cbQoS elements are showing spikes in data that don't correlate with real spike in device data or device usage.
QoS Post Policy Utilization Avg. % metric shows incorrect data spikes.
CA Performance Management releases r3.6 and earlier
Counter rollovers for 64bit counters.
We had previously implemented a solution to resolve spikes for 32bit counters for the same cbQoS metrics. The same fix was implemented for the 64bit counters used here.
Engineering provided a fix and once in place the fix resolved the spiking data problems.
The solution is an update to the Cisco QoS ClassMap Certifications to use MVEL code to resolved spikes from counter rollevers in data calcualations from snmpCounter64() functions.
This code only applies to CAPM r3.6 or higher and will be included in the r3.7 release.
See support for more information regarding defect DE379778, or install release r3.7 when available. The fix being included in that release can be confirmed in the Fixed Issues list for that release in its documentation.