| Name | Type | Description | Notes |
|---|---|---|---|
| operation_type | string | The `operation_type` field is only necessary when adding or removing a specific unit when the targeted billable metric adopts a `unique_count_agg` aggregation method. In other cases, the `operation_type` field is not required. The valid values for the `operation_type` field are `add` or `remove`, which indicate whether the unit is being added or removed from the unique count aggregation, respectively. | [optional] |