From my business life I'm looking at the MRR of my project https://topstonks.com, our site traffic, etc.
From my personal life -
I guess stepping on the scale in the mornings, haha. That's a depressing one to watch. There are the obvious personal finance metrics as well.
Also keeping an eye on inflation... maybe Covid infection numbers as well since those seem to be in the news alot. It's kind of hard not to see those numbers lately.