What is Uptime?
Turkish: Uptime
Uptime expresses how long a system remains accessible outside planned or unplanned outages, usually as a percentage or time window.
What is Uptime?
Uptime shows how long a website, API, database, or infrastructure component remains available. It is usually expressed as a percentage: 99% uptime means about 7 hours of downtime per month, 99.9% means about 43 minutes, and 99.99% means about 4 minutes.
How Is It Measured?
Measurement depends on which endpoint is checked, how often it is checked, and from which regions. The homepage may respond while the payment API or admin panel is unavailable, so the business impact is different. Uptime is therefore often monitored through critical user journeys.
Whether planned maintenance is included depends on the contract. A service may also look “up” while being too slow or returning frequent errors, which means real availability is lower.
Business Use
Uptime tracking is used for customer contracts, on-call operations, status pages, and post-incident reports. An SLA should clearly define the target percentage, measurement method, exclusions, and compensation terms.
High uptime requires monitoring, redundancy, automatic failover, regular backup testing, and an incident response process.
Related Terms
Disaster recovery restores systems after outages or data loss within target RTO and RPO limits through tested plans.
SLA (Service Level Agreement)An SLA defines uptime, response time, resolution targets, measurement methods, and remedies between a provider and a customer.
SLI and SLOSLIs and SLOs define measurable service signals and the reliability targets teams commit to for those signals over time.