code: def gen_uid(session_id):
      return f"{session_id}_lifecycle_tracker"
  
imports: import asyncio
  import itertools
  import logging
  from collections import defaultdict
  from typing import Dict, List, Optional
  from ....None import oscar
  from ....lib.aio import alru_cache
  from ...meta.api import MetaAPI
  from ...storage.api import StorageAPI
  from ..errors import TileableNotTracked
label_desc: Use image node_id 2 for calling the LifecycleTrackerActor obj's underlying member method code with example usage: obj.gen_uid(session_id) and returns: session_id, str