You can use the metrics for monitoring and to drive auto-scaling through alerts.
Caution: Exporting custom metrics may incur significant Monitoring costs.
Please review Amazon's CloudWatch pricing. By default no metrics are
exported; change that using
Make sure the IAM account has these permissions:
Update the service configuration.
--cloudwatch_*flags for details.
Update the cluster.
--cloudwatch_metrics_filter you can select exactly which
metrics are exported. (By default no metric is exported.) Reporting more
metrics may increase your monitoring bill; consult the AWS CloudWatch pricing