Complex Boolean operators on alert conditions

My previous answer assumed OR conditions (if hit thresholdA OR thresholdB). If you want to do a AND like condition, which as I re-read the question, might be what you are asking, that may depend on the situation.

Here I'm assuming you want to basically consider any Certs that have daystoexpire < -100 to just be ignored in all cases, in other words anything under -100 is invalid. So you can edit the "Valid value range" for daystoexpire  to be "-100 to blank". That way you will just get a NaN if it's less then -100, and still have an easily changed main thresholds of < 30.