Set the standard early, enforce with whatever means necessary. It's a common practice to use tools like CloudCustodian to terminate instances that do not have i

Set the standard early, enforce with whatever means necessary. It's a common practice to use tools like CloudCustodian to terminate instances that do not have identified tags (with extreme prejudice). Also, normalize everything, and implement the standards/normalization using your build toolset (Jenkins/Terraform/CI du jour) to enforce this.