Hello Peter Tiszabolgyi,
If your data is consolidated in CloudWatch, you could write a custom Mendix AWS connector to call AWS CloudWatch API GetMetricData and pull data to your Mendix application, store those data as anon-persistence entities, and display them accordingly on the client website.
Here is the document to Build an AWS Connector.
If real-time does not matter, the second solution is to stream the CloudWatch data into S3 and use the existing Mendix AWS connector for Amazon S3 to pull data to your Mendix application.
Regards,
Dat