Migrating your Amazon ECS deployment to the new ARN and resource ID format

Starting today you can opt in to a new Amazon Resource Name (ARN) and resource ID format for Amazon ECS tasks, container instances, and services. The new format enables the enhanced ability to tag resources in your cluster, as well as tracking the cost of services and tasks running in your cluster.

In most cases, you don’t need to change your system beyond opting in to the new format. However, if your deployment mechanism uses regular expressions to parse the old format ARNs or task IDs, this may be a breaking change. It may also be a breaking change if you were storing the old format ARNs and IDs in a fixed-width database field or data structure.

Full article at: https://aws.amazon.com/blogs/compute/migrating-your-amazon-ecs-deployment-to-the-new-arn-and-resource-id-format-2/