Application Auto Scaling now publishes notifications to the AWS Personal Health Dashboard and AWS Health API when a scale-out operation for one of your Amazon DynamoDB Tables or Global Secondary Indexes is prevented because a DynamoDB throughput service limit has been reached. This gives you actionable feedback to request a service-limit increase.

from Recent Announcements: https://aws.amazon.com/about-aws/whats-new/2019/12/application-auto-scaling-provides-notifications-via-aws-health-service/