AI-generated Key Takeaways
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          An Ad Group Criterion Customizer provides a customizer value for an associated CustomizerAttribute at the AdGroupCriterion level. 
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          The resource name follows a specific format including customer_id, ad_group_id, criterion_id, and customizer_attribute_id. 
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          The CustomizerAttribute linked to the ad group criterion and the value associated with it are required and immutable. 
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          The status of the ad group criterion customizer is an output-only field. 
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          The ad group criterion linked to the customizer attribute must be a keyword criterion. 
A customizer value for the associated CustomizerAttribute at the AdGroupCriterion level.
| Fields | |
|---|---|
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 Immutable. The resource name of the ad group criterion customizer. Ad group criterion customizer resource names have the form: 
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 Required. Immutable. The customizer attribute which is linked to the ad group criterion. | 
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 | Output only. The status of the ad group criterion customizer. | 
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 | Required. The value to associate with the customizer attribute at this level. The value must be of the type specified for the CustomizerAttribute. | 
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 Immutable. The ad group criterion to which the customizer attribute is linked. It must be a keyword criterion. |