SRE
Alerting Threshold Calculator
Enter your SLO target, measurement window, and current error rate to compute fast-burn and slow-burn alert thresholds using the Google SRE Workbook multi-window burn rate method. Outputs a Prometheus alerting rule template.
No data is transmitted — everything runs locallyTool
About this tool
Alerting Threshold Calculator
The Alerting Threshold Calculator implements the Google SRE Workbook multi-window burn rate method, computing fast-burn (14.4×) and slow-burn (6×) thresholds with Prometheus rule output.
• Set burn rate alert thresholds for a new SLO before deploying monitoring rules
• Understand whether a current error rate will trigger a page or a ticket
• Generate a Prometheus alerting rule template with correct threshold values
• Explain the multi-window burn rate method to a team adopting SLO-based alerting
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Uptime, incident, and on-call management. Better Stack provides status pages, incident management, and on-call scheduling for engineering teams.
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FAQ
What does this tool tell you?
The Alerting Threshold Calculator implements the Google SRE Workbook multi-window burn rate method, computing fast-burn (14.4×) and slow-burn (6×) thresholds with Prometheus rule output.
What affects the result most?
Multi-window burn rate calculation: fast window (1h/5min) and slow window (6h/30min). Implements Google SRE Workbook Chapter 5 alerting thresholds directly. Fast burn threshold: 14.4× burn rate triggers page (exhausts monthly budget in 2h).
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.
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