Chapter IV: Distributed System Concerns
SLA, SLO, SLI
The agreements, objectives, and indicators that define reliability targets.
In short
SLI measures reliability, SLO is the target, and SLA is the contractual promise (with penalties).
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Key takeaways
- SLI = measurement, SLO = target, SLA = contract.
- Error budget = 100% − SLO; it balances velocity vs reliability.