AI-generated Key Takeaways
- 
          The content describes a single operation on an audience, which can be either a create or an update. 
- 
          The update_maskfield is a FieldMask used to specify which resource fields are modified during an update operation.
- 
          The operationfield is a union field indicating whether the operation is a create or an update.
- 
          A create operation for an audience does not require a resource name for the new audience. 
- 
          An update operation for an audience requires the audience to have a valid resource name. 
A single operation (create, update) on an audience.
| Fields | |
|---|---|
| 
 | FieldMask that determines which resource fields are modified in an update. | 
| Union field 
 | |
| 
 | Create operation: No resource name is expected for the new audience | 
| 
 | Update operation: The audience is expected to have a valid resource name. |