Exercise 2: "Nothing in the Logs" Isn't Proof of Nothing Wrong — Possible Solution
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WHAT A "SILENT FAILURE" ACTUALLY IS
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Per this chapter, a log is "a recording of everything someone CHOSE to
record" - not a complete recording of everything that actually
happened. A silent failure is a failure case nobody wrote a log line
for. Per this chapter directly: "If nobody wrote a log line for a
particular failure case, it simply won't appear."

WHY "NOTHING IN THE LOGS" DOESN'T MEAN "NOTHING WENT WRONG"
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Per this chapter, "the absence of an error in the logs is not proof
nothing went wrong" - stated explicitly as one of the honest limits of
logging. Since logging only captures what a developer or system
designer thought to record, a real failure can occur in a code path
that was simply never instrumented with a log statement, and it will
leave no trace at all, regardless of how real or serious the failure was.

WHY THE COLLEAGUE'S CONCLUSION IS UNSAFE
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Per this chapter, treating "no logs" as equivalent to "nothing
happened" confuses the log record with reality itself, when the log
record is only ever a partial, deliberately-chosen subset of reality.
The correct response to "nothing in the logs" is closer to "nothing
was recorded" - which leaves genuine failure still a real possibility
that other evidence needs to be checked for.

WHY THIS WORKS AS AN ANSWER
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It correctly defines a silent failure using this chapter's own
language, and correctly explains why an absence of logged errors
cannot be treated as proof of an absence of real errors.