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67 lines
2.8 KiB
67 lines
2.8 KiB
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/*
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Package metric provides an implementation of the metrics part of the
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OpenTelemetry API.
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This package is currently in a pre-GA phase. Backwards incompatible changes
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may be introduced in subsequent minor version releases as we work to track the
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evolving OpenTelemetry specification and user feedback.
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Measurements can be made about an operation being performed or the state of a
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system in general. These measurements can be crucial to the reliable operation
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of code and provide valuable insights about the inner workings of a system.
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Measurements are made using instruments provided by this package. The type of
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instrument used will depend on the type of measurement being made and of what
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part of a system is being measured.
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Instruments are categorized as Synchronous or Asynchronous and independently
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as Adding or Grouping. Synchronous instruments are called by the user with a
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Context. Asynchronous instruments are called by the SDK during collection.
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Additive instruments are semantically intended for capturing a sum. Grouping
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instruments are intended for capturing a distribution.
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Additive instruments may be monotonic, in which case they are non-decreasing
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and naturally define a rate.
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The synchronous instrument names are:
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Counter: additive, monotonic
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UpDownCounter: additive
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ValueRecorder: grouping
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and the asynchronous instruments are:
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SumObserver: additive, monotonic
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UpDownSumObserver: additive
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ValueObserver: grouping
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All instruments are provided with support for either float64 or int64 input
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values.
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An instrument is created using a Meter. Additionally, a Meter is used to
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record batches of synchronous measurements or asynchronous observations. A
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Meter is obtained using a MeterProvider. A Meter, like a Tracer, is unique to
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the instrumentation it instruments and must be named and versioned when
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created with a MeterProvider with the name and version of the instrumentation
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library.
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Instrumentation should be designed to accept a MeterProvider from which it can
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create its own unique Meter. Alternatively, the registered global
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MeterProvider from the go.opentelemetry.io/otel package can be used as a
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default.
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*/
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package metric // import "go.opentelemetry.io/otel/metric"
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