You can now use Amazon CloudWatch to track metrics related to VPC Traffic Mirroring. You can collect information such as amount of traffic mirrored or not mirrored on your network interface that is part of a traffic mirror session. You can also set up CloudWatch Alarms to receive notifications on any metrics crossing pre-defined thresholds. To get started with these metrics, see Monitoring Mirrored Traffic Using Amazon CloudWatch.
Source:: Amazon AWS