Symptom
We can see in collector an Excessive amount of Flows Per Second reported as soon as ETA is enabled in the switch. when ETA is enabled, FPS starts to increase significantly over time.
Conditions
FNF + AVC + ETA configuration (Issue seen as soon as ETA is configured)
Workaround
The behavior can be avoided if we remove Flexible Netflow (FNF)
Further Problem Description
FNF + AVC + ETA causing stale flows, it means that flows will be sent to collector over and over again causing the behavior seen.