Downtime is any stretch of time a service is unreachable or returning errors for users. It is the complement of uptime — the minutes an SLA “spends.”
Downtime is expensive: lost revenue, support load, and eroded trust. You can estimate the revenue impact with our downtime cost calculator.
The goal of monitoring is to shrink both how long outages last (MTTR) and how long they go unnoticed (MTTD).
