protected void decorate(MeterEntity entity) {
        attr0 = entity.getAttr0();
        attr1 = entity.getAttr1();
        attr2 = entity.getAttr2();
        attr3 = entity.getAttr3();
        attr4 = entity.getAttr4();
        attr5 = entity.getAttr5();
    }
Decorate the metric with the entity attributes.
Only single value metrics can be decorated.
Because we only support query the decorated condition in top_n query for now.
@param entity The metric entity
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/meter/Meter.java