@java.lang.Override
      public Builder clone() {
        return super.clone();
      }
<pre>
Specification to configure notifications published to Pub/Sub.
Notifications are published to the customer-provided topic using the
following `PubsubMessage.attributes`:

* `"eventType"`: one of the
[EventType][google.storagetransfer.v1.NotificationConfig.EventType] values
* `"payloadFormat"`: one of the
[PayloadFormat][google.storagetransfer.v1.NotificationConfig.PayloadFormat]
values
* `"projectId"`: the
[project_id][google.storagetransfer.v1.TransferOperation.project_id] of the
`TransferOperation`
* `"transferJobName"`: the
[transfer_job_name][google.storagetransfer.v1.TransferOperation.transfer_job_name]
of the `TransferOperation`
* `"transferOperationName"`: the
[name][google.storagetransfer.v1.TransferOperation.name] of the
`TransferOperation`

The `PubsubMessage.data` contains a
[TransferOperation][google.storagetransfer.v1.TransferOperation] resource
formatted according to the specified `PayloadFormat`.
</pre>

Protobuf type {@code google.storagetransfer.v1.NotificationConfig}
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java