Inactivity Monitor.... What is that?

I ran into this by accident. I was looking at a Priority 1 incident and couldn't understand why it had an updated date when no one had done anything. It turned out it might be the work of the inactivity monitor...

Fire an email notification from a schedule job

This question popped up in the community and I thought I might as well put the answer here as well. Question was how you could check if the valid to date is 30 days from now and then send a notification to the KB managers.