/// <summary>
 /// 获得 MachineGroup 上已经被应用的配置名称。
 /// </summary>
 /// <param name="client">client实例。</param>
 /// <param name="groupName">机器分组名称。</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.GetAppliedConfigsAsync"/>
 public static Task <IResponse <GetAppliedConfigsResult> > GetAppliedConfigsAsync(this ILogServiceClient client,
                                                                                  String groupName,
                                                                                  String project = null)
 => client.GetAppliedConfigsAsync(new GetAppliedConfigsRequest(groupName)
 {
     ProjectName = project
 });