code: def instance(self) -> SSHManager:
      return self._ssh_manager
  
file_path: superset/superset/extensions/ssh.py
imports: import logging
  from io import StringIO
  from typing import TYPE_CHECKING
  import sshtunnel
  from flask import Flask
  from paramiko import RSAKey
  from superset.databases.utils import make_url_safe
  from superset.utils.class_utils import load_class_from_name
label_desc: Use image node_id 3 for calling the SSHManagerFactory obj's underlying member method code with example usage: obj.instance() and returns: self