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Do you mean the autoname suffix (https://www.pulumi.com/docs/intro/concepts/resources/names/#autonaming)?

@cuddly-alligator-37434 you can retrieve the ASG from within the user data:

# cloudformation stack name
STACK_NAME=$(aws ec2 describe-instances --instance-id $(curl -s <http://169.254.169.254/latest/dynamic/instance-identity/document> | jq .instanceId -r) --region eu-west-1 --query "Reservations[*].Instances[*].Tags[?Key=='aws:cloudformation:stack-name'].Value" --output text)
# aws region
REGION=$(curl -s <http://169.254.169.254/latest/dynamic/instance-identity/document> | jq .region -r)
# the name of the ASG this instance is in
ASG_NAME=$(aws ec2 describe-instances --instance-id $(curl -s <http://169.254.169.254/latest/dynamic/instance-identity/document> | jq .instanceId -r) --region eu-west-1 --query "Reservations[*].Instances[*].Tags[?Key=='aws:autoscaling:groupName'].Value" --output text)

@echoing-dinner-19531 thank you! as far as I could see, there is no option to do that on the autoscaling group (not on cluster.addAutoscalingGroup and cluster.createAutoScalingGroup)

you'll need to make sure it has an IAM role that allows it to read those values of course

Sure 🙂