In Site Reliability Engineering (SRE) practice, a team agrees on a 99.9% monthly availability SLO for a user-facing service. Which concept describes the allowed 0.1% unavailability that the team can consume for changes or incidents?
Mean Time to Repair (MTTR)
Service Level Agreement (SLA)
Error budget
Toil quota
In SRE, the gap between the SLO target and 100% reliability is called the error budget. It represents the total allowable time the service can be unavailable without violating the SLO, letting teams balance velocity and stability when deploying changes. MTTR measures how quickly failures are fixed, not how much downtime is tolerated. An SLA is a contractual commitment to customers and often differs from the internal SLO. "Toil quota" is not a standard SRE term.
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