code: def use_absl_handler():
    
    absl_handler = get_absl_handler()
    if absl_handler not in logging.root.handlers:
      logging.root.addHandler(absl_handler)
      FLAGS['verbosity']._update_logging_levels()
docs: Uses the ABSL logging handler for logging if not yet configured.
  
    The absl handler is already attached to root if there are no other handlers
    attached when importing this module.
  
    Otherwise, this method is called in app.run() so absl handler is used.