Production Observability

"If you can't see what's failing, you can't fix it."

Philosophy

Code fails in production in ways it never fails in your editor. Silent failures are worse than loud failures. Every error, retry, and state transition should leave a trace.

The Minimal Stack

Error context — when an error happens, log the context that led to it:

// ✗ Silent failure
const result = await fetchUser(userId);
if (!result.ok) return null; // Where? Why? What ID?