public String getExpression() {
        return this.expression;
    }
<p>
The mathematical expression that defines the metric aggregation function. You can specify up to 10 variables per
expression. You can specify up to 10 functions per expression.
</p>
<p>
For more information, see <a
href="https://docs.aws.amazon.com/iot-sitewise/latest/userguide/quotas.html">Quotas</a> in the <i>IoT SiteWise
User Guide</i>.
</p>

@return The mathematical expression that defines the metric aggregation function. You can specify up to 10
        variables per expression. You can specify up to 10 functions per expression. </p>
        <p>
        For more information, see <a
        href="https://docs.aws.amazon.com/iot-sitewise/latest/userguide/quotas.html">Quotas</a> in the <i>IoT
        SiteWise User Guide</i>.
aws-java-sdk-iotsitewise/src/main/java/com/amazonaws/services/iotsitewise/model/Metric.java