CloudWatch Application Insights adds EBS volume and API Gateway metrics
Amazon CloudWatch Application Insights, adds additional storage volume metrics to provide further insights to your storage performance and health along with the new ability to monitor your API Gateway functions. CloudWatch Application Insights is a capability that helps enterprise customers easily setup application monitoring and enhanced observability for AWS resources. The new Elastic Block Store (EBS) metrics provide further details on storage volumes. The integration with the API Gateway service provides insights to the various API commands run through the gateway.
Source:: Amazon AWS