Enum describing the possible ad group criterion primary status. Provides insight into why an ad group criterion is not serving or not serving optimally.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/enums/ad_group_criterion_primary_status.proto)

| Enums ||
|---|---|
| ## `ELIGIBLE` | The ad group criterion is eligible to serve. |
| ## `NOT_ELIGIBLE` | The ad group criterion is not eligible to serve. |
| ## `PAUSED` | The ad group criterion is paused. |
| ## `PENDING` | The ad group criterion is pending. |
| ## `REMOVED` | The ad group criterion is removed. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |