Probably not a huge priority, but while investigating a memory leak somewhere in winston, I noticed the getServer code using a clever way of load balancing between configured servers.
CallCount is never reset though, so once the count reaches 9007199254740992, callCount++ will stop incrementing, thus breaking load balancing.
https://github.com/Wizcorp/node-graylog2/blob/master/graylog.js#L49