SLOs, SLAs, and SLIs

Service Level Objective (SLO): Objectives you set for your service. There are usually multiple SLOs that you track; some may relate directly to your SLA, while others may be internal goals (to provide a margin of error or better service).

Example: “99.9% uptime.”

Service Level Agreement (SLA): The agreement you make with your customers or users about the level of service you will provide. This is usually based on your SLOs.

Example: “We will provide 99.9% uptime.”

Service Level Indicator (SLI): The metrics you use to measure your progress.

Example: “Our uptime for the last 30 days was 99.8%.”