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47 lines
2.4 KiB
Go
47 lines
2.4 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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// Package metric provides an implementation of the OpenTelemetry metrics SDK.
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//
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// See https://opentelemetry.io/docs/concepts/signals/metrics/ for information
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// about the concept of OpenTelemetry metrics and
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// https://opentelemetry.io/docs/concepts/components/ for more information
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// about OpenTelemetry SDKs.
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//
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// The entry point for the metric package is the MeterProvider. It is the
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// object that all API calls use to create Meters, instruments, and ultimately
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// make metric measurements. Also, it is an object that should be used to
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// control the life-cycle (start, flush, and shutdown) of the SDK.
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//
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// A MeterProvider needs to be configured to export the measured data, this is
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// done by configuring it with a Reader implementation (using the WithReader
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// MeterProviderOption). Readers take two forms: ones that push to an endpoint
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// (NewPeriodicReader), and ones that an endpoint pulls from. See
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// [go.opentelemetry.io/otel/exporters] for exporters that can be used as
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// or with these Readers.
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//
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// Each Reader, when registered with the MeterProvider, can be augmented with a
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// View. Views allow users that run OpenTelemetry instrumented code to modify
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// the generated data of that instrumentation.
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//
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// The data generated by a MeterProvider needs to include information about its
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// origin. A MeterProvider needs to be configured with a Resource, using the
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// WithResource MeterProviderOption, to include this information. This Resource
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// should be used to describe the unique runtime environment instrumented code
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// is being run on. That way when multiple instances of the code are collected
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// at a single endpoint their origin is decipherable.
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//
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// To avoid leaking memory, the SDK returns the same instrument for calls to
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// create new instruments with the same Name, Unit, and Description.
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// Importantly, callbacks provided using metric.WithFloat64Callback or
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// metric.WithInt64Callback will only apply for the first instrument created
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// with a given Name, Unit, and Description. Instead, use
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// Meter.RegisterCallback and Registration.Unregister to add and remove
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// callbacks without leaking memory.
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//
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// See [go.opentelemetry.io/otel/metric] for more information about
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// the metric API.
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//
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// See [go.opentelemetry.io/otel/sdk/metric/internal/x] for information about
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// the experimental features.
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package metric // import "go.opentelemetry.io/otel/sdk/metric"
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