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Equation #24 · Chapter 12

Trust/Risk Ratio T_r

Tr=Volumetraffic×TimeuptimeSeverityincidentsT_r = \frac{Volume_{traffic} \times Time_{uptime}}{Severity_{incidents}}

Trust/Risk Ratio

T_r · Ch 12

(Traffic volume × uptime) ÷ incident severity. Run silent until the math is undeniable, then push the alert.

Worked example — Running silent in one department

Four months live with a single team: 200,000 requests a day, 120 days of uptime, and two brief incidents you'd score at 5 severity between them.

It came out at 4,800. Yellow — not yet.

Hold the same severity to 260 days and it reads 10,400: green, ready to be somebody's primary. Then push the alert. You only get to make the argument that turning you off is the dangerous move once, so wait until the arithmetic is boring.

Your turn — change one number
Result4,800

Yellow. Keep running silent. The math isn't undeniable yet.