32 lines
932 B
Markdown
32 lines
932 B
Markdown
---
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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 |