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An error report showing the chain of function calls that led to a crash.
Stack traces point developers to where a failure happened. They are especially useful when paired with the exact command, route, input, and recent diff.
Plainly
Think of Stack Trace as the checklist that keeps the app open for real people. An error report showing the chain of function calls that led to a crash.
In practice
Use it when a change has to survive deploys, users, incidents, analytics, or billing reality. In practice, define the owner, input, output, and failure mode before you rely on it.