docs: def get_options():
      """Collect all the options info from the other modules."""
      options = collections.defaultdict(list)
      for opt_class in config_factory.get_options():
          if not issubclass(opt_class, config_base.Options):
              continue
          config_options = opt_class(None)
          options[config_options.group_name].extend(config_options.list())
      return [(key, value) for key, value in options.items()]