- outline
Retention of metrics stored in Amazon CloudWatch is differ from datapoints. As of November 2016, it has changed from 14 days to a maximum of 15 months.
- retentions
1 minute datapoints are available for 15 days
5 minute datapoints are available for 63 days
1 hour datapoints are available for 455 day
- reference
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_concepts.html#Metric
aws.amazon.com/ko/about-aws/whats-new/2016/..