metrics = collection_registry->CollectMetrics(options);
  EXPECT_EQ(6.0, metrics->point_set_map.at("test/sampler")
                     ->points.at(0)
                     ->histogram_value.sum());
  TFE_MonitoringDeleteBuckets(buckets);
  TFE_MonitoringDeleteSampler0(sampler);
  TF_DeleteStatus(status);
}

TEST(CAPI, MonitoringMultipleSampler) {
  TF_Status* status = TF_NewStatus();

    return tensorflow::monitoring::Buckets::Exponential(scale, growth_factor,
                                                        bucket_count);
  });
}

void TFE_MonitoringDeleteBuckets(TFE_MonitoringBuckets* buckets) {
  delete buckets;
}

TFE_MonitoringSampler0* TFE_MonitoringNewSampler0(
    const char* name, TFE_MonitoringBuckets* buckets, TF_Status* status,

TF_CAPI_EXPORT extern TFE_MonitoringBuckets*
TFE_MonitoringNewExponentialBuckets(double scale, double growth_factor,
                                    int bucket_count);
TF_CAPI_EXPORT extern void TFE_MonitoringDeleteBuckets(
    TFE_MonitoringBuckets* buckets);

// APIs for Sampler without label.
typedef struct TFE_MonitoringSampler0 TFE_MonitoringSampler0;
TF_CAPI_EXPORT extern TFE_MonitoringSampler0* TFE_MonitoringNewSampler0(