void increaseConnClosed(SessionProtocol protocol, InetSocketAddress remoteAddr,
                            InetSocketAddress localAddr) {

        final List<Tag> commonTags = commonTags(protocol, remoteAddr, localAddr);
        lock.lock();
        try {
            final Meters meters = metersMap.get(commonTags);
            if (meters != null) {
                meters.decrement();
                assert meters.activeConnections() >= 0 : "active connections should not be negative. " + meters;
            }
        } finally {
            lock.unlock();
        }
    }
Creates a new instance with the specified {@link Meter} name.
core/src/main/java/com/linecorp/armeria/client/ConnectionPoolMetrics.java