The result for the experiment arm mutate.

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

| Fields ||
|---|---|
| ## `experiment_arm` | `https://developers.google.com/google-ads/api/reference/rpc/v26/ExperimentArm` The mutated experiment arm with only mutable fields after mutate. The field will only be returned when response_content_type is set to "MUTABLE_RESOURCE". |
| ## `resource_name` | `string` Returned for successful operations. |