In many companies, engineering puts out fires, prevents disasters, gets rid of tech debt, etc. In short, engineering does a lot of maintenance that is needed to keep the entire company afloat. If that work stops, the company will go bust.

It's such an obvious key objective, it should be in every top-level OKR, yet it almost never is, which means that there's nowhere the engineering department can slot in that work. And how do you measure it?