[20220813] SLI、SLO、SLA とは

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参考

• https://www.cloudskillsboost.google/course_sessions/1375344/video/268070
• https://www.atlassian.com/ja/incident-management/kpis/sla-vs-slo-vs-sli

SLI

Service level indicators, or SLIs, are carefully selected monitoring metrics that measure one aspect of a service's reliability.

SLO

A Service level objective, or SLO, combines a service level indicator with a target reliability. If you express your SLIs as is commonly recommended, your SLOs will generally be somewhere just short of 100%, for example, 99.9%, or "three nines."

SLA

And then there are Service Level Agreements, or SLAs, which are commitments made to your customers that your systems and applications will have only a certain amount of down time.

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