ServiceLevelIndicator class Null safety

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.


ServiceLevelIndicator({BasicSli? basicSli, RequestBasedSli? requestBased, WindowsBasedSli? windowsBased})
ServiceLevelIndicator.fromJson(Map json_)


basicSli BasicSli?
Basic SLI on a well-known service type.
read / write
hashCode int
The hash code for this object.
requestBased RequestBasedSli?
Request-based SLIs
read / write
runtimeType Type
A representation of the runtime type of the object.
windowsBased WindowsBasedSli?
Windows-based SLIs
read / write


noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
toJson() Map<String, dynamic>
toString() String
A string representation of this object.


operator ==(Object other) bool
The equality operator.