OK. But how does that relate to this article? If you're using keepalived what you're doing is moving the connection from one instance to another if the current one is detected as being dead. Even if only the MAC was used to generate the UUID (which it is not, timestamp is factored in too) I struggle to find a scenario in which this would be a problem. Even if you time it down to the nanosecond, if keepalived is used as intended you'd never generate a UUID at the same time on a number of machines sharing the MAC.

And from a privacy concern, if the MAC cannot be considered unique, that's only a bonus?