In D15518#425977, @tomek wrote:

Does that mean that non-Fargate logs would also go to the Fargate groups?
Do we plan to simplify the names after the migration?

No, it means non-Fargate logs would be ignored and won't cause alarms. Additionally, non-Fargate log groups are going to be removed when EC2 resources are shut down.
The names will stay as it is, performing migrations with the same names could be a lot more complex