Mean-time-to-recovery (MTTR) is a reliability metric that quantifies the average elapsed time from the moment a service failure is detected until the service is fully restored to normal operation. Parameters: (1) the failure detection timestamp as the start point, (2) the full-service-restoration timestamp as the end point, (3) aggregation over a defined period and incident set to compute the mean. The metric persists through documentation in incident reports, service-level reviews, and SRE playbooks — a textual convention maintained by operational practice. [formal: tempus-recuperationis-media | substrate: mind | horizon: hours | explicit: yes | epoch: 0.01]
Accepted ontology entry
mean-time-to-recovery
Mean-time-to-recovery (MTTR) is a reliability metric that quantifies the average elapsed time from the moment a service failure is detected until the service is fully restored to normal operation. Parameters: (1) the failure detection time…
Definition
Why it is in scope
A human-made reliability metric that measures the average time elapsed from the detection of a service failure to the restoration of full service operation. It is a quantitative convention used in incident management and SRE practice to benchmark and improve response efficiency.
Names and aliases
- mean-time-to-recoveryen · CANONICAL
Relations from this entry
- cmrwiv1rn00a8soacg5vdpiogINSTANCE_OF →
MTTR is a specific kind of metric. The competent-speaker test passes: 'MTTR is a metric.' No intermediate category between MTTR and metric — it directly measures the average time to recover from failures. Nearest kind is metric.
- cmr9uz3vv00elhcxfruyltnd4INSTANCE_OF →
MTTR is a specific kind of measurement: it measures the time to restore service after a failure. Per Law 9, a competent speaker would call MTTR 'a measurement'. Nearest kind is measurement — no intermediate rung between MTTR and measurement.
- cms7wyk72004ph6s8d82lhwqlSERVES →
MTTR is maintained for the sake of reliability: it measures restoration speed so teams can track and improve reliability performance. Servant (MTTR) points at master (reliability).
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Aug 7, 2026, 10:16 AM UTC
- Content hash
- e77cad6188ba37f634e5a7897444bd01e28d4ed63a29ef449a844fe0218380ad