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An error budget is computed from an SLO. If an SLO is 99.9% success over 30 days, the error budget for the period is approximately:
A0.1% (≈ 43 minutes of downtime / failure budget)
B0% (zero failures allowed)
C100% (no constraints)
D10% (≈ 3 days of failure budget)
Answer & Solution
Correct answer: A. 0.1% (≈ 43 minutes of downtime / failure budget)
Error budget = 1 − SLO. At 99.9%, that's 0.1%, which is roughly 43.2 minutes per 30 days. The other options describe wildly looser or stricter targets.
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