Access Transparency is a part of Google's long-term commitment to transparency and user trust. Access Transparency logs record the actions that Google personnel take when accessing customer content.
The only customer core content that Storage Transfer Service stores are third-party credentials, such as access keys for S3 or Azure. While our administrators cannot access these credentials, you can further enhance your security by using Secret Manager to store your credentials instead of passing them to the job creation command directly. This is the recommended approach. See the instructions for using secrets in Storage Transfer Service for Azure or for AWS S3.