Service level indicator
In information technology, a Service Level Indicator (SLI) is a measure of the service level provided by a service provider to a customer. SLIs form the basis of Service Level Objectives (SLOs), which in turn form the basis of Service Level Agreements (SLAs); an SLI is thus also called an SLA metric.
Common SLIs include latency, throughput, availability, and error rate; others include durability (in storage systems), end-to-end latency (for complex data processing systems, especially pipelines), and correctness.
- Niall Richard Murphy, Betsy Beyer, Jennifer Petoff, Chris Jones. "Service Level Terminology". Site Reliability Engineering: How Google Runs Production Systems. pp. 37–40.
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