The aggregation to apply on the filtered events to calculate the meter.
value: models.PropertyAggregation = /* values here */value: models.CountAggregation = /* values here */value: models.PropertyAggregation = /* values here */value: models.PropertyAggregation = /* values here */value: models.PropertyAggregation = /* values here */value: models.UniqueAggregation = /* values here */