public void setStateReasonData(String stateReasonData) {
        this.stateReasonData = stateReasonData;
    }
<p>
An explanation for the alarm state, in JSON format.
</p>

@param stateReasonData
       An explanation for the alarm state, in JSON format.
aws-java-sdk-cloudwatch/src/main/java/com/amazonaws/services/cloudwatch/model/CompositeAlarm.java