What is a Service Level Objectives (SLO) an what it means for performance testing

A service level objective (SLO) is a measurable reliability target for a service over a specific time window—like "99.9% of requests complete in under 200ms over 30 days." SLOs turn vague notions of "good performance" into concrete numbers that engineering teams can track, test against, and use to make release decisions. This guide covers how SLOs relate to SLIs and SLAs, how to define effective targets for your applications, and how to validate SLO compliance through load testing before perform