public static Builder newBuilder(com.google.cloud.tpu.v2.ListRuntimeVersionsRequest prototype) {
    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
  }
<pre>
Sort results.
</pre>

<code>string order_by = 6;</code>

@return The bytes for orderBy.
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/ListRuntimeVersionsRequest.java