public String getIamRoleArn() {
        return this.iamRoleArn;
    }
<p>
This field appears only when the destination is <code>Evidently</code>. It specifies the ARN of the IAM role that
is used to write to the Evidently experiment that receives the metrics.
</p>

@return This field appears only when the destination is <code>Evidently</code>. It specifies the ARN of the IAM
        role that is used to write to the Evidently experiment that receives the metrics.
aws-java-sdk-cloudwatchrum/src/main/java/com/amazonaws/services/cloudwatchrum/model/MetricDestinationSummary.java