SLO burn-rate example: comparing one hour and five minutes

Explore a two-window burn-rate checkpoint using a 99.9% SLO and illustrative event counts.

Illustrative dataset · Tool version 2 · Reviewed September 29, 2026

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Is the higher error rate visible in both windows?

Both illustrative windows have 1.5% bad events against a 0.1% allowed fraction, producing 15× burn. The long window has 1,500 bad events out of 100,000 over one hour; the short window has 150 out of 10,000 over five minutes. Both exceed the example 14.4× checkpoint. Over a 30-day period, the long window represents about 2.08% normalized budget spend.

WindowBurn rate
One hour15×
Five minutes15×

What this example does not establish

Windows must end together and use the same SLI. This demonstrates threshold arithmetic, not a deployed alert or measured remaining rolling budget. Variable traffic changes the interpretation of normalized spend.

Try a variation

Open the example, change one input, and review the result. Keep definitions and denominators constant when comparing scenarios. Save a named draft before changing to a different dataset.

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