Symptom
With QOS policy configured on Cat9k, polling of CISCO-CLASS-BASED-QOS-MIB, the following objects didn't work:
1. cbQosCMPrePolicyByte64 , cbQosCMPostPolicyByte64 are reporting 0 bytes.
2. cbQosCMDropByte64 shows only the drops due to police and does not consider queue drops
Workaround
Use platform CLI to get the qos counters: "show platform hardware fed switch active qos queue stats interfaces <interface_name"
