2.1 - DevoFlow counters with threshold-based notification (Counters, Samples, Tags)
阈值通过流表的参数的形式传到数据平面，存储在自定义的元数据当中。
2.2 - DevoFlow aggregate monitoring with CountMin (Sketch)
测量任务：统计发送到某子网的不同流的个数。
2.1 - DevoFlow counters with threshold-based notification (Counters, Samples, Tags)
阈值通过流表的参数的形式传到数据平面，存储在自定义的元数据当中。
2.2 - DevoFlow aggregate monitoring with CountMin (Sketch)
测量任务：统计发送到某子网的不同流的个数。