public Meter meter(String name) {
        return getOrAdd(name, MetricBuilder.METERS);
    }
@Test
    public void accessingAMeterRegistersAndReusesIt() {
        final Meter meter1 = registry.meter("thing");
        final Meter meter2 = registry.meter("thing");

        assertThat(meter1)
                .isSameAs(meter2);

        verify(listener).onMeterAdded("thing", meter1);
    }