New Amazon CloudWatch metric monitors EC2 instance reachability to EBS volumes

Starting today, we are introducing a new Amazon CloudWatch metric called Attached EBS Status Check to monitor if one or more Amazon EBS volumes attached to your EC2 instances are reachable and able to complete I/O operations. With this new metric, you can now quickly detect and respond to any EBS impairments that may potentially be impacting the performance of your applications running on Amazon EC2 instances. 

Source:: Amazon AWS