A single operation (create, remove, update) on an ad group criterion.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/services/ad_group_criterion_service.proto)

| Fields ||
|---|---|
| ## `exempt_policy_violation_keys[]` | `https://developers.google.com/google-ads/api/reference/rpc/v25/PolicyViolationKey` 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. |
| ## `operation` Union field. The mutate operation. `operation` can be only one of the following: ||
| ### `create` | `https://developers.google.com/google-ads/api/reference/rpc/v25/AdGroupCriterion` Create operation: No resource name is expected for the new criterion. |
| ### `remove` | `string` Remove operation: A resource name for the removed criterion is expected, in this format: `customers/{customer_id}/adGroupCriteria/{ad_group_id}~{criterion_id}` |
| ### `update` | `https://developers.google.com/google-ads/api/reference/rpc/v25/AdGroupCriterion` Update operation: The criterion is expected to have a valid resource name. |
| ## `update_mask` | `https://protobuf.dev/reference/protobuf/google.protobuf#field-mask` FieldMask that determines which resource fields are modified in an update. |