public java.util.List<Integer> getCheckpointPercentages() {
        if (checkpointPercentages == null) {
            checkpointPercentages = new com.amazonaws.internal.SdkInternalList<Integer>();
        }
        return checkpointPercentages;
    }
<p>
(Optional) Threshold values for each checkpoint in ascending order. Each number must be unique. To replace all
instances in the Auto Scaling group, the last number in the array must be <code>100</code>.
</p>
<p>
For usage examples, see <a
href="https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-adding-checkpoints-instance-refresh.html">Add
checkpoints to an instance refresh</a> in the <i>Amazon EC2 Auto Scaling User Guide</i>.
</p>

@return (Optional) Threshold values for each checkpoint in ascending order. Each number must be unique. To
        replace all instances in the Auto Scaling group, the last number in the array must be <code>100</code>
        .</p>
        <p>
        For usage examples, see <a href=
        "https://docs.aws.amazon.com/autoscaling/ec2/userguide/asg-adding-checkpoints-instance-refresh.html">Add
        checkpoints to an instance refresh</a> in the <i>Amazon EC2 Auto Scaling User Guide</i>.
aws-java-sdk-autoscaling/src/main/java/com/amazonaws/services/autoscaling/model/RefreshPreferences.java