/// <summary>
/// 获得 MachineGroup 下属于用户并与 Server 端连接的机器状态信息。
/// </summary>
/// <param name="client">client实例。</param>
/// <param name="groupName">用于过滤的机器组名称（支持部分匹配）。</param>
/// <param name="offset">返回记录的起始位置，默认为 0。</param>
/// <param name="size">每页返回最大条目，默认 500（最大值）。</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.ListMachinesAsync"/>
public static Task <IResponse <ListMachinesResult> > ListMachinesAsync(this ILogServiceClient client,
String groupName,
Int32 offset = ListMachinesRequest.DefaultOffset, Int32 size = ListMachinesRequest.DefaultSize, String project = null)
=> client.ListMachinesAsync(new ListMachinesRequest(groupName)
{
Offset = offset,
Size = size,
ProjectName = project
});