SLI (Service Level Indicator) - CI/CD Glossary Definition
An SLI (service level indicator) is a quantitative measure of a service's behavior, such as the proportion of successful requests or the fraction served under a latency threshold. SLIs are the raw measurements that SLOs set targets against.
SLI vs SLO
An SLI is the measurement (for example "99.2% of requests succeeded this week"); an SLO is the target you commit to (for example "99.5% over 30 days"). The gap between them drives the error budget.
Good SLIs
Effective SLIs are measured from the user's perspective (success rate, latency, freshness) and are usually expressed as a ratio of good events to total events, which keeps them easy to alert on.
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