%% date:: [[2022-10-21]] %% # [[SLAs vs SLOs vs SLIs]] [[Service Level Agreement (SLA)|SLA]]s, [[Service Level Objective (SLO)|SLO]]s, and SLIs are sometimes used interchangeably, but they differ in the level that they are applied. ## SLAs SLAs (Service Level Agreements) consist of (often) contractual promises about the reliability of an application made by the company to customers. [[Service Level Agreement (SLA)|SLAs]] are the highest level. They are agreements between a company and its customers and are legally binding. ## SLOs [[SLOs]] are _internal_ goals that a company has about the reliability of their app or services. SLOs (Service Level Objectives) reflect the ideal state of an application, but they are usually internally defined. ## SLIs SLIs (Service Level Indicators) reflect the _current_ state of an application, as measured by predefined system metrics. They are not test criteria because they say nothing about what the values _should_ be. [[Service Level Indicator (SLI)]] are not criteria at all, but current values of metrics that a company measures to help them understand the stability, reliability, and performance of their systems.