> [!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/LineupAttributeMetadata).

Metadata associated with a Lineup attribute.

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

| Fields ||
|---|---|
| ## `channel_count_lower_bound` | `int64` The lower end of a range containing the number of channels in the lineup. |
| ## `channel_count_upper_bound` | `int64` The upper end of a range containing the number of channels in the lineup. |
| ## `inventory_country` | `LocationInfo` The national market associated with the lineup. |
| ## `median_monthly_inventory` | `int64` The median number of impressions per month on this lineup. |
| ## `sample_channels[]` | `SampleChannel` Examples of channels that are included in the lineup. |