This is a simple addon that is designed to warn you if you are about to lose your connection to the server. Note that this is not a magic addon, and can not predict the future, so it will only detect ~5 seconds loss of connectivity. This should still provide you with a heads up.
The addon is primarily designed for people with shaky connections in mind, but should still provide useful latency information for the rest. (See below)
It also provides a very fast updated Round-Trip Time (latency) display, in a dragable frame.
Thanks to kneeki for providing the base code.
Feel free to make suggestions on how to improve this addon in the comments below.