How to name different kinds of alerts?

I need to distinguish two types of alert, one triggered when a value is below threshold and the other triggered when a value is higher than it. Is there different names or phrases meaning these two kinds of alerts?

For example, I receive almost ten e-mails from my co-workers every day. If someday I get nothing, it's probably because the server is down. I want to set an alert to remind myself, then how do I name it? On the other hand, when I receive over 100 e-mails, maybe our company is under attack. I also want to receive alerts, then how do I name it to make difference with the previous one?

I tried to name the first situation "Minimum Alert" or "Lower-bound Alert"; however, on second thought, these names may mean it is not possible for the actual value to fall below the set threshold. How to name or phrase them to avoid misunderstanding?

Solution 1:

Your alerts relate to various states of activity.

Activity = natural or normal function

Merriam Webster

If you apply a normal adjective to alert it is likely to be understood to apply to the alert and not to the relevant activity. This means a noun-adjective related to activity may suit your purpose better.

Your first alert stems from quiescence, which is inactivity; your second comes from over-activity.

Quiescence = the state of being temporarily quiet and not active

Cambridge

I therefore suggest the noun-adjective phrases quiescence alert and over-activity alert.