# Service level indicator

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Measure of service quality

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In [information technology](/source/Information_technology), a **service level indicator** (**SLI**) is a measure of the [service level](/source/Service_level) provided by a [service provider](/source/Service_provider) to a customer. SLIs form the basis of [service level objectives](/source/Service_level_objective) (SLOs), which in turn form the basis of [service level agreements](/source/Service_level_agreement) (SLAs);[1] an SLI can also be called an **SLA metric** (also *customer service metric*, or simply *service metric*).

Though every system is different in the services provided, often common SLIs are used. Common SLIs include [latency](/source/Latency_(engineering)), [throughput](/source/Throughput), [availability](/source/Availability), and error rate; [2] others include [durability](/source/Durability_(database_systems)) (in storage systems), end-to-end latency (for complex data processing systems, especially pipelines), and correctness.[1]

## References

1. ^ [***a***](#cite_ref-sre37_1-0) [***b***](#cite_ref-sre37_1-1) Niall Richard Murphy; Betsy Beyer; Jennifer Petoff; Chris Jones. "Service Level Terminology". *Site Reliability Engineering: How Google Runs Production Systems*. pp. [37–40](https://landing.google.com/sre/book/chapters/service-level-objectives.html#indicators-o8seIAcZ).

1. **[^](#cite_ref-2)** ["SLOs, SLIs, and SLAs: Understanding Key Service Metrics"](https://last9.io/blog/guide-to-service-level-indicators-and-setting-service-level-objectives/). *Last9*. Retrieved 2026-01-18.

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