Amazon CloudWatch Anomaly Detection applies machine-learning algorithms to continuously analyze system and application metrics, determine a normal baseline, and surface anomalies with minimal user intervention. You can use Anomaly Detection to isolate and troubleshoot unexpected changes in your metric behavior, reducing the mean time to detect and resolve operational issues.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/10/amazon-cloudwatch-anomaly-detection-now-generally-available/