MetricUtil { public static Set<String> defaultVTags() { return new HashSet<>(); }  static Map<String, String> defaultKvTags(); static Set<String> defaultVTags(); static MetricDefinition metricDefinition(); static MetricDefinition metricDefinition(Map<String, String> kvTags, Set<String> vTags); static MetricData metricData(MetricDefinition metricDef); static MetricData metricData(MetricDefinition metricDef, double value); static MetricData metricData(MetricDefinition metricDef, double value, long epochSecond); static String getDataRetrievalValue(MappedMetricData mappedMetricData, String dataRetrievalTagKey);  }
@Test public void testDefaultVTags() { assertTrue(MetricUtil.defaultVTags().isEmpty()); }