public DescribeAlarmsRequest withActionPrefix(String actionPrefix) {
        setActionPrefix(actionPrefix);
        return this;
    }
<p>
Use this parameter to filter the results of the operation to only those alarms that use a certain alarm action.
For example, you could specify the ARN of an SNS topic to find all alarms that send notifications to that topic.
</p>

@param actionPrefix
       Use this parameter to filter the results of the operation to only those alarms that use a certain alarm
       action. For example, you could specify the ARN of an SNS topic to find all alarms that send notifications
       to that topic.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-cloudwatch/src/main/java/com/amazonaws/services/cloudwatch/model/DescribeAlarmsRequest.java