Returns the QoS level. The Quality of Service (QoS) standard is a
means by which network equipment can identify and treat traffic
differently based on an identifier. As traffic enters the site, the
BIG-IP system can apply an iRule that sends the traffic to different
pools of servers based on the QoS level within a packet.
This is a BIG-IP version 4.X variable, provided for
backward-compatibility. You can use the equivalent 9.X command