What stopped working Were there any recent changes How does it do the thing that stopped What does that thing need in order to work normally How does that t

What stopped working Were there any recent changes How does it do the thing that stopped What does that thing need in order to work normally How does that thing tell us it’s working How do the things that it needs to work work Logs, traces, metrics to prove each; repeat —- Local repro is fine but if it’s not doing prod stuff with prod data it may not do much for you