aws_e2e_ecs.js only runs on Ubuntu 18.04, currently. That distro only gets run on the 5.0 and 6.0 Evergreen projects, which means that the test is only run for 5.0 and 6.0.

The test has started failing regularly on those branches due to SSH issues. The default Evergreen SSH key was revoked recently, which means that the current 18.04 container images have to be rebuilt by the Runtime Environments team for that test to be able to SSH again successfully.

For AWS-IAM test coverage, it is sufficient if aws_e2e_ec2.js and aws_e2e_assume_role.js are operational as they cover regular and temporary credential flows, respectively.