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SLI.

also: SLIs · service level indicator · service level indicators

Service level indicator: a measured number describing service behaviour, such as the share of requests served successfully under 200 ms.

the two-minute refresher

SLI = the measurement; SLO = the target; SLA = the promise with consequences.
Usually good events ÷ valid events: availability, latency, correctness, freshness.
Measure what users feel, as close to them as possible.

Where the course teaches it

W10 · Day 1SLIs, SLOs and SLAslearn it →W10 · Day 1SLIs, SLOs and SLAsrevisit →W00 · Part 6System Design Terminology & Theoryrevisit →

Related concepts

SLO
SLA
Four golden signals