> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v24** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/MetricAttributes.Attribute).

The attribute of the metric in key value pair format.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v24/services/google_ads_service.proto)

| Fields ||
|---|---|
| ## `key` | `string` The key of the attribute. |
| ## `value` | `string` The value of the attribute. |