aws ec2 create-spot-datafeed-subscription
Creates a data feed for Spot Instances, enabling you to view Spot Instance usage logs. AWS CLI reference
3 options Its page in the AWS CLI reference
Options
--bucketThe name of the Amazon S3 bucket in which to store the Spot Instance data feed.--dry-runChecks whether you have the required permissions for the action, without actually making the request, and provides an error response.--prefixThe prefix for the data feed file names.