The bug you don't know about is the one costing you customers

AI writes features on command. It never writes observability unless you ask — so most vibe-coded apps run with no idea what's actually happening inside them.

Something breaks overnight, and you find out because a user emails you. You don't know what broke, when, or how many people it hit, because there are no request logs, no error tracking, no performance metrics, no audit trail. Debugging becomes archaeology: read the code, guess what happened, deploy a fix, and hope. That's not engineering — it's a coin-flip you keep losing.

One agency that inherited a vibe-coded app three months into production got told by the founder it was "mostly working." Their first week of real logging told a different story: silent errors on 14% of all requests, a third-party API timing out three times a day with no notification, and one endpoint taking 18 seconds to respond while users just sat there. None of it was visible for three months — because nothing was watching.

Two checks from this doctrine

Real value, not a teaser — two of the 4 checks in full. The rest are in the one-pager.

If you can't see what your app is doing, you can't fix what it's doing — logging isn't overhead, it's how you find out before your users do.