System Design · Middle · Question 66 of 75

How do SLI, SLO and SLA differ?

✓Correct answer: SLI is a measured indicator (e.g. success rate), SLO is the target for it, SLA is a contract with consequences if it's missed
2They're synonyms
3SLA is internal, SLO is for customers

Explanation

SLOs are usually stricter than SLAs, so teams react before contractual penalties apply.

Further reading

Google SRE Book: Service Level Objectives ↗

Test yourself

Take the System Design · Middle quiz: questions and options are shuffled, and you get a review of your mistakes at the end.