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60 lines
3 KiB
Go
60 lines
3 KiB
Go
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// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package trace // import "go.opentelemetry.io/otel/trace"
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import "go.opentelemetry.io/otel/trace/embedded"
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// TracerProvider provides Tracers that are used by instrumentation code to
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// trace computational workflows.
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//
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// A TracerProvider is the collection destination of all Spans from Tracers it
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// provides, it represents a unique telemetry collection pipeline. How that
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// pipeline is defined, meaning how those Spans are collected, processed, and
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// where they are exported, depends on its implementation. Instrumentation
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// authors do not need to define this implementation, rather just use the
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// provided Tracers to instrument code.
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//
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// Commonly, instrumentation code will accept a TracerProvider implementation
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// at runtime from its users or it can simply use the globally registered one
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// (see https://pkg.go.dev/go.opentelemetry.io/otel#GetTracerProvider).
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//
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// Warning: Methods may be added to this interface in minor releases. See
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// package documentation on API implementation for information on how to set
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// default behavior for unimplemented methods.
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type TracerProvider interface {
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// Users of the interface can ignore this. This embedded type is only used
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// by implementations of this interface. See the "API Implementations"
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// section of the package documentation for more information.
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embedded.TracerProvider
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// Tracer returns a unique Tracer scoped to be used by instrumentation code
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// to trace computational workflows. The scope and identity of that
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// instrumentation code is uniquely defined by the name and options passed.
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//
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// The passed name needs to uniquely identify instrumentation code.
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// Therefore, it is recommended that name is the Go package name of the
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// library providing instrumentation (note: not the code being
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// instrumented). Instrumentation libraries can have multiple versions,
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// therefore, the WithInstrumentationVersion option should be used to
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// distinguish these different codebases. Additionally, instrumentation
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// libraries may sometimes use traces to communicate different domains of
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// workflow data (i.e. using spans to communicate workflow events only). If
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// this is the case, the WithScopeAttributes option should be used to
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// uniquely identify Tracers that handle the different domains of workflow
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// data.
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//
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// If the same name and options are passed multiple times, the same Tracer
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// will be returned (it is up to the implementation if this will be the
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// same underlying instance of that Tracer or not). It is not necessary to
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// call this multiple times with the same name and options to get an
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// up-to-date Tracer. All implementations will ensure any TracerProvider
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// configuration changes are propagated to all provided Tracers.
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//
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// If name is empty, then an implementation defined default name will be
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// used instead.
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//
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// This method is safe to call concurrently.
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Tracer(name string, options ...TracerOption) Tracer
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}
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