public GetReservationUtilizationRequest withGroupBy(java.util.Collection<GroupDefinition> groupBy) {
        setGroupBy(groupBy);
        return this;
    }
<p>
Groups only by <code>SUBSCRIPTION_ID</code>. Metadata is included.
</p>

@param groupBy
       Groups only by <code>SUBSCRIPTION_ID</code>. Metadata is included.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-costexplorer/src/main/java/com/amazonaws/services/costexplorer/model/GetReservationUtilizationRequest.java