The system 4, wherein said {TAIL ~ QoS event} includes at least a subset of link utilization rate, a queue length, or a packet loss rate exceeding a predetermined maximum threshold or falling below a predetermined minimum threshold for {HEAD ~ at least a predefined time period} 
The system 4 , wherein said { TAIL ~ QoS event } includes at least a subset of link utilization rate , a queue length , or a packet loss rate exceeding a predetermined maximum threshold or falling below a predetermined minimum threshold for { HEAD ~ at least a predefined time period }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD