A customizer attribute. Use CustomerCustomizer, CampaignCustomizer, AdGroupCustomizer, or AdGroupCriterionCustomizer to associate a customizer attribute and set its value at the customer, campaign, ad group, or ad group criterion level, respectively.
| Attributed resources | 
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| customer | 
Fields from the above resources may be selected along with this
  resource in your SELECT and WHERE clauses. These fields will not segment
  metrics in your SELECT clause.
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