Amazon Elastic Container Services (ECS) enables you to correlate container images pulled from ECR with scheduled tasks and where it is running, on Amazon EC2 or Fargate. Now you have visibility and an immutable attribute to identify where your container image has been deployed to track application adoption, incident response and lifecycle management.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/10/amazon-ecs-now-supports-ecs-image-sha-tracking/