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---
id: sli
title: "SLI服务等级指标"
type: concept
tags: [sre, reliability, metrics]
last_updated: 2026-04-19
---
## Definition
SLIService 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。
## Common SLIs
- **可用性**:成功请求占总请求的比例
- **延迟**:请求响应时间(如 P99 延迟)
- **错误率**:失败请求占总请求的比例
- **吞吐量**每秒处理的请求数QPS
## Usage
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。
## Relationship
- [[SLI服务等级指标]] ← measures ← [[SLO服务等级目标]]
- [[SLO服务等级目标]] ← derives ← [[Error Budget错误预算]]
- [[SLA服务等级协议]] ← based_on ← [[SLO服务等级目标]]
## References
- [[CTP Topic 41 NFR's and Error Budgets]] — SLI/SLO/SLA 体系详解
- [[SRE]] — 站点可靠性工程实践