AI-generated Key Takeaways
- 
          CollectionSizeError is a type of ApiError that is part of the SegmentPopulationService. 
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          It includes inherited fields from ApiError such as fieldPath, fieldPathElements, trigger, and errorString. 
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          The CollectionSizeError specifically has a 'reason' field which can be 'TOO_LARGE' or 'UNKNOWN'. 
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202411
| Field | |
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| ApiError(inherited) | |
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| CollectionSizeError | |
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 Enumerations 
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