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{{Short description|Measure of service quality}}
{{one source|date=July 2024}}
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 objective]]s (SLOs), which in turn form the basis of [[service level agreement]]s (SLAs);<ref name="sre37"/> an SLI can be called an '''SLA metric''' (also ''customer service
Though every system is different in the services provided, often common SLIs are used. Common SLIs include [[latency (engineering)|latency]], [[throughput]], [[availability]], and error rate; others include [[Durability (database systems)|durability]] (in storage systems), end-to-end latency (for complex data processing systems, especially pipelines), and correctness.<ref name="sre37">{{cite book |title=Site Reliability Engineering: How Google Runs Production Systems |author=Niall Richard Murphy |author2=Betsy Beyer |author3=Jennifer Petoff |author4=Chris Jones |section=Service Level Terminology |pages=[https://landing.google.com/sre/book/chapters/service-level-objectives.html#indicators-o8seIAcZ 37–40]}}</ref>
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