Possible serving statuses of a campaign.

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

| Enums ||
|---|---|
| ## `ENDED` | Ended. |
| ## `NONE` | None. |
| ## `PENDING` | Pending. |
| ## `SERVING` | Serving. |
| ## `SUSPENDED` | Suspended. |
| ## `UNKNOWN` | The received value is not known in this version. This is a response-only value. |
| ## `UNSPECIFIED` | No value has been specified. |