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wiki/concepts/SLO.md
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id: slo
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title: "SLO(服务等级目标)"
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type: concept
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tags: [sre, reliability, metrics]
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last_updated: 2026-04-19
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---
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## Definition
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SLO(Service Level Objective,服务等级目标)定义了服务应该达到的性能/可靠性目标,是团队努力实现的具体指标。
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## Common SLOs
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- **可用性目标**:99.9%(三个九)、99.99%(四个九)
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- **延迟目标**:P99 响应时间 < 200ms
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- **错误目标**:错误率 < 0.1%
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## Relationship with Error Budget
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SLO 与 Error Budget 直接关联:
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```
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Error Budget = 1 - 可用性 SLO
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```
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例如:99.9% SLO → 0.1% Error Budget
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## Hierarchy
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- [[SLI(服务等级指标)]] → measures → SLO
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- SLO → derives → [[Error Budget(错误预算)]]
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- SLO → satisfies → [[SLA(服务等级协议)]]
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## References
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- [[CTP Topic 41 NFR's and Error Budgets]] — SLO 与 Error Budget 关系详解
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- [[SRE]] — 站点可靠性工程实践
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