@Override
    public String toString() {
        return this.value;
    }
<p>
The location where Amazon Pinpoint finds the value of a dimension to publish to Amazon CloudWatch. If you want Amazon
Pinpoint to use the message tags that you specify using an X-SES-MESSAGE-TAGS header or a parameter to the
SendEmail/SendRawEmail API, choose <code>messageTag</code>. If you want Amazon Pinpoint to use your own email
headers, choose <code>emailHeader</code>. If you want Amazon Pinpoint to use link tags, choose <code>linkTags</code>.
</p>
aws-java-sdk-pinpointemail/src/main/java/com/amazonaws/services/pinpointemail/model/DimensionValueSource.java