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The Service Level Indicator (SLI) is a key metric that measures how well a service meets specific performance objectives. It helps assess service quality and identify areas for improvement.
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A Service Level Indicator (SLI) is a measurable signal for a specific dimension of perceived service quality, such as success rate or latency.
SLIs were established in site reliability engineering as empirical measures of reliability. An SLI defines what is measured and how; an SLO sets the desired target for that measurement.
Define the user flow and measurement point precisely: which valid events form the denominator, which successful events the numerator, and which time window is used? Common SLIs cover availability, error rate, latency, and correctness. A metric name becomes a useful SLI only when it represents a service property relevant to consumers.
Defines events, numerator, denominator, time window, and aggregation.
A useful SLI measures a property that matters to service consumers.
An SLI measures; an SLO sets an internal target; an SLA contracts performance and consequences.
SLIs provide a shared, verifiable basis for reliability decisions. Without clear populations and measurement boundaries, percentages can look healthy while missing actual user experience.
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