docs: @Override
     public void close()
     {
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_WAIT));
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_USAGE));
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_CONNECT));
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_TIMEOUT_RATE));
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_TOTAL_CONNECTIONS));
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_IDLE_CONNECTIONS));
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_ACTIVE_CONNECTIONS));
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_PENDING_CONNECTIONS));
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_MAX_CONNECTIONS));
        registry.remove(MetricRegistry.name(poolName, METRIC_CATEGORY, METRIC_NAME_MIN_CONNECTIONS));
     }