Resilience management - Measure
Uptime
The proportion of time a service is running and available for use
What's it for?
Helps teams measure whether a service is available as often as users expect.
For example…
The intranet reports 99.9% uptime last quarter — roughly a few hours of unplanned downtime in three months
A service with 99.9% uptime can still be unavailable for several hours across a year, which is why small percentage differences matter
Think of it like…
Shop opening hours kept versus unexpected closures