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What are SLIs/SLOs/SLAs and how do they relate?

An SLI is a service level indicator—a carefully defined quantitative measure of some aspect of the level of service that is provided. The SLI should closely represent the user of the services' (machine or human) experience.

An SLO is a service level objective: a target value or range of values for a service level that is measured by an SLI. A natural structure for SLOs is thus SLI ≤ target, or lower bound ≤ SLI ≤ upper bound.

Finally, SLAs are service level agreements: an explicit or implicit contract with your users that includes consequences of meeting (or missing) the SLOs they contain.