Error budget.
also: error budgetsThe unreliability an SLO allows: at 99.9% over 30 days, 43.2 minutes of bad time to spend on releases and incidents.
the two-minute refresher
- 100% − SLO = budget; 0.1% of 30 days = 43.2 minutes.
- Outages and bad deploys spend it; what remains funds risk-taking.
- Budget left: ship faster. Budget gone: freeze features and fix reliability.
- It turns reliability versus velocity into a shared, data-driven rule.