@Override
  public void reset() {
    countersMap.computeIfPresent(
        metricName,
        (unusedName, value) -> {
          value.set(0);
          return value;
        });
  }
@Test
  public void testRemoveSafeDeltaCounterCell_resetNonExistant() throws Exception {
    ConcurrentHashMap<MetricName, AtomicLong> metric_map = new ConcurrentHashMap<>();
    MetricName metric1 = MetricName.named("namespace", "name_1");

    RemoveSafeDeltaCounterCell cell_1 = new RemoveSafeDeltaCounterCell(metric1, metric_map);
    assertThat(metric_map.size(), equalTo(0));

    cell_1.reset();
    assertThat(metric_map.size(), equalTo(0));
  }