Exercise 2: The Four Scoping Questions — Possible Solution
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THE FOUR QUESTIONS, PER THIS CHAPTER
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1. One machine, or many?
2. One resource elevated, or several at once?
3. Sudden onset, or a gradual drift?
4. Does it line up with a known event?

QUESTION 1 — ONE MACHINE, OR MANY?
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Per this chapter, "one machine points at something local to it; many
machines at once points at something shared - a network dependency, a
database, or a common upstream cause."

QUESTION 2 — ONE RESOURCE, OR SEVERAL AT ONCE?
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Per this chapter, several resources moving together is itself a clue -
"heavy disk I/O can starve the CPU of work to do while it waits, which
shows up as elevated CPU 'wait' time rather than a genuine CPU
bottleneck." A single elevated resource points more directly at that
resource specifically; several moving together can mean one is
actually causing the other's symptom.

QUESTION 3 — SUDDEN, OR GRADUAL?
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Per this chapter, "a sudden change points toward a specific triggering
event - a deployment, a cron job, a traffic spike; a slow drift over
days or weeks points toward a genuine capacity or leak problem."

QUESTION 4 — TIED TO A KNOWN EVENT?
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Per this chapter, "a deployment, a scheduled job, or a marketing
campaign happening at the same time is often the actual explanation,
hiding in plain sight."

WHY THIS WORKS AS AN ANSWER
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It reproduces all four questions accurately and explains, for each
one, what a specific answer points the investigation toward, using the
chapter's own stated reasoning rather than just listing the questions
without their purpose.