Forecast intervals.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/enums/keyword_plan_forecast_interval.proto)

| Enums ||
|---|---|
| ## `NEXT_MONTH` | The next month date range for keyword plan. |
| ## `NEXT_QUARTER` | The next quarter date range for keyword plan. |
| ## `NEXT_WEEK` | The next week date range for keyword plan. The next week is based on the default locale of the user's account and is mostly SUN-SAT or MON-SUN. This can be different from next-7 days. |
| ## `UNKNOWN` | The value is unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |