Backend & systems·Observability and operations
you commit internally to 99.9 percent of requests succeeding over 30 days, and you now have a number that says when to stop shipping features.
Service level objective
Also calledSLO
A target for an SLI over a time window. Its real function is decision-making: it converts "is reliability good enough" from an argument into arithmetic. An SLO nobody is willing to act on — by slowing releases or prioritising reliability work — is a dashboard, not an objective.