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Error budget.

also: error budgets

The 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.

Where the course teaches it

W10 · Day 1SLIs, SLOs and SLAslearn it →W10 · Day 1SLIs, SLOs and SLAsrevisit →W00 · Part 6System Design Terminology & Theoryrevisit →

Related concepts

SLO
Burn rate