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wiki/concepts/SLI.md
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id: sli
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title: "SLI(服务等级指标)"
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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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SLI(Service Level Indicator,服务等级指标)是可靠性的可量化度量指标,用于衡量系统健康状态。
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## Common SLIs
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- **可用性**:成功请求占总请求的比例
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- **延迟**:请求响应时间(如 P99 延迟)
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- **错误率**:失败请求占总请求的比例
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- **吞吐量**:每秒处理的请求数(QPS)
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## Usage
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SLI 被 [[SLO(服务等级目标)]] 引用,用于测量服务是否达到预期可靠性水平。
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## Relationship
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- [[SLI(服务等级指标)]] ← measures ← [[SLO(服务等级目标)]]
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- [[SLO(服务等级目标)]] ← derives ← [[Error Budget(错误预算)]]
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- [[SLA(服务等级协议)]] ← based_on ← [[SLO(服务等级目标)]]
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## References
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- [[CTP Topic 41 NFR's and Error Budgets]] — SLI/SLO/SLA 体系详解
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- [[SRE]] — 站点可靠性工程实践
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