Neat: sounds like an event stream processor. I've done this in the past with temperature sensors using open source libraries like Esper (https://github.com/espertechinc/esper) and in exchange for a bit of additional complexity you can do really interesting things like convert almost natural language alert definitions into running code.

Interesting that you would bring up the concept of almost natural language. Barrage is actually built on top of Avail which is sincerely the most expressive language I've ever seen. Check it out: https://www.availlang.org/

This is very interesting but does raise the question of how to adequately define patterns. One would have to have a working understanding of the type of events that need alerts, and how they look on a sensor, as well as what type of false alarm could look the same. But it is a definite step up from threshold-based alerting, which is hugely susceptible to false alarms.

Using the patterns on their own is a bit of an iterative process, but I'm sure you can imagine how it's a substrate on which all kinds of interesting automation of pattern learning could be built.