code: def poll(self, pattern: str) -> Optional[str]:
      paths = list(self.base_dir.glob(pattern))
      if not paths:
          return None
      return max(paths).name
  
file_path: aim/aim/sdk/reporter/file_manager.py
imports: from pathlib import Path
  from typing import Union, Optional
  from abc import abstractmethod
  import logging
label_desc: Use image node_id 3 for calling the LocalFileManager obj's underlying member method code with example usage: obj.poll(pattern) and returns: max, None