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---
id: slo
title: "SLO服务等级目标"
type: concept
tags: [sre, reliability, metrics]
last_updated: 2026-04-19
---
## Definition
SLOService 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。
## Common SLOs
- **可用性目标**99.9%三个九、99.99%(四个九)
- **延迟目标**P99 响应时间 < 200ms
- **错误目标**:错误率 < 0.1%
## Relationship with Error Budget
SLO 与 Error Budget 直接关联:
```
Error Budget = 1 - 可用性 SLO
```
例如99.9% SLO → 0.1% Error Budget
## Hierarchy
- [[SLI服务等级指标]] → measures → SLO
- SLO → derives → [[Error Budget错误预算]]
- SLO → satisfies → [[SLA服务等级协议]]
## References
- [[CTP Topic 41 NFR's and Error Budgets]] — SLO 与 Error Budget 关系详解
- [[SRE]] — 站点可靠性工程实践