MTTR
Mean Time To Repair / Mean Time To Recovery
Mean Time To Repair/Recovery - the average time to restore service after a failure.
Definition
Mean Time To Repair (or Recovery) is a key reliability metric that measures the average time taken to restore a system to operational status after a failure. MTTR starts when a failure is detected and ends when normal service is restored. A lower MTTR indicates more efficient incident response and recovery processes. MTTR is one of the four key DevOps metrics (alongside deployment frequency, lead time, and change failure rate) used to measure software delivery performance.
Examples
MTTR Calculation
How to calculate MTTR from incident data.
// MTTR Calculation Example
const incidents = [
{ duration: 45 }, // 45 minutes
{ duration: 30 }, // 30 minutes
{ duration: 60 }, // 60 minutes
{ duration: 15 }, // 15 minutes
];
const totalDowntime = incidents.reduce((sum, i) => sum + i.duration, 0);
const mttr = totalDowntime / incidents.length;
// MTTR = 150 / 4 = 37.5 minutesUse Cases
Best Practices
- Automate detection to reduce time-to-detect
- Maintain runbooks for common failure scenarios
- Practice incident response through game days
- Implement automated recovery where possible
- Track MTTR trends over time to measure improvement
FAQ
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