Mean time to recovery (MTTR) is the average time it takes to restore a service after a failure or incident begins. It shows how quickly a team detects, responds to and fixes problems.
Observability is the ability to understand what a running system is doing, and why, from the data it emits. That data is mainly logs, metrics and traces, which let engineers answer new questions without shipping new code.
An on-call rotation is a schedule that assigns engineers, in turn, to respond to production alerts and incidents outside or during normal hours. Someone is always available to restore service.
A rollback is the act of returning a system to a previous known-good version after a release causes problems. It restores service quickly while the team investigates the cause.
An incident postmortem is a written review held after an outage or serious failure. It records what happened, why it happened and how the response went, then commits to specific changes that make a repeat less likely.
Incident response is the planned process an organisation follows to detect, contain, investigate and recover from a security incident. It ends with lessons that strengthen defences.
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