Service level indicator (SLI)
An SLI is a clearly defined measure of an aspect of service quality that matters to users.
A service level indicator, or SLI, is a clearly defined measure of an aspect of service quality. It may concern successful requests, response time or correctness. Numerator, denominator and measurement period must be explicit.
A fictional search measures valid requests receiving a correct answer within 2 seconds. During a calendar month, 990 of 1,000 requests meet this definition: the SLI is 99%. These are illustrative calculations, not measured ASES performance.
The SLI describes the measured result. Its SLO sets the target value. A server-side measure may only approximate the quality users experience, so the measurement point belongs in the definition too.
Sources
Related terms
- Service level objective (SLO)An SLO sets a target for a defined service-quality measure over a stated period.
- Audit logAn audit log makes important application events traceable. Actor, action, affected object and outcome need to be readable together.
- MonitoringMonitoring continuously collects and evaluates selected system states and functions. What it tells you depends on what is actually observed.
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