.dirname(os.path.abspath(__file__)), "monitor.py")
      command = [
          sys.executable, "-u", monitor_path,
          "--redis-address=" + str(redis_address)
      ]
      if autoscaling_config:
          command.append("--autoscaling-config=" + str(autoscaling_config))
      if redis_password:
          command.append("--redis-password=" + redis_password)
      process_info = start_ray_process(
          command,
          ray_constants.PROCESS_TYPE_MONITOR,
          stdout_file=stdout_file,
          stderr_file=stderr_file)
      return process_info
docs: Run a process to monitor the other processes.
  
      Args:
          redis_address (str): The address that the Redis server is listening on.
          stdout_file: A file handle opened for writing to redirect stdout to. If
              no redirection should happen, then this should be None.
          stderr_file: A file handle opened for writing to redirect stderr to. If
              no redirection should happen, then this should be None.
          autoscaling_config: path to autoscaling config file.
          redis_password (str): The password of the redis server.
  
      Returns:
          ProcessInfo for the process that was started.