AI-generated Key Takeaways
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          DeliveryForecastSource in Ad Manager API v202411 defines strategies for choosing traffic shapes to pace line item delivery. 
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          Available strategies include using historical traffic, projected future traffic, or a custom pacing curve. 
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          The UNKNOWNvalue indicates that the actual value is not exposed by the requested API version.
Strategies for choosing forecasted traffic shapes to pace line items.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202411
| Enumeration | Description | 
|---|---|
| HISTORICAL | The line item's historical traffic shape will be used to pace line item delivery. | 
| FORECASTING | The line item's projected future traffic will be used to pace line item delivery. | 
| CUSTOM_PACING_CURVE | A user specified custom pacing curve will be used to pace line item delivery. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |