AI-generated Key Takeaways
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          A single operation can be performed on an ad group criterion, including create, remove, or update. 
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          An update_maskuses a FieldMask to specify which resource fields are modified during an update operation.
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          exempt_policy_violation_keysallows specifying policy violation keys that should not trigger an error, though violating resources may not serve.
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          The operationunion field determines the type of mutate operation being performed on the ad group criterion.
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          Each operation type ( create,update,remove) requires specific information, such as a resource name for update and remove, but not for create.
A single operation (create, remove, update) on an ad group criterion.
| Fields | |
|---|---|
| 
 | FieldMask that determines which resource fields are modified in an update. | 
| 
 | The list of policy violation keys that should not cause a PolicyViolationError to be reported. Not all policy violations are exemptable, refer to the is_exemptible field in the returned PolicyViolationError. Resources violating these polices will be saved, but will not be eligible to serve. They may begin serving at a later time due to a change in policies, re-review of the resource, or a change in advertiser certificates. | 
| Union field 
 | |
| 
 | Create operation: No resource name is expected for the new criterion. | 
| 
 | Update operation: The criterion is expected to have a valid resource name. | 
| 
 | 
 Remove operation: A resource name for the removed criterion is expected, in this format: 
 |