public void setDisplayName(String displayName) {
        this.displayName = displayName;
    }
<p>
Field represents a friendly name in the console for the custom metric; doesn't have to be unique. Don't use this
name as the metric identifier in the device metric report. Can be updated.
</p>

@param displayName
       Field represents a friendly name in the console for the custom metric; doesn't have to be unique. Don't
       use this name as the metric identifier in the device metric report. Can be updated.
aws-java-sdk-iot/src/main/java/com/amazonaws/services/iot/model/DescribeCustomMetricResult.java