public static DropwizardMeterRegistry newRegistry(HierarchicalNameMapper nameMapper) {
        return newRegistry(new MetricRegistry(), nameMapper, Clock.SYSTEM);
    }
Returns a newly-created {@link DropwizardMeterRegistry} instance with the specified
{@link HierarchicalNameMapper}.
core/src/main/java/com/linecorp/armeria/common/metric/DropwizardMeterRegistries.java