Glossary term
What is Error budget? Meaning for developers
In System Design
Allowed failure = 100% − SLO. Example: 99.9% SLO on 10M requests → 10,000 failures allowed.
Learn it properly · System DesignLesson 47: SLI, SLO, SLA & Error BudgetsProduct wants to ship daily; operations wants fewer changes; nobody agrees what “reliable enough” means. SLIs, SLOs and SLAs turn it into one number, and error budgets turn that number into a simple rule for when to move fast and when to slow down.In Observability & SRE
The amount of failure an SLO allows, which is 100 percent minus the target.
Learn it properly · Observability & SRELesson 4: SLIs, SLOs and Error BudgetsChoosing indicators, setting objectives, how nines translate to minutes, burn rates and what error budgets are for.