139 lines
7.4 KiB
Go
139 lines
7.4 KiB
Go
// Copyright The OpenTelemetry Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package metric // import "go.opentelemetry.io/otel/metric"
|
|
|
|
import (
|
|
"context"
|
|
|
|
"go.opentelemetry.io/otel/attribute"
|
|
"go.opentelemetry.io/otel/metric/instrument"
|
|
)
|
|
|
|
// MeterProvider provides access to named Meter instances, for instrumenting
|
|
// an application or library.
|
|
//
|
|
// Warning: methods may be added to this interface in minor releases.
|
|
type MeterProvider interface {
|
|
// Meter creates an instance of a `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
|
|
}
|
|
|
|
// Meter provides access to instrument instances for recording metrics.
|
|
//
|
|
// Warning: methods may be added to this interface in minor releases.
|
|
type Meter interface {
|
|
// Int64Counter returns a new instrument identified by name and configured
|
|
// with options. The instrument is used to synchronously record increasing
|
|
// int64 measurements during a computational operation.
|
|
Int64Counter(name string, options ...instrument.Int64Option) (instrument.Int64Counter, error)
|
|
// Int64UpDownCounter returns a new instrument identified by name and
|
|
// configured with options. The instrument is used to synchronously record
|
|
// int64 measurements during a computational operation.
|
|
Int64UpDownCounter(name string, options ...instrument.Int64Option) (instrument.Int64UpDownCounter, error)
|
|
// Int64Histogram returns a new instrument identified by name and
|
|
// configured with options. The instrument is used to synchronously record
|
|
// the distribution of int64 measurements during a computational operation.
|
|
Int64Histogram(name string, options ...instrument.Int64Option) (instrument.Int64Histogram, error)
|
|
// Int64ObservableCounter returns a new instrument identified by name and
|
|
// configured with options. The instrument is used to asynchronously record
|
|
// increasing int64 measurements once per a measurement collection cycle.
|
|
Int64ObservableCounter(name string, options ...instrument.Int64ObserverOption) (instrument.Int64ObservableCounter, error)
|
|
// Int64ObservableUpDownCounter returns a new instrument identified by name
|
|
// and configured with options. The instrument is used to asynchronously
|
|
// record int64 measurements once per a measurement collection cycle.
|
|
Int64ObservableUpDownCounter(name string, options ...instrument.Int64ObserverOption) (instrument.Int64ObservableUpDownCounter, error)
|
|
// Int64ObservableGauge returns a new instrument identified by name and
|
|
// configured with options. The instrument is used to asynchronously record
|
|
// instantaneous int64 measurements once per a measurement collection
|
|
// cycle.
|
|
Int64ObservableGauge(name string, options ...instrument.Int64ObserverOption) (instrument.Int64ObservableGauge, error)
|
|
|
|
// Float64Counter returns a new instrument identified by name and
|
|
// configured with options. The instrument is used to synchronously record
|
|
// increasing float64 measurements during a computational operation.
|
|
Float64Counter(name string, options ...instrument.Float64Option) (instrument.Float64Counter, error)
|
|
// Float64UpDownCounter returns a new instrument identified by name and
|
|
// configured with options. The instrument is used to synchronously record
|
|
// float64 measurements during a computational operation.
|
|
Float64UpDownCounter(name string, options ...instrument.Float64Option) (instrument.Float64UpDownCounter, error)
|
|
// Float64Histogram returns a new instrument identified by name and
|
|
// configured with options. The instrument is used to synchronously record
|
|
// the distribution of float64 measurements during a computational
|
|
// operation.
|
|
Float64Histogram(name string, options ...instrument.Float64Option) (instrument.Float64Histogram, error)
|
|
// Float64ObservableCounter returns a new instrument identified by name and
|
|
// configured with options. The instrument is used to asynchronously record
|
|
// increasing float64 measurements once per a measurement collection cycle.
|
|
Float64ObservableCounter(name string, options ...instrument.Float64ObserverOption) (instrument.Float64ObservableCounter, error)
|
|
// Float64ObservableUpDownCounter returns a new instrument identified by
|
|
// name and configured with options. The instrument is used to
|
|
// asynchronously record float64 measurements once per a measurement
|
|
// collection cycle.
|
|
Float64ObservableUpDownCounter(name string, options ...instrument.Float64ObserverOption) (instrument.Float64ObservableUpDownCounter, error)
|
|
// Float64ObservableGauge returns a new instrument identified by name and
|
|
// configured with options. The instrument is used to asynchronously record
|
|
// instantaneous float64 measurements once per a measurement collection
|
|
// cycle.
|
|
Float64ObservableGauge(name string, options ...instrument.Float64ObserverOption) (instrument.Float64ObservableGauge, error)
|
|
|
|
// RegisterCallback registers f to be called during the collection of a
|
|
// measurement cycle.
|
|
//
|
|
// If Unregister of the returned Registration is called, f needs to be
|
|
// unregistered and not called during collection.
|
|
//
|
|
// The instruments f is registered with are the only instruments that f may
|
|
// observe values for.
|
|
//
|
|
// If no instruments are passed, f should not be registered nor called
|
|
// during collection.
|
|
RegisterCallback(f Callback, instruments ...instrument.Asynchronous) (Registration, error)
|
|
}
|
|
|
|
// Callback is a function registered with a Meter that makes observations for
|
|
// the set of instruments it is registered with. The Observer parameter is used
|
|
// to record measurment observations for these instruments.
|
|
//
|
|
// The function needs to complete in a finite amount of time and the deadline
|
|
// of the passed context is expected to be honored.
|
|
//
|
|
// The function needs to make unique observations across all registered
|
|
// Callbacks. Meaning, it should not report measurements for an instrument with
|
|
// the same attributes as another Callback will report.
|
|
//
|
|
// The function needs to be concurrent safe.
|
|
type Callback func(context.Context, Observer) error
|
|
|
|
// Observer records measurements for multiple instruments in a Callback.
|
|
type Observer interface {
|
|
// ObserveFloat64 records the float64 value with attributes for obsrv.
|
|
ObserveFloat64(obsrv instrument.Float64Observable, value float64, attributes ...attribute.KeyValue)
|
|
// ObserveInt64 records the int64 value with attributes for obsrv.
|
|
ObserveInt64(obsrv instrument.Int64Observable, value int64, attributes ...attribute.KeyValue)
|
|
}
|
|
|
|
// Registration is an token representing the unique registration of a callback
|
|
// for a set of instruments with a Meter.
|
|
type Registration interface {
|
|
// Unregister removes the callback registration from a Meter.
|
|
//
|
|
// This method needs to be idempotent and concurrent safe.
|
|
Unregister() error
|
|
}
|