Architecture & practice·Delivery, flow and technical debt
the outage started at 09:14 and traffic was healthy again at 09:31, and that number is the one that got tracked.
Mean time to restore
Also calledMTTR, time to restore service, mean time to recovery
How long it takes to restore service after a failure in production. It matters more than the failure rate for most systems, because failures are inevitable and duration is the part you can engineer: rollback speed, observability, a rehearsed on-call. Optimising for it changes design decisions, since a system that can be restored in minutes can accept risks that one requiring a four-hour restore cannot.