public void setGroupBy(String groupBy) {
        this.groupBy = groupBy;
    }
<p>
The grouping of recommendations by a dimension.
</p>

@param groupBy
       The grouping of recommendations by a dimension.
aws-java-sdk-costoptimizationhub/src/main/java/com/amazonaws/services/costoptimizationhub/model/ListRecommendationSummariesRequest.java