AWS Shield Advanced now allows you to bundling resources into protection groups, giving you a self-service way to customize the scope of detection and mitigation for your application by treating multiple resources as a single unit. Resource grouping improves the accuracy of detection, reduces false positives, eases automatic protection of newly created resources, and accelerates the time to mitigate attacks against multiple resources. For example, if an application consists of four CloudFront distributions, you can add them to one protection group to receive detection and protection for the collection of resources as a whole. Reporting can be consumed at the protection group level, in addition to the resource level, giving a more holistic view of overall application health.
Source:: Amazon AWS