@Override
    public String toString() {
        return this.value;
    }
<p>
The type of data source of an export, can be one of the following:
</p>
<ul>
<li>
<p>
<code>METRICS_DATA</code> - The metrics export.
</p>
</li>
<li>
<p>
<code>MESSAGE_INSIGHTS</code> - The Message Insights export.
</p>
</li>
</ul>
aws-java-sdk-sesv2/src/main/java/com/amazonaws/services/simpleemailv2/model/ExportSourceType.java