code: def save_metrics(self, start_time: float, timeout: float = 900):
      self.run_prepare_command(
          f"python prometheus_metrics.py {start_time}", timeout=timeout
      )
  
imports: import json
  import os
  import tempfile
  from typing import TYPE_CHECKING, Any, Dict, Optional
  from ray_release.cluster_manager.cluster_manager import ClusterManager
  from ray_release.command_runner.command_runner import CommandRunner
  from ray_release.exception import ClusterNodesWaitTimeout, CommandError, CommandTimeout, LocalEnvSetupError, LogsError, FetchResultError
  from ray_release.file_manager.file_manager import FileManager
  from ray_release.job_manager import JobManager
  from ray_release.logger import logger
  from ray_release.util import format_link, get_anyscale_sdk
  from ray_release.wheels import install_matching_ray_locally
label_desc: Use image node_id 6 for calling the JobRunner obj's underlying member method code with example usage: obj.save_metrics(start_time, timeout) without return types