public static String name(Class<?> clazz, String... parts) {
    return name(clazz.getSimpleName(), parts);
  }
@Test
  void name() {

    assertEquals("chat.MetricsUtilTest.metric", MetricsUtil.name(MetricsUtilTest.class, "metric"));
    assertEquals("chat.MetricsUtilTest.namespace.metric",
        MetricsUtil.name(MetricsUtilTest.class, "namespace", "metric"));
  }