Amazon CloudWatch Internet Monitor now allows you to customize thresholds for when to trigger a health event for the internet-facing traffic between your end users and your applications hosted on AWS. The default threshold for overall availability and performance scores to trigger a health event is 95%. Now, you can set a custom threshold for the availability score, performance score, or both. If your application is at or below the performance or availability threshold, you receive a notification of a health event that includes the impacted location and network provider (ASN).
Source:: Amazon AWS