Parameters to use when applying Lower Target ROAS Performance Bid Too Low recommendations.

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

| Fields ||
|---|---|
| ## `target_roas_multiplier` | `double` Required. A number less than 1.0 indicating the factor by which to decrease the target ROAS. This is a required field. |