With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cportQosDropPkts
cport Qos Drop Packets
1.3.6.1.4.1.9.9.189.1.3.2.1.7
The count of dropped packets as the result of queuing and scheduling related QoS features that can produce drops.
Back to CISCO-PORT-QOS-MIB MIB page.
IPHost Network monitor allows you to monitor cportQosDropPkts on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.