Glossary term
What is MTTR (Mean Time To Recovery (or Repair))?
MTTR stands for Mean Time To Recovery (or Repair).
In System Design
Average time to recover from a failure. Example: Rollback in 5 minutes instead of 4 hours.
Learn it properly · System DesignLesson 9: Availability and "The Nines" Explained“Five nines” is 26 seconds of downtime a month. What the nines really mean, why chained dependencies multiply away your availability while redundancy multiplies it back, and why fast recovery is often the cheapest nine you can buy.In Observability & SRE
The average time to detect, acknowledge, mitigate or recover from incidents, and an average can hide a few very long ones.
Learn it properly · Observability & SRELesson 6: Incidents, On-Call and Blameless Post-MortemsIncident roles and the first hour, communication, on-call habits, writing a blameless post-mortem with a full example.