AWS Cost Anomaly Detection - Net Amortized Cost vs Unblended Cost

Question

I am trying to set up AWS Cost Anomaly Detection to help detect anomalous spend patterns in my account. I have EC2 reservations in my account that are upfront costs at the start of the month that show up as large spikes in my monthly spend. I read in the AWS Cost Anomaly Detection documentation that it monitors net unblended cost data from Cost Explorer, however I would like it to instead monitor using net amortized cost data so that my spike from EC2 reservations at the start of each month are not detected as anomalies.

Is there any way to make sure that the AWS Cost Anomaly Detection service uses net amortized cost to monitor rather than the net unblended cost?

Accepted Answer

Hi

AWS Cost Anomaly Detection directly uses the **net unblended cost data** from Cost Explorer and cannot be configured to use net amortized cost.

* AWS Cost Anomaly Detection looks for unusual spikes in your spending.
* It uses your actual bill (net unblended costs) to spot these spikes because this shows exactly when you were charged.

> After your billing data is processed, AWS Cost Anomaly Detection runs approximately three times a day in order to monitor for anomalies in your net unblended cost data (that is, net costs after all applicable discounts are calculated). You might experience a slight delay in receiving alerts. Cost Anomaly Detection uses data from Cost Explorer, which has a delay of up to 24 hours. As a result, it can take up to 24 hours to detect an anomaly after a usage occurs. If you create a new monitor, it can take 24 hours to begin detecting new anomalies. For a new service subscription, 10 days of historical service usage data is needed before anomalies can be detected for that service.

There is workaround for the solution to try adjusting the thresholds, i never tried it But these resources may help you

Official Links:

https://docs.aws.amazon.com/cost-management/latest/userguide/manage-ad.html
https://docs.aws.amazon.com/cost-management/latest/userguide/ce-exploring-data.html

AWS Cost Anomaly Detection - Net Amortized Cost vs Unblended Cost

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