Channel controls for Demand Gen ad groups.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/resources/ad_group.proto)

| Fields ||
|---|---|
| ## `channel_config` | `https://developers.google.com/google-ads/api/reference/rpc/v26/DemandGenChannelConfigEnum.DemandGenChannelConfig` Output only. Channel configuration reflecting which field in the oneof is populated. |
| ## `channel_configuration` Union field. Oneof between the different channel control configuration options. `channel_configuration` can be only one of the following: ||
| ### `channel_strategy` | `https://developers.google.com/google-ads/api/reference/rpc/v26/DemandGenChannelStrategyEnum.DemandGenChannelStrategy` High level channel strategy. |
| ### `selected_channels` | `https://developers.google.com/google-ads/api/reference/rpc/v26/AdGroup.DemandGenAdGroupSettings.DemandGenChannelControls.DemandGenSelectedChannels` Explicitly selected channels. This field should be set with at least one true value when present. |