Meter class

SDK implementation of the APIMeter interface.

A Meter is the entry point for creating instruments that collect measurements for a specific instrumentation scope. Meters are obtained from a MeterProvider, and each Meter is associated with a specific instrumentation library, version, and optional schema URL.

The Meter follows the OpenTelemetry metrics data model which consists of instruments that record measurements, which are then aggregated into metrics. This implementation delegates to the API implementation while adding SDK-specific behaviors.

More information: https://opentelemetry.io/docs/specs/otel/metrics/api/ https://opentelemetry.io/docs/specs/otel/metrics/sdk/

Implemented types

• APIMeter

Properties

attributes → Attributes?

Gets the attributes associated with this meter.

no setter, override

hashCode → int

The hash code for this object.

no setter, inherited

name → String

Gets the name of the instrumentation scope.

no setter, override

provider → MeterProvider

Gets the MeterProvider that created this Meter.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

schemaUrl → String?

Gets the schema URL of the instrumentation scope.

no setter, override

version → String?

Gets the version of the instrumentation scope.

no setter, override

Methods

createCounter<T extends num>({required String name, String? unit, String? description, InstrumentAdvisory? advisory}) → APICounter<T>

Creates a Counter instrument for recording cumulative, monotonically increasing values.

override

createGauge<T extends num>({required String name, String? unit, String? description, InstrumentAdvisory? advisory}) → APIGauge<T>

Creates a Gauge instrument for recording the current value at the time of measurement.

override

createHistogram<T extends num>({required String name, String? unit, String? description, List<double>? boundaries, InstrumentAdvisory? advisory}) → APIHistogram<T>

Creates a Histogram instrument for recording a distribution of values.

override

createObservableCounter<T extends num>({required String name, String? unit, String? description, InstrumentAdvisory? advisory, List<ObservableCallback<T>> callbacks = const [], ObservableCallback<T>? callback}) → APIObservableCounter<T>

Creates an ObservableCounter instrument for asynchronously recording cumulative, monotonically increasing values.

override

createObservableGauge<T extends num>({required String name, String? unit, String? description, InstrumentAdvisory? advisory, List<ObservableCallback<T>> callbacks = const [], ObservableCallback<T>? callback}) → APIObservableGauge<T>

Creates an ObservableGauge instrument for asynchronously recording the current value at collection time.

override

createObservableUpDownCounter<T extends num>({required String name, String? unit, String? description, InstrumentAdvisory? advisory, List<ObservableCallback<T>> callbacks = const [], ObservableCallback<T>? callback}) → APIObservableUpDownCounter<T>

Creates an ObservableUpDownCounter instrument for asynchronously recording cumulative values that can increase or decrease.

override

createUpDownCounter<T extends num>({required String name, String? unit, String? description, InstrumentAdvisory? advisory}) → APIUpDownCounter<T>

Creates an UpDownCounter instrument for recording cumulative values that can increase or decrease.

override

isEnabled() → bool

Indicates whether this meter is enabled.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

registerBatchCallback(BatchObservableCallback callback, Set<APIObservableInstrument> instruments) → APIBatchCallbackRegistration

Registers one callback that observes several of this meter's asynchronous instruments at once.

override

runBatchCallbacks() → void

Invokes every registered batch callback once, queuing its observations on the instruments it covers for their next collect().

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited