Service Level Indicator

An SLI (service level indicator) measures compliance with an SLO ([service-level-objective]). So, for example, if your [service-level-agreement] specifies that your systems will be available 99.95% of the time, your SLO is likely 99.95% uptime and your SLI is the actual measurement of your uptime. Maybe it’s 99.96%. Maybe 99.99%. To stay in compliance with your SLA, the SLI will need to meet or exceed the promises made in that document.

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