in src/aws/autoscaling.ts [26:34]
export function attachInstance(instance: Instance, asgName: string): Promise<{}> {
console.log(`Attaching ${instance.id} to ${asgName}.`);
const params = {
InstanceIds: [ instance.id ],
AutoScalingGroupName: asgName
};
const req = new AttachInstancesCommand(params)
return retry(() => awsAutoscaling.send(req), `attaching instance ${instance.id}`, 5)
}