AWS Certified Solutions Architect Associate Test 10

Explanation:
Monitoring Volumes with CloudWatch
CloudWatch metrics are statistical data that you can use to view, analyze, and set alarms on theoperational behavior of your volumes. The following table describes the types of monitoring dataavailable for your Amazon EBS volumes:
Basic
Data is available automatically in 5-minute periods at no charge. This includes data for the rootdevice volumes for EBS- backed instances.
Detailed
Provisioned IOPS SSD (io1) volumes automatically send one-minute metrics to CloudWatch.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-volume-status.html