public com.google.common.util.concurrent.ListenableFuture<
            com.google.cloud.tpu.v2.ListRuntimeVersionsResponse>
        listRuntimeVersions(com.google.cloud.tpu.v2.ListRuntimeVersionsRequest request) {
      return io.grpc.stub.ClientCalls.futureUnaryCall(
          getChannel().newCall(getListRuntimeVersionsMethod(), getCallOptions()), request);
    }
<pre>
Lists runtime versions supported by this API.
</pre>
java-tpu/grpc-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/TpuGrpc.java