Error Budgets

Error budgets connect quality to business consequences such as SLA violations and penalties. Error budgets turn speed-versus-stability debates into objective operating rules. Error budgets give engineering and business stakeholders a shared language for quality. Error budgets help translate technical risk into business impact for stakeholders. An error budget defines how much downtime or unreliability the organization can tolerate. At a 99.9% SLO, the error budget is about 43 minutes of downtime per month. A service-level target such as 99.9% uptime can define an acceptable reliability threshold. Feature shipping should stop when the system exceeds its error budget or breaks beyond the agreed threshold. An error budget functions as a mathematical circuit breaker that shifts attention to system health when reliability deteriorates. When the error budget is exhausted, stability must take priority over more features. Reliability rules should stop product pressure from forcing feature work onto failing systems. Teams should continue shipping while error budget remains and stop to fix reliability when it is burned. Feature delivery may continue while the system remains within its error…