class_docstr: The `RuntimeManager` can be used for a simplified resource management.
  
  It aims to automatically detect valid `Runtimes` based on the ssh configuration.
  It can be used to create a `RuntimeGroup` based on the automatically detected
  instances and possibly based on further filters such as GPU availability.
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code: def __repr__(self) -> str:
      return "%s(%r)" % (self.__class__, self.__dict__)
  
imports: import atexit
  import logging
  import warnings
  from copy import deepcopy
  from multiprocessing import Pool, Process
  from typing import Dict, Generator, List, Optional, Union
  from storm import Storm
  from lazycluster import _utils
  from lazycluster.exceptions import InvalidRuntimeError, NoPortsLeftError, NoRuntimesDetectedError, PortInUseError
  from lazycluster.runtimes import Runtime, RuntimeTask
label_desc: Use image node_id 2 for calling the RuntimeManager obj's underlying member method code with example usage: obj.__repr__() and returns: unknown