Downtime
Downtime is any period during which a service is unavailable or not responding correctly to its users.
Downtime is the inverse of uptime. It includes hard outages (the server is unreachable) as well as soft failures — wrong HTTP status codes, content errors, or response times so slow the service is effectively unusable.
Not all downtime is equal: a planned maintenance window is expected and usually excluded from SLA calculations, while unplanned downtime counts against your reliability targets and triggers incidents.
Related terms
UptimeUptime is the percentage of time a service is available and responding correctly over a given period.IncidentAn incident is a recorded event representing a detected problem with a service, from the moment it is confirmed until it is resolved.Maintenance WindowA maintenance window is a planned time period during which work is performed on a service and alerts are suppressed.MTTR (Mean Time To Recovery)MTTR (Mean Time To Recovery) is the average time it takes to restore a service after a failure begins.
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