Update README.md

Author: tomnight

README.md

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 > Currently, the data lake solution can be deployed in the following regions: [ us-east-1, us-east-2, us-west-2, eu-west-1, eu-west-2, eu-central-1, ap-northeast-1, ap-northeast-2, ap-southeast-2, ap-south-1 ]
 
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+## Collection of operational metrics
+This solution collects anonymous operational metrics to help AWS improve the quality and features of the solution. For more information, including how to disable this capability, please see the [implementation guide](https://docs.aws.amazon.com/solutions/latest/data-lake-solution/appendix-d.html).
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