A '''service-level objective''' ('''SLO'''), as per the O'Reilly Site Reliability Engineering book, is a "target value or range of values for a [[service level]] that is measured by an [[Service Level Indicator|SLI]]."<ref>{{cite web |latestfirst1=Beyer,Chris |last1=Jones,Proff,|first2=John |last2=Wilkes |first3=Niall |last3=Murphy |editor=Betsy Beyer |title=Site Reliability Engineering: How Google Runs Production Systems |url=https://sre.google/sre-book/service-level-objectives/ |website=Google Site Reliability Engineering |publisher=O'Reilly |access-date=9 June 2023}}</ref> An SLO is a key element of a [[Service-level agreement|service-level agreement (SLA)]] between a [[service provider]] and a [[customer]]. SLOs are agreed upon as a means of measuring the performance of the service provider and are outlined as a way of avoiding disputes between the two parties based on misunderstanding.
