docs: @BetaApi(
        "The surface for long-running operations is not stable yet and may change in the future.")
    public final OperationFuture<Empty, DiagnoseClusterResults> diagnoseClusterAsync(
        String projectId, String region, String clusterName) {
  
      DiagnoseClusterRequest request =
          DiagnoseClusterRequest.newBuilder()
              .setProjectId(projectId)
              .setRegion(region)
              .setClusterName(clusterName)
              .build();
      return diagnoseClusterAsync(request);
    }