code: def generate_user_agent(extra_ids = [], include_utilities = true)
        agent_app = @config.read('authentication.application_name')
        extra_ids << ["AdManagerApi-Ruby/%s" %
            AdManagerApi::ApiConfig::CLIENT_LIB_VERSION]
        utility_registry = AdManagerApi::Utils::UtilityRegistry.instance
        extra_ids += utility_registry.extract!.to_a if include_utilities
        super(extra_ids, agent_app)
      end
docs: Generates string to use as user agent in headers.