Discrete thresholds

[velik97]

Hello!

In some cases it would be very convenient to have discrete thresholds.
For instance, I record some values, produced by my algorithm, depending on realtime data. If the returned value is +Infinity, -Infinity, 0.0 or NaN, I can say, that something gone wrong and I want to highlight it with red color. In any other casу would use green. I can do It with help of rules in Prometheus, but still it would be a nice feature!

Thanks!