docs: void logPoolState(String... prefix)
     {
        if (logger.isDebugEnabled()) {
           logger.debug("{} - {}stats (total={}, active={}, idle={}, waiting={})",
                        poolName, (prefix.length > 0 ? prefix[0] : ""),
                        getTotalConnections(), getActiveConnections(), getIdleConnections(), getThreadsAwaitingConnection());
        }
     }