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---
id: sla
title: "SLA服务等级协议"
type: concept
tags: [sre, reliability, contract]
last_updated: 2026-04-19
---
## Definition
SLAService Level Agreement服务等级协议是客户级别的正式协议定义了服务提供者对客户的承诺。
## Key Characteristics
- **具有法律约束力**:违反可能涉及经济赔偿
- **比 SLO 更宽松**SLO 是团队内部目标SLA 是对客户的承诺
- **基于 SLO**SLA 通常基于内部 SLO 制定
## Relationship
- [[SLA服务等级协议]] ← based_on ← [[SLO服务等级目标]]
- [[SLO服务等级目标]] ← measures ← [[SLI服务等级指标]]
## Example
- SLO: 99.9% 可用性(内部目标)
- SLA: 99.5% 可用性(对客户承诺,更宽松)
## 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