The following excerpt is from "Measure What Matters" by John Doerr. Could you please help me find out what "to keep the plumbing going" means in this context. Is it an idiomatic expression?
Note: OKRs is an abbreviation for Objectives and Key Results which is a goal-setting system.
The problem was our shared engineering team, which got caught in the middle. The engineers weren’t aligned with the product managers’ objectives. They had their own infrastructure OKRs, to keep the plumbing going and the lights on. We assumed they could do it all—a big mistake. They got confused about what they should be working on, which could change without notice...