public String getDestinationArn() {
        return this.destinationArn;
    }
<p>
This parameter is required if <code>Destination</code> is <code>Evidently</code>. If <code>Destination</code> is
<code>CloudWatch</code>, do not use this parameter.
</p>
<p>
This parameter specifies the ARN of the Evidently experiment that is to receive the metrics. You must have
already defined this experiment as a valid destination. For more information, see <a
href="https://docs.aws.amazon.com/cloudwatchrum/latest/APIReference/API_PutRumMetricsDestination.html"
>PutRumMetricsDestination</a>.
</p>

@return This parameter is required if <code>Destination</code> is <code>Evidently</code>. If
        <code>Destination</code> is <code>CloudWatch</code>, do not use this parameter.</p>
        <p>
        This parameter specifies the ARN of the Evidently experiment that is to receive the metrics. You must
        have already defined this experiment as a valid destination. For more information, see <a
        href="https://docs.aws.amazon.com/cloudwatchrum/latest/APIReference/API_PutRumMetricsDestination.html"
        >PutRumMetricsDestination</a>.
aws-java-sdk-cloudwatchrum/src/main/java/com/amazonaws/services/cloudwatchrum/model/UpdateRumMetricDefinitionRequest.java