Thanks @dknezic for that, I missed it. So to recap:- In Apigee Edge the smoothing algorithm is always applied- In Apigee X/Hybrid the smoothing algorithm applies only when UseEffectiveCount=false. When UseEffectiveCount=true, the spike arrest behaves...

Thanks @dknezic . Could you link to the docs that detail this behavior? All docs I've seen mention the smoothing algorithm.

Does the per-minute rate have the same smoothing logic as the per-second rate albeit over a second interval? So 300pm would allow up to 5 requests per second, even concurrently, but would reject a 6th request received in the same second?