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Availability is a crucial concept in IT, referring to the reliability and accessibility of systems. High availability is essential for mission-critical applications, as it minimizes downtime and ensures user satisfaction.
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Availability describes how often a service is usable for its intended purpose during the agreed period.
Availability comes from reliability engineering and IT service management. Site reliability engineering made it actionable through user-centered indicators, objectives, and error budgets.
A service defines a successful user signal and measures it over time. Redundancy, fault isolation, failover, and recovery influence the measured proportion.
The central idea and its purpose.
The essential building blocks work together.
Application depends on context and protection needs.
Availability connects technical resilience with business impact. Dependencies, partial failures, maintenance, and data correctness belong in the measurement definition.
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