SLI (Service Level Indicator)
An SLI is the measurement behind an SLO. Why a ratio of good to valid events is a useful form, where to measure it, and which indicators suit each system.
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SLA (Service Level Agreement)
An SLA attaches consequences to a service level. See how it relates to SLOs and SLIs, which clauses decide what it promises, and what credits do not cover.
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SLO (Service Level Objective)
An SLO is a target for how reliable a service must be over a window. See what it must specify, how error budgets turn it into decisions, and how to set one.