Amazon Cognito now supports CloudWatch Usage Metrics
Amazon Cognito now supports CloudWatch Usage Metrics, making it easier for administrators to monitor, report and take automatic actions in case of an event in near real time. AWS customers can create CloudWatch dashboards for Amazon Cognito sign in and sign up metrics, and they can create CloudWatch alarms to watch specific metrics. This feature is available now in Amazon Cognito User Pools at no additional cost.
Source:: Amazon AWS