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Glossary

SLA

Service level agreement: a contract with users that includes consequences for meeting or missing the SLOs it contains.

SLO
Service level objective: a target value or range for an SLI, such as 99.9% of requests succeeding over 30 days.
Uptime
The share of time a service is available

Sources

Google SRE book, ch. 4: Service Level Objectives

Updated October 22, 2026.

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