AI-generated Key Takeaways
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          Describes a single operation for creating, updating, or removing a campaign. 
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          The update_maskfield uses a FieldMask to specify which resource fields are modified during an update.
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          The operationunion field indicates the type of mutate operation, which can becreate,update, orremove.
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          The createoperation expects no resource name, while theupdateoperation requires a valid resource name, and theremoveoperation requires a resource name in a specific format.
A single operation (create, update, remove) on a campaign.
| Fields | |
|---|---|
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 | FieldMask that determines which resource fields are modified in an update. | 
| Union field 
 | |
| 
 | Create operation: No resource name is expected for the new campaign. | 
| 
 | Update operation: The campaign is expected to have a valid resource name. | 
| 
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 Remove operation: A resource name for the removed campaign is expected, in this format: 
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