How do error budgets guide release decisions in site reliability engineering?

Example Concept: An error budget is defined as the difference between 100% availability and the agreed-upon Service Level Objective (SLO). For instance, if the SLO is 99.9% uptime, the error budget is 0.1%. This budget guides release decisions by allowing teams to push new features as long as the error budget isn't exhausted. If the error budget is depleted, the focus shifts to improving reliability rather than deploying new features, ensuring that service quality remains within acceptable limits.