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Package metric

v0.11.0
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Published: Aug 25, 2020 | License: Apache-2.0 | Module: go.opentelemetry.io/otel

Overview

metric package provides an API for reporting diagnostic measurements using instruments categorized as follows:

Synchronous instruments are called by the user with a Context. Asynchronous instruments are called by the SDK during collection.

Additive instruments are semantically intended for capturing a sum. Non-additive instruments are intended for capturing a distribution.

Additive instruments may be monotonic, in which case they are non-descreasing and naturally define a rate.

The synchronous instrument names are:

Counter:           additive, monotonic
UpDownCounter:     additive
ValueRecorder:     non-additive

and the asynchronous instruments are:

SumObserver:       additive, monotonic
UpDownSumObserver: additive
ValueObserver:     non-additive

All instruments are provided with support for either float64 or int64 input values.

The Meter interface supports allocating new instruments as well as interfaces for recording batches of synchronous measurements or asynchronous observations. To obtain a Meter, use a Provider.

The Provider interface supports obtaining a named Meter interface. To obtain a Provider implementation, initialize and configure any compatible SDK.

Index

Variables

var ErrSDKReturnedNilImpl = errors.New("SDK returned a nil implementation")

ErrSDKReturnedNilImpl is returned when a new `MeterImpl` returns nil.

type AsyncBatchRunner

type AsyncBatchRunner interface {
	// Run accepts a function for capturing observations of
	// multiple instruments.
	Run(ctx context.Context, capture func([]label.KeyValue, ...Observation))

	AsyncRunner
}

AsyncBatchRunner is an interface implemented by batch-observer callbacks.

type AsyncImpl

type AsyncImpl interface {
	InstrumentImpl
}

AsyncImpl is an implementation-level interface to an asynchronous instrument (e.g., Observer instruments).

type AsyncRunner

type AsyncRunner interface {
	// AnyRunner() is a non-exported method with no functional use
	// other than to make this a non-empty interface.
	AnyRunner()
}

AsyncRunner is expected to convert into an AsyncSingleRunner or an AsyncBatchRunner. SDKs will encounter an error if the AsyncRunner does not satisfy one of these interfaces.

type AsyncSingleRunner

type AsyncSingleRunner interface {
	// Run accepts a single instrument and function for capturing
	// observations of that instrument.  Each call to the function
	// receives one captured observation.  (The function accepts
	// multiple observations so the same implementation can be
	// used for batch runners.)
	Run(ctx context.Context, single AsyncImpl, capture func([]label.KeyValue, ...Observation))

	AsyncRunner
}

AsyncSingleRunner is an interface implemented by single-observer callbacks.

type BatchObserver

type BatchObserver struct {
	// contains filtered or unexported fields
}

BatchObserver represents an Observer callback that can report observations for multiple instruments.

func (BatchObserver) NewFloat64SumObserver

func (b BatchObserver) NewFloat64SumObserver(name string, opts ...InstrumentOption) (Float64SumObserver, error)

NewFloat64SumObserver creates a new floating point SumObserver with the given name, running in a batch callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (BatchObserver) NewFloat64UpDownSumObserver

func (b BatchObserver) NewFloat64UpDownSumObserver(name string, opts ...InstrumentOption) (Float64UpDownSumObserver, error)

NewFloat64UpDownSumObserver creates a new floating point UpDownSumObserver with the given name, running in a batch callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (BatchObserver) NewFloat64ValueObserver

func (b BatchObserver) NewFloat64ValueObserver(name string, opts ...InstrumentOption) (Float64ValueObserver, error)

NewFloat64ValueObserver creates a new floating point ValueObserver with the given name, running in a batch callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (BatchObserver) NewInt64SumObserver

func (b BatchObserver) NewInt64SumObserver(name string, opts ...InstrumentOption) (Int64SumObserver, error)

NewInt64SumObserver creates a new integer SumObserver instrument with the given name, running in a batch callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (BatchObserver) NewInt64UpDownSumObserver

func (b BatchObserver) NewInt64UpDownSumObserver(name string, opts ...InstrumentOption) (Int64UpDownSumObserver, error)

NewInt64UpDownSumObserver creates a new integer UpDownSumObserver instrument with the given name, running in a batch callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (BatchObserver) NewInt64ValueObserver

func (b BatchObserver) NewInt64ValueObserver(name string, opts ...InstrumentOption) (Int64ValueObserver, error)

NewInt64ValueObserver creates a new integer ValueObserver instrument with the given name, running in a batch callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

type BatchObserverFunc

type BatchObserverFunc func(context.Context, BatchObserverResult)

BatchObserverFunc is a callback argument for use with any Observer instrument that will be reported as a batch of observations.

func (*BatchObserverFunc) AnyRunner

func (*BatchObserverFunc) AnyRunner()

AnyRunner implements AsyncRunner.

func (*BatchObserverFunc) Run

func (b *BatchObserverFunc) Run(ctx context.Context, function func([]label.KeyValue, ...Observation))

Run implements AsyncBatchRunner.

type BatchObserverMust

type BatchObserverMust struct {
	// contains filtered or unexported fields
}

BatchObserverMust is a wrapper for BatchObserver that panics when any instrument constructor encounters an error.

func (BatchObserverMust) NewFloat64SumObserver

func (bm BatchObserverMust) NewFloat64SumObserver(name string, oos ...InstrumentOption) Float64SumObserver

NewFloat64SumObserver calls `BatchObserver.NewFloat64SumObserver` and returns the instrument, panicking if it encounters an error.

func (BatchObserverMust) NewFloat64UpDownSumObserver

func (bm BatchObserverMust) NewFloat64UpDownSumObserver(name string, oos ...InstrumentOption) Float64UpDownSumObserver

NewFloat64UpDownSumObserver calls `BatchObserver.NewFloat64UpDownSumObserver` and returns the instrument, panicking if it encounters an error.

func (BatchObserverMust) NewFloat64ValueObserver

func (bm BatchObserverMust) NewFloat64ValueObserver(name string, oos ...InstrumentOption) Float64ValueObserver

NewFloat64ValueObserver calls `BatchObserver.NewFloat64ValueObserver` and returns the instrument, panicking if it encounters an error.

func (BatchObserverMust) NewInt64SumObserver

func (bm BatchObserverMust) NewInt64SumObserver(name string, oos ...InstrumentOption) Int64SumObserver

NewInt64SumObserver calls `BatchObserver.NewInt64SumObserver` and returns the instrument, panicking if it encounters an error.

func (BatchObserverMust) NewInt64UpDownSumObserver

func (bm BatchObserverMust) NewInt64UpDownSumObserver(name string, oos ...InstrumentOption) Int64UpDownSumObserver

NewInt64UpDownSumObserver calls `BatchObserver.NewInt64UpDownSumObserver` and returns the instrument, panicking if it encounters an error.

func (BatchObserverMust) NewInt64ValueObserver

func (bm BatchObserverMust) NewInt64ValueObserver(name string, oos ...InstrumentOption) Int64ValueObserver

NewInt64ValueObserver calls `BatchObserver.NewInt64ValueObserver` and returns the instrument, panicking if it encounters an error.

type BatchObserverResult

type BatchObserverResult struct {
	// contains filtered or unexported fields
}

BatchObserverResult is passed to a batch observer callback to capture observations for multiple asynchronous instruments.

func (BatchObserverResult) Observe

func (br BatchObserverResult) Observe(labels []label.KeyValue, obs ...Observation)

Observe captures a multiple observations from the associated batch instrument callback, with the given labels.

type BoundFloat64Counter

type BoundFloat64Counter struct {
	// contains filtered or unexported fields
}

BoundFloat64Counter is a bound instrument for Float64Counter.

It inherits the Unbind function from syncBoundInstrument.

func (BoundFloat64Counter) Add

func (b BoundFloat64Counter) Add(ctx context.Context, value float64)

Add adds the value to the counter's sum using the labels previously bound to this counter via Bind()

func (BoundFloat64Counter) Unbind

func (h BoundFloat64Counter) Unbind()

Unbind calls SyncImpl.Unbind.

type BoundFloat64UpDownCounter

type BoundFloat64UpDownCounter struct {
	// contains filtered or unexported fields
}

BoundFloat64UpDownCounter is a bound instrument for Float64UpDownCounter.

It inherits the Unbind function from syncBoundInstrument.

func (BoundFloat64UpDownCounter) Add

func (b BoundFloat64UpDownCounter) Add(ctx context.Context, value float64)

Add adds the value to the counter's sum using the labels previously bound to this counter via Bind()

func (BoundFloat64UpDownCounter) Unbind

func (h BoundFloat64UpDownCounter) Unbind()

Unbind calls SyncImpl.Unbind.

type BoundFloat64ValueRecorder

type BoundFloat64ValueRecorder struct {
	// contains filtered or unexported fields
}

BoundFloat64ValueRecorder is a bound instrument for Float64ValueRecorder.

It inherits the Unbind function from syncBoundInstrument.

func (BoundFloat64ValueRecorder) Record

func (b BoundFloat64ValueRecorder) Record(ctx context.Context, value float64)

Record adds a new value to the ValueRecorder's distribution using the labels previously bound to the ValueRecorder via Bind().

func (BoundFloat64ValueRecorder) Unbind

func (h BoundFloat64ValueRecorder) Unbind()

Unbind calls SyncImpl.Unbind.

type BoundInt64Counter

type BoundInt64Counter struct {
	// contains filtered or unexported fields
}

BoundInt64Counter is a boundInstrument for Int64Counter.

It inherits the Unbind function from syncBoundInstrument.

func (BoundInt64Counter) Add

func (b BoundInt64Counter) Add(ctx context.Context, value int64)

Add adds the value to the counter's sum using the labels previously bound to this counter via Bind()

func (BoundInt64Counter) Unbind

func (h BoundInt64Counter) Unbind()

Unbind calls SyncImpl.Unbind.

type BoundInt64UpDownCounter

type BoundInt64UpDownCounter struct {
	// contains filtered or unexported fields
}

BoundInt64UpDownCounter is a boundInstrument for Int64UpDownCounter.

It inherits the Unbind function from syncBoundInstrument.

func (BoundInt64UpDownCounter) Add

func (b BoundInt64UpDownCounter) Add(ctx context.Context, value int64)

Add adds the value to the counter's sum using the labels previously bound to this counter via Bind()

func (BoundInt64UpDownCounter) Unbind

func (h BoundInt64UpDownCounter) Unbind()

Unbind calls SyncImpl.Unbind.

type BoundInt64ValueRecorder

type BoundInt64ValueRecorder struct {
	// contains filtered or unexported fields
}

BoundInt64ValueRecorder is a bound instrument for Int64ValueRecorder.

It inherits the Unbind function from syncBoundInstrument.

func (BoundInt64ValueRecorder) Record

func (b BoundInt64ValueRecorder) Record(ctx context.Context, value int64)

Record adds a new value to the ValueRecorder's distribution using the labels previously bound to the ValueRecorder via Bind().

func (BoundInt64ValueRecorder) Unbind

func (h BoundInt64ValueRecorder) Unbind()

Unbind calls SyncImpl.Unbind.

type BoundSyncImpl

type BoundSyncImpl interface {

	// RecordOne captures a single synchronous metric event.
	RecordOne(ctx context.Context, number Number)

	// Unbind frees the resources associated with this bound instrument. It
	// does not affect the metric this bound instrument was created through.
	Unbind()
}

BoundSyncImpl is the implementation-level interface to a generic bound synchronous instrument

type Descriptor

type Descriptor struct {
	// contains filtered or unexported fields
}

Descriptor contains all the settings that describe an instrument, including its name, metric kind, number kind, and the configurable options.

func NewDescriptor

func NewDescriptor(name string, mkind Kind, nkind NumberKind, opts ...InstrumentOption) Descriptor

NewDescriptor returns a Descriptor with the given contents.

func (Descriptor) Description

func (d Descriptor) Description() string

Description provides a human-readable description of the metric instrument.

func (Descriptor) InstrumentationName

func (d Descriptor) InstrumentationName() string

InstrumentationName returns the name of the library that provided instrumentation for this instrument.

func (Descriptor) InstrumentationVersion

func (d Descriptor) InstrumentationVersion() string

InstrumentationVersion returns the version of the library that provided instrumentation for this instrument.

func (Descriptor) MetricKind

func (d Descriptor) MetricKind() Kind

MetricKind returns the specific kind of instrument.

func (Descriptor) Name

func (d Descriptor) Name() string

Name returns the metric instrument's name.

func (Descriptor) NumberKind

func (d Descriptor) NumberKind() NumberKind

NumberKind returns whether this instrument is declared over int64, float64, or uint64 values.

func (Descriptor) Unit

func (d Descriptor) Unit() unit.Unit

Unit describes the units of the metric instrument. Unitless metrics return the empty string.

type Float64Counter

type Float64Counter struct {
	// contains filtered or unexported fields
}

Float64Counter is a metric that accumulates float64 values.

func (Float64Counter) Add

func (c Float64Counter) Add(ctx context.Context, value float64, labels ...label.KeyValue)

Add adds the value to the counter's sum. The labels should contain the keys and values to be associated with this value.

func (Float64Counter) Bind

func (c Float64Counter) Bind(labels ...label.KeyValue) (h BoundFloat64Counter)

Bind creates a bound instrument for this counter. The labels are associated with values recorded via subsequent calls to Record.

func (Float64Counter) Measurement

func (c Float64Counter) Measurement(value float64) Measurement

Measurement creates a Measurement object to use with batch recording.

func (Float64Counter) SyncImpl

func (s Float64Counter) SyncImpl() SyncImpl

SyncImpl returns the implementation object for synchronous instruments.

type Float64ObserverFunc

type Float64ObserverFunc func(context.Context, Float64ObserverResult)

Float64ObserverFunc is a type of callback that floating point observers run.

func (*Float64ObserverFunc) AnyRunner

func (*Float64ObserverFunc) AnyRunner()

AnyRunner implements AsyncRunner.

func (*Float64ObserverFunc) Run

func (f *Float64ObserverFunc) Run(ctx context.Context, impl AsyncImpl, function func([]label.KeyValue, ...Observation))

Run implements AsyncSingleRunner.

type Float64ObserverResult

type Float64ObserverResult struct {
	// contains filtered or unexported fields
}

Float64ObserverResult is passed to an observer callback to capture observations for one asynchronous floating point metric instrument.

func (Float64ObserverResult) Observe

func (fr Float64ObserverResult) Observe(value float64, labels ...label.KeyValue)

Observe captures a single floating point value from the associated instrument callback, with the given labels.

type Float64SumObserver

type Float64SumObserver struct {
	// contains filtered or unexported fields
}

Float64SumObserver is a metric that captures a precomputed sum of float64 values at a point in time.

func (Float64SumObserver) AsyncImpl

func (a Float64SumObserver) AsyncImpl() AsyncImpl

AsyncImpl implements AsyncImpl.

func (Float64SumObserver) Observation

func (f Float64SumObserver) Observation(v float64) Observation

Observation returns an Observation, a BatchObserverFunc argument, for an asynchronous integer instrument. This returns an implementation-level object for use by the SDK, users should not refer to this.

type Float64UpDownCounter

type Float64UpDownCounter struct {
	// contains filtered or unexported fields
}

Float64UpDownCounter is a metric instrument that sums floating point values.

func (Float64UpDownCounter) Add

func (c Float64UpDownCounter) Add(ctx context.Context, value float64, labels ...label.KeyValue)

Add adds the value to the counter's sum. The labels should contain the keys and values to be associated with this value.

func (Float64UpDownCounter) Bind

func (c Float64UpDownCounter) Bind(labels ...label.KeyValue) (h BoundFloat64UpDownCounter)

Bind creates a bound instrument for this counter. The labels are associated with values recorded via subsequent calls to Record.

func (Float64UpDownCounter) Measurement

func (c Float64UpDownCounter) Measurement(value float64) Measurement

Measurement creates a Measurement object to use with batch recording.

func (Float64UpDownCounter) SyncImpl

func (s Float64UpDownCounter) SyncImpl() SyncImpl

SyncImpl returns the implementation object for synchronous instruments.

type Float64UpDownSumObserver

type Float64UpDownSumObserver struct {
	// contains filtered or unexported fields
}

Float64UpDownSumObserver is a metric that captures a precomputed sum of float64 values at a point in time.

func (Float64UpDownSumObserver) AsyncImpl

func (a Float64UpDownSumObserver) AsyncImpl() AsyncImpl

AsyncImpl implements AsyncImpl.

func (Float64UpDownSumObserver) Observation

func (f Float64UpDownSumObserver) Observation(v float64) Observation

Observation returns an Observation, a BatchObserverFunc argument, for an asynchronous integer instrument. This returns an implementation-level object for use by the SDK, users should not refer to this.

type Float64ValueObserver

type Float64ValueObserver struct {
	// contains filtered or unexported fields
}

Float64ValueObserver is a metric that captures a set of float64 values at a point in time.

func (Float64ValueObserver) AsyncImpl

func (a Float64ValueObserver) AsyncImpl() AsyncImpl

AsyncImpl implements AsyncImpl.

func (Float64ValueObserver) Observation

func (f Float64ValueObserver) Observation(v float64) Observation

Observation returns an Observation, a BatchObserverFunc argument, for an asynchronous integer instrument. This returns an implementation-level object for use by the SDK, users should not refer to this.

type Float64ValueRecorder

type Float64ValueRecorder struct {
	// contains filtered or unexported fields
}

Float64ValueRecorder is a metric that records float64 values.

func (Float64ValueRecorder) Bind

func (c Float64ValueRecorder) Bind(labels ...label.KeyValue) (h BoundFloat64ValueRecorder)

Bind creates a bound instrument for this ValueRecorder. The labels are associated with values recorded via subsequent calls to Record.

func (Float64ValueRecorder) Measurement

func (c Float64ValueRecorder) Measurement(value float64) Measurement

Measurement creates a Measurement object to use with batch recording.

func (Float64ValueRecorder) Record

func (c Float64ValueRecorder) Record(ctx context.Context, value float64, labels ...label.KeyValue)

Record adds a new value to the list of ValueRecorder's records. The labels should contain the keys and values to be associated with this value.

func (Float64ValueRecorder) SyncImpl

func (s Float64ValueRecorder) SyncImpl() SyncImpl

SyncImpl returns the implementation object for synchronous instruments.

type InstrumentConfig

type InstrumentConfig struct {
	// Description describes the instrument in human-readable terms.
	Description string
	// Unit describes the measurement unit for a instrument.
	Unit unit.Unit
	// InstrumentationName is the name of the library providing
	// instrumentation.
	InstrumentationName string
	// InstrumentationVersion is the version of the library providing
	// instrumentation.
	InstrumentationVersion string
}

InstrumentConfig contains options for instrument descriptors.

func ConfigureInstrument

func ConfigureInstrument(opts []InstrumentOption) InstrumentConfig

ConfigureInstrument is a helper that applies all the InstrumentOptions to an InstrumentConfig.

type InstrumentImpl

type InstrumentImpl interface {
	// Implementation returns the underlying implementation of the
	// instrument, which allows the implementation to gain access
	// to its own representation especially from a `Measurement`.
	Implementation() interface{}

	// Descriptor returns a copy of the instrument's Descriptor.
	Descriptor() Descriptor
}

InstrumentImpl is a common interface for synchronous and asynchronous instruments.

type InstrumentOption

type InstrumentOption interface {
	// ApplyMeter is used to set a InstrumentOption value of a
	// InstrumentConfig.
	ApplyInstrument(*InstrumentConfig)
}

InstrumentOption is an interface for applying instrument options.

func WithDescription

func WithDescription(desc string) InstrumentOption

WithDescription applies provided description.

func WithInstrumentationName

func WithInstrumentationName(name string) InstrumentOption

WithInstrumentationName sets the instrumentation name.

func WithUnit

func WithUnit(unit unit.Unit) InstrumentOption

WithUnit applies provided unit.

type Int64Counter

type Int64Counter struct {
	// contains filtered or unexported fields
}

Int64Counter is a metric that accumulates int64 values.

func (Int64Counter) Add

func (c Int64Counter) Add(ctx context.Context, value int64, labels ...label.KeyValue)

Add adds the value to the counter's sum. The labels should contain the keys and values to be associated with this value.

func (Int64Counter) Bind

func (c Int64Counter) Bind(labels ...label.KeyValue) (h BoundInt64Counter)

Bind creates a bound instrument for this counter. The labels are associated with values recorded via subsequent calls to Record.

func (Int64Counter) Measurement

func (c Int64Counter) Measurement(value int64) Measurement

Measurement creates a Measurement object to use with batch recording.

func (Int64Counter) SyncImpl

func (s Int64Counter) SyncImpl() SyncImpl

SyncImpl returns the implementation object for synchronous instruments.

type Int64ObserverFunc

type Int64ObserverFunc func(context.Context, Int64ObserverResult)

Int64ObserverFunc is a type of callback that integral observers run.

func (*Int64ObserverFunc) AnyRunner

func (*Int64ObserverFunc) AnyRunner()

AnyRunner implements AsyncRunner.

func (*Int64ObserverFunc) Run

func (i *Int64ObserverFunc) Run(ctx context.Context, impl AsyncImpl, function func([]label.KeyValue, ...Observation))

Run implements AsyncSingleRunner.

type Int64ObserverResult

type Int64ObserverResult struct {
	// contains filtered or unexported fields
}

Int64ObserverResult is passed to an observer callback to capture observations for one asynchronous integer metric instrument.

func (Int64ObserverResult) Observe

func (ir Int64ObserverResult) Observe(value int64, labels ...label.KeyValue)

Observe captures a single integer value from the associated instrument callback, with the given labels.

type Int64SumObserver

type Int64SumObserver struct {
	// contains filtered or unexported fields
}

Int64SumObserver is a metric that captures a precomputed sum of int64 values at a point in time.

func (Int64SumObserver) AsyncImpl

func (a Int64SumObserver) AsyncImpl() AsyncImpl

AsyncImpl implements AsyncImpl.

func (Int64SumObserver) Observation

func (i Int64SumObserver) Observation(v int64) Observation

Observation returns an Observation, a BatchObserverFunc argument, for an asynchronous integer instrument. This returns an implementation-level object for use by the SDK, users should not refer to this.

type Int64UpDownCounter

type Int64UpDownCounter struct {
	// contains filtered or unexported fields
}

Int64UpDownCounter is a metric instrument that sums integer values.

func (Int64UpDownCounter) Add

func (c Int64UpDownCounter) Add(ctx context.Context, value int64, labels ...label.KeyValue)

Add adds the value to the counter's sum. The labels should contain the keys and values to be associated with this value.

func (Int64UpDownCounter) Bind

func (c Int64UpDownCounter) Bind(labels ...label.KeyValue) (h BoundInt64UpDownCounter)

Bind creates a bound instrument for this counter. The labels are associated with values recorded via subsequent calls to Record.

func (Int64UpDownCounter) Measurement

func (c Int64UpDownCounter) Measurement(value int64) Measurement

Measurement creates a Measurement object to use with batch recording.

func (Int64UpDownCounter) SyncImpl

func (s Int64UpDownCounter) SyncImpl() SyncImpl

SyncImpl returns the implementation object for synchronous instruments.

type Int64UpDownSumObserver

type Int64UpDownSumObserver struct {
	// contains filtered or unexported fields
}

Int64UpDownSumObserver is a metric that captures a precomputed sum of int64 values at a point in time.

func (Int64UpDownSumObserver) AsyncImpl

func (a Int64UpDownSumObserver) AsyncImpl() AsyncImpl

AsyncImpl implements AsyncImpl.

func (Int64UpDownSumObserver) Observation

func (i Int64UpDownSumObserver) Observation(v int64) Observation

Observation returns an Observation, a BatchObserverFunc argument, for an asynchronous integer instrument. This returns an implementation-level object for use by the SDK, users should not refer to this.

type Int64ValueObserver

type Int64ValueObserver struct {
	// contains filtered or unexported fields
}

Int64ValueObserver is a metric that captures a set of int64 values at a point in time.

func (Int64ValueObserver) AsyncImpl

func (a Int64ValueObserver) AsyncImpl() AsyncImpl

AsyncImpl implements AsyncImpl.

func (Int64ValueObserver) Observation

func (i Int64ValueObserver) Observation(v int64) Observation

Observation returns an Observation, a BatchObserverFunc argument, for an asynchronous integer instrument. This returns an implementation-level object for use by the SDK, users should not refer to this.

type Int64ValueRecorder

type Int64ValueRecorder struct {
	// contains filtered or unexported fields
}

Int64ValueRecorder is a metric that records int64 values.

func (Int64ValueRecorder) Bind

func (c Int64ValueRecorder) Bind(labels ...label.KeyValue) (h BoundInt64ValueRecorder)

Bind creates a bound instrument for this ValueRecorder. The labels are associated with values recorded via subsequent calls to Record.

func (Int64ValueRecorder) Measurement

func (c Int64ValueRecorder) Measurement(value int64) Measurement

Measurement creates a Measurement object to use with batch recording.

func (Int64ValueRecorder) Record

func (c Int64ValueRecorder) Record(ctx context.Context, value int64, labels ...label.KeyValue)

Record adds a new value to the ValueRecorder's distribution. The labels should contain the keys and values to be associated with this value.

func (Int64ValueRecorder) SyncImpl

func (s Int64ValueRecorder) SyncImpl() SyncImpl

SyncImpl returns the implementation object for synchronous instruments.

type Kind

type Kind int8

Kind describes the kind of instrument.

const (
	// ValueRecorderKind indicates a ValueRecorder instrument.
	ValueRecorderKind Kind = iota
	// ValueObserverKind indicates an ValueObserver instrument.
	ValueObserverKind

	// CounterKind indicates a Counter instrument.
	CounterKind
	// UpDownCounterKind indicates a UpDownCounter instrument.
	UpDownCounterKind

	// SumObserverKind indicates a SumObserver instrument.
	SumObserverKind
	// UpDownSumObserverKind indicates a UpDownSumObserver instrument.
	UpDownSumObserverKind
)

func (Kind) Adding

func (k Kind) Adding() bool

Adding returns whether this kind of instrument adds its inputs (as opposed to Grouping).

func (Kind) Asynchronous

func (k Kind) Asynchronous() bool

Asynchronous returns whether this is an asynchronous kind of instrument.

func (Kind) Grouping

func (k Kind) Grouping() bool

Adding returns whether this kind of instrument groups its inputs (as opposed to Adding).

func (Kind) Monotonic

func (k Kind) Monotonic() bool

Monotonic returns whether this kind of instrument exposes a non-decreasing sum.

func (Kind) PrecomputedSum

func (k Kind) PrecomputedSum() bool

Cumulative returns whether this kind of instrument receives precomputed sums.

func (Kind) String

func (i Kind) String() string

func (Kind) Synchronous

func (k Kind) Synchronous() bool

Synchronous returns whether this is a synchronous kind of instrument.

type Measurement

type Measurement struct {
	// contains filtered or unexported fields
}

Measurement is used for reporting a synchronous batch of metric values. Instances of this type should be created by synchronous instruments (e.g., Int64Counter.Measurement()).

func (Measurement) Number

func (m Measurement) Number() Number

Number returns a number recorded in this measurement.

func (Measurement) SyncImpl

func (m Measurement) SyncImpl() SyncImpl

SyncImpl returns the instrument that created this measurement. This returns an implementation-level object for use by the SDK, users should not refer to this.

type Meter

type Meter struct {
	// contains filtered or unexported fields
}

Meter is the OpenTelemetry metric API, based on a `MeterImpl` implementation and the `Meter` library name.

An uninitialized Meter is a no-op implementation.

func WrapMeterImpl

func WrapMeterImpl(impl MeterImpl, instrumentatioName string, opts ...MeterOption) Meter

WrapMeterImpl constructs a `Meter` implementation from a `MeterImpl` implementation.

func (Meter) MeterImpl

func (m Meter) MeterImpl() MeterImpl

MeterImpl returns the underlying MeterImpl of this Meter.

func (Meter) NewBatchObserver

func (m Meter) NewBatchObserver(callback BatchObserverFunc) BatchObserver

NewBatchObserver creates a new BatchObserver that supports making batches of observations for multiple instruments.

func (Meter) NewFloat64Counter

func (m Meter) NewFloat64Counter(name string, options ...InstrumentOption) (Float64Counter, error)

NewFloat64Counter creates a new floating point Counter with the given name, customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewFloat64SumObserver

func (m Meter) NewFloat64SumObserver(name string, callback Float64ObserverFunc, opts ...InstrumentOption) (Float64SumObserver, error)

NewFloat64SumObserver creates a new floating point SumObserver with the given name, running a given callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewFloat64UpDownCounter

func (m Meter) NewFloat64UpDownCounter(name string, options ...InstrumentOption) (Float64UpDownCounter, error)

NewFloat64UpDownCounter creates a new floating point UpDownCounter with the given name, customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewFloat64UpDownSumObserver

func (m Meter) NewFloat64UpDownSumObserver(name string, callback Float64ObserverFunc, opts ...InstrumentOption) (Float64UpDownSumObserver, error)

NewFloat64UpDownSumObserver creates a new floating point UpDownSumObserver with the given name, running a given callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewFloat64ValueObserver

func (m Meter) NewFloat64ValueObserver(name string, callback Float64ObserverFunc, opts ...InstrumentOption) (Float64ValueObserver, error)

NewFloat64ValueObserver creates a new floating point ValueObserver with the given name, running a given callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewFloat64ValueRecorder

func (m Meter) NewFloat64ValueRecorder(name string, opts ...InstrumentOption) (Float64ValueRecorder, error)

NewFloat64ValueRecorder creates a new floating point ValueRecorder with the given name, customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewInt64Counter

func (m Meter) NewInt64Counter(name string, options ...InstrumentOption) (Int64Counter, error)

NewInt64Counter creates a new integer Counter instrument with the given name, customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewInt64SumObserver

func (m Meter) NewInt64SumObserver(name string, callback Int64ObserverFunc, opts ...InstrumentOption) (Int64SumObserver, error)

NewInt64SumObserver creates a new integer SumObserver instrument with the given name, running a given callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewInt64UpDownCounter

func (m Meter) NewInt64UpDownCounter(name string, options ...InstrumentOption) (Int64UpDownCounter, error)

NewInt64UpDownCounter creates a new integer UpDownCounter instrument with the given name, customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewInt64UpDownSumObserver

func (m Meter) NewInt64UpDownSumObserver(name string, callback Int64ObserverFunc, opts ...InstrumentOption) (Int64UpDownSumObserver, error)

NewInt64UpDownSumObserver creates a new integer UpDownSumObserver instrument with the given name, running a given callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewInt64ValueObserver

func (m Meter) NewInt64ValueObserver(name string, callback Int64ObserverFunc, opts ...InstrumentOption) (Int64ValueObserver, error)

NewInt64ValueObserver creates a new integer ValueObserver instrument with the given name, running a given callback, and customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) NewInt64ValueRecorder

func (m Meter) NewInt64ValueRecorder(name string, opts ...InstrumentOption) (Int64ValueRecorder, error)

NewInt64ValueRecorder creates a new integer ValueRecorder instrument with the given name, customized with options. May return an error if the name is invalid (e.g., empty) or improperly registered (e.g., duplicate registration).

func (Meter) RecordBatch

func (m Meter) RecordBatch(ctx context.Context, ls []label.KeyValue, ms ...Measurement)

RecordBatch atomically records a batch of measurements.

type MeterConfig

type MeterConfig struct {
	// InstrumentationVersion is the version of the library providing
	// instrumentation.
	InstrumentationVersion string
}

MeterConfig contains options for Meters.

func ConfigureMeter

func ConfigureMeter(opts []MeterOption) MeterConfig

ConfigureMeter is a helper that applies all the MeterOptions to a MeterConfig.

type MeterImpl

type MeterImpl interface {
	// RecordBatch atomically records a batch of measurements.
	RecordBatch(context.Context, []label.KeyValue, ...Measurement)

	// NewSyncInstrument returns a newly constructed
	// synchronous instrument implementation or an error, should
	// one occur.
	NewSyncInstrument(descriptor Descriptor) (SyncImpl, error)

	// NewAsyncInstrument returns a newly constructed
	// asynchronous instrument implementation or an error, should
	// one occur.
	NewAsyncInstrument(
		descriptor Descriptor,
		runner AsyncRunner,
	) (AsyncImpl, error)
}

MeterImpl is the interface an SDK must implement to supply a Meter implementation.

type MeterMust

type MeterMust struct {
	// contains filtered or unexported fields
}

MeterMust is a wrapper for Meter interfaces that panics when any instrument constructor encounters an error.

func Must

func Must(meter Meter) MeterMust

Must constructs a MeterMust implementation from a Meter, allowing the application to panic when any instrument constructor yields an error.

func (MeterMust) NewBatchObserver

func (mm MeterMust) NewBatchObserver(callback BatchObserverFunc) BatchObserverMust

NewBatchObserver returns a wrapper around BatchObserver that panics when any instrument constructor returns an error.

func (MeterMust) NewFloat64Counter

func (mm MeterMust) NewFloat64Counter(name string, cos ...InstrumentOption) Float64Counter

NewFloat64Counter calls `Meter.NewFloat64Counter` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewFloat64SumObserver

func (mm MeterMust) NewFloat64SumObserver(name string, callback Float64ObserverFunc, oos ...InstrumentOption) Float64SumObserver

NewFloat64SumObserver calls `Meter.NewFloat64SumObserver` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewFloat64UpDownCounter

func (mm MeterMust) NewFloat64UpDownCounter(name string, cos ...InstrumentOption) Float64UpDownCounter

NewFloat64UpDownCounter calls `Meter.NewFloat64UpDownCounter` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewFloat64UpDownSumObserver

func (mm MeterMust) NewFloat64UpDownSumObserver(name string, callback Float64ObserverFunc, oos ...InstrumentOption) Float64UpDownSumObserver

NewFloat64UpDownSumObserver calls `Meter.NewFloat64UpDownSumObserver` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewFloat64ValueObserver

func (mm MeterMust) NewFloat64ValueObserver(name string, callback Float64ObserverFunc, oos ...InstrumentOption) Float64ValueObserver

NewFloat64ValueObserver calls `Meter.NewFloat64ValueObserver` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewFloat64ValueRecorder

func (mm MeterMust) NewFloat64ValueRecorder(name string, mos ...InstrumentOption) Float64ValueRecorder

NewFloat64ValueRecorder calls `Meter.NewFloat64ValueRecorder` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewInt64Counter

func (mm MeterMust) NewInt64Counter(name string, cos ...InstrumentOption) Int64Counter

NewInt64Counter calls `Meter.NewInt64Counter` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewInt64SumObserver

func (mm MeterMust) NewInt64SumObserver(name string, callback Int64ObserverFunc, oos ...InstrumentOption) Int64SumObserver

NewInt64SumObserver calls `Meter.NewInt64SumObserver` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewInt64UpDownCounter

func (mm MeterMust) NewInt64UpDownCounter(name string, cos ...InstrumentOption) Int64UpDownCounter

NewInt64UpDownCounter calls `Meter.NewInt64UpDownCounter` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewInt64UpDownSumObserver

func (mm MeterMust) NewInt64UpDownSumObserver(name string, callback Int64ObserverFunc, oos ...InstrumentOption) Int64UpDownSumObserver

NewInt64UpDownSumObserver calls `Meter.NewInt64UpDownSumObserver` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewInt64ValueObserver

func (mm MeterMust) NewInt64ValueObserver(name string, callback Int64ObserverFunc, oos ...InstrumentOption) Int64ValueObserver

NewInt64ValueObserver calls `Meter.NewInt64ValueObserver` and returns the instrument, panicking if it encounters an error.

func (MeterMust) NewInt64ValueRecorder

func (mm MeterMust) NewInt64ValueRecorder(name string, mos ...InstrumentOption) Int64ValueRecorder

NewInt64ValueRecorder calls `Meter.NewInt64ValueRecorder` and returns the instrument, panicking if it encounters an error.

type MeterOption

type MeterOption interface {
	// ApplyMeter is used to set a MeterOption value of a MeterConfig.
	ApplyMeter(*MeterConfig)
}

MeterOption is an interface for applying Meter options.

type NoopAsync

type NoopAsync struct {
	// contains filtered or unexported fields
}

func (NoopAsync) Descriptor

func (NoopAsync) Descriptor() Descriptor

func (NoopAsync) Implementation

func (NoopAsync) Implementation() interface{}

type NoopProvider

type NoopProvider struct{}

func (NoopProvider) Meter

func (NoopProvider) Meter(_ string, _ ...MeterOption) Meter

type NoopSync

type NoopSync struct {
	// contains filtered or unexported fields
}

func (NoopSync) Bind

func (NoopSync) Bind([]label.KeyValue) BoundSyncImpl

func (NoopSync) Descriptor

func (NoopSync) Descriptor() Descriptor

func (NoopSync) Implementation

func (NoopSync) Implementation() interface{}

func (NoopSync) RecordOne

func (NoopSync) RecordOne(context.Context, Number, []label.KeyValue)

type Number

type Number uint64

Number represents either an integral or a floating point value. It needs to be accompanied with a source of NumberKind that describes the actual type of the value stored within Number.

func NewFloat64Number

func NewFloat64Number(f float64) Number

NewFloat64Number creates a floating point Number.

func NewInt64Number

func NewInt64Number(i int64) Number

NewInt64Number creates an integral Number.

func NewNumberFromRaw

func NewNumberFromRaw(r uint64) Number

NewNumberFromRaw creates a new Number from a raw value.

func NewNumberSignChange

func NewNumberSignChange(kind NumberKind, nn Number) Number

NewNumberSignChange returns a number with the same magnitude and the opposite sign. `kind` must describe the kind of number in `nn`.

Does not change Uint64NumberKind values.

func (*Number) AddFloat64

func (n *Number) AddFloat64(f float64)

AddFloat64 assumes that the number contains a float64 and adds the passed float64 to it.

func (*Number) AddFloat64Atomic

func (n *Number) AddFloat64Atomic(f float64)

AddFloat64Atomic assumes that the number contains a float64 and adds the passed float64 to it atomically.

func (*Number) AddInt64

func (n *Number) AddInt64(i int64)

AddInt64 assumes that the number contains an int64 and adds the passed int64 to it.

func (*Number) AddInt64Atomic

func (n *Number) AddInt64Atomic(i int64)

AddInt64Atomic assumes that the number contains an int64 and adds the passed int64 to it atomically.

func (*Number) AddNumber

func (n *Number) AddNumber(kind NumberKind, nn Number)

AddNumber assumes that this and the passed number are of the passed kind and adds the passed number to this number.

func (*Number) AddNumberAtomic

func (n *Number) AddNumberAtomic(kind NumberKind, nn Number)

AddNumberAtomic assumes that this and the passed number are of the passed kind and adds the passed number to this number atomically.

func (*Number) AddRaw

func (n *Number) AddRaw(kind NumberKind, r uint64)

AddRaw assumes that this number and the passed raw value are of the passed kind and adds the passed raw value to this number.

func (*Number) AddRawAtomic

func (n *Number) AddRawAtomic(kind NumberKind, r uint64)

AddRawAtomic assumes that this number and the passed raw value are of the passed kind and adds the passed raw value to this number atomically.

func (*Number) AsFloat64

func (n *Number) AsFloat64() float64

AsFloat64 assumes that the measurement value contains a float64 and returns it as such.

func (*Number) AsFloat64Atomic

func (n *Number) AsFloat64Atomic() float64

AsFloat64Atomic assumes that the measurement value contains a float64 and returns it as such atomically.

func (*Number) AsFloat64Ptr

func (n *Number) AsFloat64Ptr() *float64

AsFloat64Ptr assumes that the number contains a float64 and returns a pointer to it.

func (*Number) AsInt64

func (n *Number) AsInt64() int64

AsInt64 assumes that the value contains an int64 and returns it as such.

func (*Number) AsInt64Atomic

func (n *Number) AsInt64Atomic() int64

AsInt64Atomic assumes that the number contains an int64 and returns it as such atomically.

func (*Number) AsInt64Ptr

func (n *Number) AsInt64Ptr() *int64

AsInt64Ptr assumes that the number contains an int64 and returns a pointer to it.

func (*Number) AsInterface

func (n *Number) AsInterface(kind NumberKind) interface{}

AsInterface returns the number as an interface{}, typically used for NumberKind-correct JSON conversion.

func (*Number) AsNumber

func (n *Number) AsNumber() Number

AsNumber gets the Number.

func (*Number) AsNumberAtomic

func (n *Number) AsNumberAtomic() Number

AsNumberAtomic gets the Number atomically.

func (*Number) AsRaw

func (n *Number) AsRaw() uint64

AsRaw gets the uninterpreted raw value. Might be useful for some atomic operations.

func (*Number) AsRawAtomic

func (n *Number) AsRawAtomic() uint64

AsRawAtomic gets the uninterpreted raw value atomically. Might be useful for some atomic operations.

func (*Number) AsRawPtr

func (n *Number) AsRawPtr() *uint64

AsRawPtr gets the pointer to the raw, uninterpreted raw value. Might be useful for some atomic operations.

func (*Number) CoerceToFloat64

func (n *Number) CoerceToFloat64(kind NumberKind) float64

CoerceToFloat64 casts the number to float64. May result in data/precision loss.

func (*Number) CoerceToInt64

func (n *Number) CoerceToInt64(kind NumberKind) int64

CoerceToInt64 casts the number to int64. May result in data/precision loss.

func (*Number) CompareAndSwapFloat64

func (n *Number) CompareAndSwapFloat64(of, nf float64) bool

CompareAndSwapFloat64 assumes that this number contains a float64 and does the atomic CAS operation on it.

func (*Number) CompareAndSwapInt64

func (n *Number) CompareAndSwapInt64(oi, ni int64) bool

CompareAndSwapInt64 assumes that this number contains an int64 and does the atomic CAS operation on it.

func (*Number) CompareAndSwapNumber

func (n *Number) CompareAndSwapNumber(on, nn Number) bool

CompareAndSwapNumber does the atomic CAS operation on this number. This number and passed old and new numbers should be of the same kind.

func (*Number) CompareAndSwapRaw

func (n *Number) CompareAndSwapRaw(or, nr uint64) bool

CompareAndSwapRaw does the atomic CAS operation on this number. This number and passed old and new raw values should be of the same kind.

func (*Number) CompareFloat64

func (n *Number) CompareFloat64(f float64) int

CompareFloat64 assumes that the Number contains a float64 and performs a comparison between the value and the other value. It returns the typical result of the compare function: -1 if the value is less than the other, 0 if both are equal, 1 if the value is greater than the other.

Do not compare NaN values.

func (*Number) CompareInt64

func (n *Number) CompareInt64(i int64) int

CompareInt64 assumes that the Number contains an int64 and performs a comparison between the value and the other value. It returns the typical result of the compare function: -1 if the value is less than the other, 0 if both are equal, 1 if the value is greater than the other.

func (*Number) CompareNumber

func (n *Number) CompareNumber(kind NumberKind, nn Number) int

CompareNumber compares two Numbers given their kind. Both numbers should have the same kind. This returns:

0 if the numbers are equal
-1 if the subject `n` is less than the argument `nn`
+1 if the subject `n` is greater than the argument `nn`

func (*Number) CompareRaw

func (n *Number) CompareRaw(kind NumberKind, r uint64) int

CompareRaw compares two numbers, where one is input as a raw uint64, interpreting both values as a `kind` of number.

func (*Number) Emit

func (n *Number) Emit(kind NumberKind) string

Emit returns a string representation of the raw value of the Number. A %d is used for integral values, %f for floating point values.

func (*Number) IsNegative

func (n *Number) IsNegative(kind NumberKind) bool

IsNegative returns true if the actual value is less than zero.

func (*Number) IsPositive

func (n *Number) IsPositive(kind NumberKind) bool

IsPositive returns true if the actual value is greater than zero.

func (*Number) IsZero

func (n *Number) IsZero(kind NumberKind) bool

IsZero returns true if the actual value is equal to zero.

func (*Number) SetFloat64

func (n *Number) SetFloat64(f float64)

SetFloat64 assumes that the number contains a float64 and sets it to the passed value.

func (*Number) SetFloat64Atomic

func (n *Number) SetFloat64Atomic(f float64)

SetFloat64Atomic assumes that the number contains a float64 and sets it to the passed value atomically.

func (*Number) SetInt64

func (n *Number) SetInt64(i int64)

SetInt64 assumes that the number contains an int64 and sets it to the passed value.

func (*Number) SetInt64Atomic

func (n *Number) SetInt64Atomic(i int64)

SetInt64Atomic assumes that the number contains an int64 and sets it to the passed value atomically.

func (*Number) SetNumber

func (n *Number) SetNumber(nn Number)

SetNumber sets the number to the passed number. Both should be of the same kind.

func (*Number) SetNumberAtomic

func (n *Number) SetNumberAtomic(nn Number)

SetNumberAtomic sets the number to the passed number atomically. Both should be of the same kind.

func (*Number) SetRaw

func (n *Number) SetRaw(r uint64)

SetRaw sets the number to the passed raw value. Both number and the raw number should represent the same kind.

func (*Number) SetRawAtomic

func (n *Number) SetRawAtomic(r uint64)

SetRawAtomic sets the number to the passed raw value atomically. Both number and the raw number should represent the same kind.

func (*Number) SwapFloat64

func (n *Number) SwapFloat64(f float64) float64

SwapFloat64 assumes that the number contains an float64, sets it to the passed value and returns the old float64 value.

func (*Number) SwapFloat64Atomic

func (n *Number) SwapFloat64Atomic(f float64) float64

SwapFloat64Atomic assumes that the number contains an float64, sets it to the passed value and returns the old float64 value atomically.

func (*Number) SwapInt64

func (n *Number) SwapInt64(i int64) int64

SwapInt64 assumes that the number contains an int64, sets it to the passed value and returns the old int64 value.

func (*Number) SwapInt64Atomic

func (n *Number) SwapInt64Atomic(i int64) int64

SwapInt64Atomic assumes that the number contains an int64, sets it to the passed value and returns the old int64 value atomically.

func (*Number) SwapNumber

func (n *Number) SwapNumber(nn Number) Number

SwapNumber sets the number to the passed number and returns the old number. Both this number and the passed number should be of the same kind.

func (*Number) SwapNumberAtomic

func (n *Number) SwapNumberAtomic(nn Number) Number

SwapNumberAtomic sets the number to the passed number and returns the old number atomically. Both this number and the passed number should be of the same kind.

func (*Number) SwapRaw

func (n *Number) SwapRaw(r uint64) uint64

SwapRaw sets the number to the passed raw value and returns the old raw value. Both number and the raw number should represent the same kind.

func (*Number) SwapRawAtomic

func (n *Number) SwapRawAtomic(r uint64) uint64

SwapRawAtomic sets the number to the passed raw value and returns the old raw value atomically. Both number and the raw number should represent the same kind.

type NumberKind

type NumberKind int8

NumberKind describes the data type of the Number.

const (
	// Int64NumberKind means that the Number stores int64.
	Int64NumberKind NumberKind = iota
	// Float64NumberKind means that the Number stores float64.
	Float64NumberKind
)

func (NumberKind) Maximum

func (k NumberKind) Maximum() Number

Maximum returns the maximum representable value for a given NumberKind

func (NumberKind) Minimum

func (k NumberKind) Minimum() Number

Minimum returns the minimum representable value for a given NumberKind

func (NumberKind) String

func (i NumberKind) String() string

func (NumberKind) Zero

func (k NumberKind) Zero() Number

Zero returns a zero value for a given NumberKind

type Observation

type Observation struct {
	// contains filtered or unexported fields
}

Observation is used for reporting an asynchronous batch of metric values. Instances of this type should be created by asynchronous instruments (e.g., Int64ValueObserver.Observation()).

func (Observation) AsyncImpl

func (m Observation) AsyncImpl() AsyncImpl

AsyncImpl returns the instrument that created this observation. This returns an implementation-level object for use by the SDK, users should not refer to this.

func (Observation) Number

func (m Observation) Number() Number

Number returns a number recorded in this observation.

type Option

type Option interface {
	InstrumentOption
	MeterOption
}

Option is an interface for applying Instrument or Meter options.

func WithInstrumentationVersion

func WithInstrumentationVersion(version string) Option

WithInstrumentationVersion sets the instrumentation version.

type Provider

type Provider interface {
	// Meter creates an implementation of the Meter interface.
	// The instrumentationName must be the name of the library providing
	// instrumentation. This name may be the same as the instrumented code
	// only if that code provides built-in instrumentation. If the
	// instrumentationName is empty, then a implementation defined default
	// name will be used instead.
	Meter(instrumentationName string, opts ...MeterOption) Meter
}

Provider supports named Meter instances.

type SyncImpl

type SyncImpl interface {
	InstrumentImpl

	// Bind creates an implementation-level bound instrument,
	// binding a label set with this instrument implementation.
	Bind(labels []label.KeyValue) BoundSyncImpl

	// RecordOne captures a single synchronous metric event.
	RecordOne(ctx context.Context, number Number, labels []label.KeyValue)
}

SyncImpl is the implementation-level interface to a generic synchronous instrument (e.g., ValueRecorder and Counter instruments).

Package Files

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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