/// <summary>
 /// 将配置应用到机器组。
 /// </summary>
 /// <param name="client">client实例。</param>
 /// <param name="groupName">机器分组名称。</param>
 /// <param name="configName">日志配置名称。</param>
 /// <param name="project">项目名,此参数将覆盖 client 中默认设置。</param>
 /// <returns>异步响应结果。</returns>
 /// <seealso cref="ILogServiceClient.ApplyConfigToMachineGroupAsync"/>
 public static Task <IResponse> ApplyConfigToMachineGroupAsync(this ILogServiceClient client,
                                                               String groupName, String configName,
                                                               String project = null)
 => client.ApplyConfigToMachineGroupAsync(new ApplyConfigToMachineGroupRequest(groupName, configName)
 {
     ProjectName = project
 });