Settings to specify a single total traffic volume that will be used as the expected total future volume for a forecast adjustment.
For example, an adOpportunityCount of 3,000 indicates a forecast
goal for the targeting specified on the parent traffic forecast
segment of 3,000 ad opportunities over the entire duration of the
adjustment.
- Namespace
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https://www.google.com/apis/ads/publisher/v202502 
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                            The total ad opportunity count over the entire forecast adjustment date range. This attribute is required. 
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