code: def kill_master(self) -> None:
      if self.is_circleci_job:
          # Use the pre-installed determined master service when running the tests as part of a
          # CircleCI job.
          subprocess.run(
              sh_split("sudo systemctl stop determined-master")
          )
      else:
          # Use the local instance of devcluster.
          if self.dc:
              self.dc.kill()
          self.dc = None
      time.sleep(10)
  
imports: import os
  import subprocess
  import time
  from shlex import split
  from typing import Any, Iterator
  import pytest
  from tests import config
  from .abstract_cluster import Cluster
  from .utils import now_ts
label_desc: Use image node_id 4 for calling the ManagedSlurmCluster obj's underlying member method code with example usage: obj.kill_master() without return types