@Test
public void testNamingCamelCase() {

  PrometheusMetricsSink sink = new PrometheusMetricsSink();
  Assert.assertEquals("rpc_time_some_metrics",
      sink.prometheusName("RpcTime", "SomeMetrics"));
  Assert.assertEquals("om_rpc_time_om_info_keys",
      sink.prometheusName("OMRpcTime", "OMInfoKeys"));
  Assert.assertEquals("rpc_time_small",
      sink.prometheusName("RpcTime", "small"));
}