| Interface | Description | 
|---|---|
| GroupByQueryMetrics | 
 Specialization of  
QueryMetrics for GroupByQuery. | 
| GroupByQueryMetricsFactory | 
 Implementations could be injected using
 PolyBind
    .optionBinder(binder, Key.get(GroupByQueryMetricsFactory.class))
    .addBinding("myCustomGroupByQueryMetricsFactory")
    .to(MyCustomGroupByQueryMetricsFactory.class);
 And then setting property:
 druid.query.groupBy.queryMetricsFactory=myCustomGroupByQueryMetricsFactory 
 | 
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