SLI / SLO / SLA
Observability & reliability
SLI / SLO / SLA
An SLI measures service behaviour that users notice, such as latency or error rate. An SLO sets a target for that SLI. An SLA is a contract that states the consequences when a provider misses its commitments, so set SLOs tighter than SLAs.
Resources
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Implementing Service Level ObjectivesBook · Alex Hidalgo · Amazon affiliate link, opens Amazon in a new tabSRE workbook: implementing SLOsBook · Google · opens in a new tabSite Reliability Engineering (the Google SRE book)Book · Betsy Beyer, Chris Jones, Jennifer Petoff, Niall Richard Murphy · Amazon affiliate link, opens Amazon in a new tabcharity.wtfBlog · Charity Majors · opens in a new tabObservability EngineeringBook · Charity Majors, Liz Fong-Jones, George Miranda · Amazon affiliate link, opens Amazon in a new tab