code: def _fetch_events_files_on_disk(self):
      
      all_files = tf.io.gfile.listdir(self._events_directory)
      relevant_files = [
          file_name for file_name in all_files
          if _DEBUGGER_EVENTS_FILE_NAME_REGEX.match(file_name)
      ]
      return sorted(relevant_files, key=self._obtain_file_index)
docs: Obtains the names of debugger-related events files within the directory.
  
      Returns:
        The names of the debugger-related events files written to disk. The names
        are sorted in increasing events file index.