code: def fetch_config_reattach_wait(self) -> float:
      s = self.fetch_config()["resource_pools"][0][
          "agent_reconnect_wait"
      ]
      return float(s.rstrip("s"))
  
imports: import json
  import os
  import subprocess
  import time
  from typing import Any, Dict, Iterator, List, Union, cast
  import pytest
  from tests import config
  from .abstract_cluster import Cluster
  from .test_users import logged_in_user
  from .utils import now_ts, set_master_port
label_desc: Use image node_id 14 for calling the ManagedCluster obj's underlying member method code with example usage: obj.fetch_config_reattach_wait() and returns: float