A Service-Level Indicator (SLI) describes the
“performance” of a service. For some services, the SLI is well-defined.
In such cases, the SLI can be described easily by referencing the
well-known SLI and providing the needed parameters. Alternatively, a
“custom” SLI can be defined with a query to the underlying metric store.
An SLI is defined to be good_service / total_service over any
queried time interval. The value of performance always falls into the
range 0 <= performance <= 1. A custom SLI describes how to compute
this ratio, whether this is by dividing values from a pair of time
series, cutting a Distribution into good and bad counts, or counting
time windows in which the service complies with a criterion. For
separation of concerns, a single Service-Level Indicator measures
performance for only one aspect of service quality, such as fraction of
successful queries or fast-enough queries.
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