Cost of Amazon CloudFront additional metrics

Amazon CloudWatch custom metric pricing is

Number of distributions you activated this for X 8 (up to 8 metrics, depends on the actual events types that occur) X 0.30$

• if they use Amazon CloudWatch API there will be a retrieval fee - 0.01$ per 1000 requests

From the documentation: https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/viewing-cloudfront-metrics.html#monitoring-console.distributions-additional-pricing When you enable additional metrics for a distribution, Amazon CloudFront sends up to 8 metrics to Amazon CloudWatch in the US East (N. Virginia) Region. Amazon CloudWatch charges a low, fixed rate for each metric. This rate is charged only once per month, per metric (up to 8 metrics per distribution). This is a fixed rate, so your cost remains the same regardless of the number of requests or responses that the Amazon CloudFront distribution receives or sends. For the per-metric rate, see the Amazon CloudWatch pricing page and the Amazon CloudWatch pricing calculator. Additional API charges apply when you retrieve the metrics with the Amazon CloudWatch API.