Uptime
Uptime is the percentage of time a service is available and responding correctly over a given period.
Uptime is the headline reliability metric for any website, API, or server. It is expressed as a percentage: for example 99.9%, which allows roughly 43 minutes of downtime per month. The remaining fraction is downtime.
Uptime is measured by repeatedly checking a service from one or more locations and recording whether each check succeeded. Because a single failed check can be a false alarm, robust monitoring confirms an outage from multiple locations before counting it against uptime.
Related terms
DowntimeDowntime is any period during which a service is unavailable or not responding correctly to its users.SLA (Service Level Agreement)A Service Level Agreement (SLA) is a contractual commitment to a level of service, most commonly a guaranteed uptime percentage, with consequences if it is missed.
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