workshop07- monitor dropped packets in a network traffic flow

Jarle Søberg, Kjetil H. Hernes, Matti Siekkinen, Vera Goebel, Thomas Plagemann, "A Practical Evaluation of Load Shedding in Data Stream Management Systems for Network Monitoring", in some workshop, may 2007, Italy

This is only a paper that can give an example how to monitor dropped packets in a network traffic stream. They suggest that TelegraphCQ does not count correctly the number of packets dropped and that STREAM does not have a mechanism for load shedding. What about the sample operator in STREAM ?!