AI-generated Key Takeaways
- 
          ChangeHistoryOperation describes an operation performed on an entity. 
- 
          Possible ChangeHistoryOperation values include CREATE, UPDATE, DELETE, and UNKNOWN. 
- 
          UNKNOWN is returned if the actual value is not exposed by the API version. 
                  Service
               
               
                  PublisherQueryLanguageService
               
            
                  Dependencies
               
               
                  ChangeHistoryValue
                  
            ▼
                  ChangeHistoryOperation
               An operation that was performed on an entity.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202505
| Enumeration | Description | 
|---|---|
| CREATE | |
| UPDATE | |
| DELETE | |
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |