Service Level Objectives

Core idea

SLOs define the target reliability users should experience, not just the raw uptime a system might achieve.

Revision points

• SLIs are measurements.
• SLOs are targets.
• Error budgets create room for balancing delivery speed with reliability.

SLI: 99.92% of API requests return under 300ms
SLO: Maintain that performance over a rolling 30-day window

What to remember

If the metric does not connect to user experience, it is probably the wrong reliability target.