The Stop Instances action stops your EC2 Instances on demand.
It does this using the following endpoints in AWS’s EC2 API:
You may need the Stop Instances action to confirm the targeted EC2 Instances have finish stopping before moving onto the next action in a rule.
You can achieve this using the Stop Instances action’s Wait panel, pictured:
If you select Wait on Instance State, the action will wait until the
describeInstanceStatus endpoint returns