One Saturday morning I was fixing my coffee grinder while watching James Hoffmann explain how a PID controller works in an espresso machine — using a ship navigation system as the example. Something clicked. When I'm not brewing coffee, part of my day job is writing Kubernetes operators. And somewhere between the proportional term and the integral term, I realized I'm facing the same problems the best engineering minds started tackling in the 18th century. It wouldn't have been such a surprise if I'd paid more attention in my final years at university. But we are where we are. The Kubernetes reconcile loop is a feedback control loop. You declare a desired state (the setpoint), the system continuously observes actual state (the process variable), computes the difference (the error), and takes corrective action (actuation). This is the same pattern that's been studied since James Watt put a centrifugal governor on a steam engine.…