The above email notification suggests that the Amazon Linux 2 standard 3.0 image for AWS Codebuild is deprecating soon. Please note that generally, this email is rolled out only for the AWS accounts which may have this image provisioned as part of a Codebuild project.
To check further if a particular account is affected, you could navigate to the AWS Health Dashboard  where you can view the overall status of AWS services, and you can sign in to view personalized communications about your particular AWS account or organization.
Additionally, you could also view your build project's details using the 'batch-get-projects' AWS CLI command  where you would be able to observe the image used by a particular project. That being said, if you might be unaware about the images used by Codebuild, you could create a custom shell script by referring to documentation  which can enumerate the projects in the current region for the current account, and print the image used by each project.
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