mirror of https://github.com/docker/cli.git
68 lines
2.8 KiB
Go
68 lines
2.8 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 provides an implementation of the metrics part of the
|
||
|
|
OpenTelemetry API.
|
||
|
|
|
||
|
|
This package is currently in a pre-GA phase. Backwards incompatible changes
|
||
|
|
may be introduced in subsequent minor version releases as we work to track the
|
||
|
|
evolving OpenTelemetry specification and user feedback.
|
||
|
|
|
||
|
|
Measurements can be made about an operation being performed or the state of a
|
||
|
|
system in general. These measurements can be crucial to the reliable operation
|
||
|
|
of code and provide valuable insights about the inner workings of a system.
|
||
|
|
|
||
|
|
Measurements are made using instruments provided by this package. The type of
|
||
|
|
instrument used will depend on the type of measurement being made and of what
|
||
|
|
part of a system is being measured.
|
||
|
|
|
||
|
|
Instruments are categorized as Synchronous or Asynchronous and independently
|
||
|
|
as Adding or Grouping. Synchronous instruments are called by the user with a
|
||
|
|
Context. Asynchronous instruments are called by the SDK during collection.
|
||
|
|
Adding instruments are semantically intended for capturing a sum. Grouping
|
||
|
|
instruments are intended for capturing a distribution.
|
||
|
|
|
||
|
|
Adding instruments may be monotonic, in which case they are non-decreasing
|
||
|
|
and naturally define a rate.
|
||
|
|
|
||
|
|
The synchronous instrument names are:
|
||
|
|
|
||
|
|
Counter: adding, monotonic
|
||
|
|
UpDownCounter: adding
|
||
|
|
Histogram: grouping
|
||
|
|
|
||
|
|
and the asynchronous instruments are:
|
||
|
|
|
||
|
|
CounterObserver: adding, monotonic
|
||
|
|
UpDownCounterObserver: adding
|
||
|
|
GaugeObserver: grouping
|
||
|
|
|
||
|
|
All instruments are provided with support for either float64 or int64 input
|
||
|
|
values.
|
||
|
|
|
||
|
|
An instrument is created using a Meter. Additionally, a Meter is used to
|
||
|
|
record batches of synchronous measurements or asynchronous observations. A
|
||
|
|
Meter is obtained using a MeterProvider. A Meter, like a Tracer, is unique to
|
||
|
|
the instrumentation it instruments and must be named and versioned when
|
||
|
|
created with a MeterProvider with the name and version of the instrumentation
|
||
|
|
library.
|
||
|
|
|
||
|
|
Instrumentation should be designed to accept a MeterProvider from which it can
|
||
|
|
create its own unique Meter. Alternatively, the registered global
|
||
|
|
MeterProvider from the go.opentelemetry.io/otel package can be used as a
|
||
|
|
default.
|
||
|
|
*/
|
||
|
|
package metric // import "go.opentelemetry.io/otel/metric"
|