Glossary
Uptime
The percentage of time a system or service is fully operational and accessible.
Uptime refers to the percentage of time a system, application, or service is operational and available to users. It is typically expressed as a percentage over a given period (e.g., 99.9% monthly uptime). High uptime is a key reliability metric for web services, APIs, and infrastructure. Uptime is the inverse of downtime — if a service has 99.9% uptime in a 30-day month, it can be down for a maximum of ~43 minutes.
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