Amazon S3 request-level information on use of access control lists (ACLs) coming to S3 server access logs and AWS CloudTrail
Amazon S3 server access logs and AWS CloudTrail logs will soon contain information to identify S3 requests that rely upon an access control list (ACL) for authorization to succeed. This feature, which will be activated over the next few weeks, will provide you with information that will simplify the process of adopting the S3 security best practice of disabling ACLs.