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<!DOCTYPE html><html class="default" lang="en" data-base=".."><head><meta charset="utf-8"/><meta http-equiv="x-ua-compatible" content="IE=edge"/><title>@opentelemetry/sdk-trace-base | OpenTelemetry SDK</title><meta name="description" content="Documentation for OpenTelemetry SDK"/><meta name="viewport" content="width=device-width, initial-scale=1"/><link rel="stylesheet" href="../assets/style.css"/><link rel="stylesheet" href="../assets/highlight.css"/><script defer src="../assets/main.js"></script><script async src="../assets/icons.js" id="tsd-icons-script"></script><script async src="../assets/search.js" id="tsd-search-script"></script><script async src="../assets/navigation.js" id="tsd-nav-script"></script><script async src="../assets/hierarchy.js" id="tsd-hierarchy-script"></script></head><body><script>document.documentElement.dataset.theme = localStorage.getItem("tsd-theme") || "os";document.body.style.display="none";setTimeout(() => app?app.showPage():document.body.style.removeProperty("display"),500)</script><header class="tsd-page-toolbar"><div class="tsd-toolbar-contents container"><div class="table-cell" id="tsd-search"><div class="field"><label for="tsd-search-field" class="tsd-widget tsd-toolbar-icon search no-caption"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-search"></use></svg></label><input type="text" id="tsd-search-field" aria-label="Search"/></div><div class="field"><div id="tsd-toolbar-links"></div></div><ul class="results"><li class="state loading">Preparing search index...</li><li class="state failure">The search index is not available</li></ul><a href="../index.html" class="title">OpenTelemetry SDK</a></div><div class="table-cell" id="tsd-widgets"><a href="#" class="tsd-widget tsd-toolbar-icon menu no-caption" data-toggle="menu" aria-label="Menu"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-menu"></use></svg></a></div></div></header><div class="container container-main"><div class="col-content"><div class="tsd-page-title"><ul class="tsd-breadcrumb"><li><a href="../index.html">OpenTelemetry SDK</a></li><li><a href="_opentelemetry_sdk-trace-base.html">@opentelemetry/sdk-trace-base</a></li></ul><h1>Module @opentelemetry/sdk-trace-base</h1></div><section class="tsd-panel tsd-typography"><a id="opentelemetry-tracing-sdk" class="tsd-anchor"></a><h1 class="tsd-anchor-link">OpenTelemetry Tracing SDK<a href="#opentelemetry-tracing-sdk" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h1><p><a href="https://www.npmjs.com/package/@opentelemetry/sdk-trace-base"><img src="https://badge.fury.io/js/%40opentelemetry%2Fsdk-trace-base.svg" alt="NPM Published Version"></a>
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<a href="https://img.shields.io/badge/license-Apache_2.0-green.svg?style=flat"><img src="https://img.shields.io/badge/license-Apache_2.0-green.svg?style=flat" alt="Apache License"></a></p>
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<p>The <code>tracing</code> module contains the foundation for all tracing SDKs of <a href="https://github.com/open-telemetry/opentelemetry-js">opentelemetry-js</a>.</p>
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<p>Used standalone, this module provides methods for manual instrumentation of code, offering full control over span creation for client-side JavaScript (browser) and Node.js.</p>
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<p>It does <strong>not</strong> provide automated instrumentation of known libraries, context propagation or distributed-context out-of-the-box.</p>
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<p>For a <code>TracerProvider</code> that includes default context management and propagation for Node.js, please see
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<a href="https://github.com/open-telemetry/opentelemetry-js/tree/main/packages/opentelemetry-sdk-trace-node">@opentelemetry/sdk-trace-node</a>.</p>
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<p>For a <code>TracerProvider</code> that includes default context management and propagation for Browser, please see
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<a href="https://github.com/open-telemetry/opentelemetry-js/tree/main/packages/opentelemetry-sdk-trace-web">@opentelemetry/sdk-trace-web</a>.</p>
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<a id="installation" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Installation<a href="#installation" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><pre><code class="bash"><span class="hl-0">npm</span><span class="hl-1"> </span><span class="hl-2">install</span><span class="hl-1"> </span><span class="hl-3">--save</span><span class="hl-1"> </span><span class="hl-2">@opentelemetry/api</span><br/><span class="hl-0">npm</span><span class="hl-1"> </span><span class="hl-2">install</span><span class="hl-1"> </span><span class="hl-3">--save</span><span class="hl-1"> </span><span class="hl-2">@opentelemetry/sdk-trace-base</span>
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</code><button type="button">Copy</button></pre>
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<a id="usage" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Usage<a href="#usage" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><pre><code class="js"><span class="hl-3">const</span><span class="hl-1"> { </span><span class="hl-4">trace</span><span class="hl-1"> } = </span><span class="hl-0">require</span><span class="hl-1">(</span><span class="hl-2">'@opentelemetry/api'</span><span class="hl-1">);</span><br/><span class="hl-3">const</span><span class="hl-1"> { </span><span class="hl-4">BasicTracerProvider</span><span class="hl-1"> } = </span><span class="hl-0">require</span><span class="hl-1">(</span><span class="hl-2">'@opentelemetry/sdk-trace-base'</span><span class="hl-1">);</span><br/><br/><span class="hl-5">// To start a trace, you first need to initialize the Tracer provider.</span><br/><span class="hl-5">// NOTE: The default OpenTelemetry tracer provider does not record any tracing information.</span><br/><span class="hl-5">// Registering a working tracer provider allows the API methods to record traces.</span><br/><span class="hl-6">trace</span><span class="hl-1">.</span><span class="hl-0">setGlobalTracerProvider</span><span class="hl-1">(</span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">BasicTracerProvider</span><span class="hl-1">());</span><br/><br/><span class="hl-5">// Important: requires a context manager and propagator to be registered manually.</span><br/><span class="hl-5">// propagation.setGlobalPropagator(propagator); // replace `propagator` with your `TextMapPropagator`, for example: `W3CTraceContextPropagator` from `@openetelemetry/core`</span><br/><span class="hl-5">// context.setGlobalContextManager(contextManager); // replace `contextManager` with your `ContextManager`: `AsyncLocalStorageContextManager` from `@openetelemetry/async-hooks`</span><br/><br/><span class="hl-5">// To create a span in a trace, we used the global singleton tracer to start a new span.</span><br/><span class="hl-3">const</span><span class="hl-1"> </span><span class="hl-4">span</span><span class="hl-1"> = </span><span class="hl-6">trace</span><span class="hl-1">.</span><span class="hl-0">getTracer</span><span class="hl-1">(</span><span class="hl-2">'default'</span><span class="hl-1">).</span><span class="hl-0">startSpan</span><span class="hl-1">(</span><span class="hl-2">'foo'</span><span class="hl-1">);</span><br/><br/><span class="hl-5">// Set a span attribute</span><br/><span class="hl-6">span</span><span class="hl-1">.</span><span class="hl-0">setAttribute</span><span class="hl-1">(</span><span class="hl-2">'key'</span><span class="hl-1">, </span><span class="hl-2">'value'</span><span class="hl-1">);</span><br/><br/><span class="hl-5">// We must end the spans so they become available for exporting.</span><br/><span class="hl-6">span</span><span class="hl-1">.</span><span class="hl-0">end</span><span class="hl-1">();</span>
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</code><button type="button">Copy</button></pre>
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<a id="config" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Config<a href="#config" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>Tracing configuration is a merge of user supplied configuration with both the default
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configuration as specified in <a href="../media/config-1.ts">config.ts</a> and an
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environmentally configurable sampling (via <code>OTEL_TRACES_SAMPLER</code> and <code>OTEL_TRACES_SAMPLER_ARG</code>).</p>
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<a id="built-in-samplers" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Built-in Samplers<a href="#built-in-samplers" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>Sampler is used to make decisions on <code>Span</code> sampling.</p>
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<a id="alwayson-sampler" class="tsd-anchor"></a><h3 class="tsd-anchor-link">AlwaysOn Sampler<a href="#alwayson-sampler" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>Samples every trace regardless of upstream sampling decisions.</p>
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<blockquote>
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<p>This is used as a default Sampler</p>
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</blockquote>
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<pre><code class="js"><span class="hl-3">const</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-4">AlwaysOnSampler</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">BasicTracerProvider</span><span class="hl-1">,</span><br/><span class="hl-1">} = </span><span class="hl-0">require</span><span class="hl-1">(</span><span class="hl-2">"@opentelemetry/sdk-trace-base"</span><span class="hl-1">);</span><br/><br/><span class="hl-3">const</span><span class="hl-1"> </span><span class="hl-4">tracerProvider</span><span class="hl-1"> = </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">BasicTracerProvider</span><span class="hl-1">({</span><br/><span class="hl-1"> </span><span class="hl-6">sampler:</span><span class="hl-1"> </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">AlwaysOnSampler</span><span class="hl-1">()</span><br/><span class="hl-1">});</span>
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</code><button type="button">Copy</button></pre>
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<a id="alwaysoff-sampler" class="tsd-anchor"></a><h3 class="tsd-anchor-link">AlwaysOff Sampler<a href="#alwaysoff-sampler" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>Doesn't sample any trace, regardless of upstream sampling decisions.</p>
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<pre><code class="js"><span class="hl-3">const</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-4">AlwaysOffSampler</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">BasicTracerProvider</span><span class="hl-1">,</span><br/><span class="hl-1">} = </span><span class="hl-0">require</span><span class="hl-1">(</span><span class="hl-2">"@opentelemetry/sdk-trace-base"</span><span class="hl-1">);</span><br/><br/><span class="hl-3">const</span><span class="hl-1"> </span><span class="hl-4">tracerProvider</span><span class="hl-1"> = </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">BasicTracerProvider</span><span class="hl-1">({</span><br/><span class="hl-1"> </span><span class="hl-6">sampler:</span><span class="hl-1"> </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">AlwaysOffSampler</span><span class="hl-1">()</span><br/><span class="hl-1">});</span>
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</code><button type="button">Copy</button></pre>
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<a id="traceidratiobased-sampler" class="tsd-anchor"></a><h3 class="tsd-anchor-link">TraceIdRatioBased Sampler<a href="#traceidratiobased-sampler" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>Samples some percentage of traces, calculated deterministically using the trace ID.
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Any trace that would be sampled at a given percentage will also be sampled at any higher percentage.</p>
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<p>The <code>TraceIDRatioSampler</code> may be used with the <code>ParentBasedSampler</code> to respect the sampled flag of an incoming trace.</p>
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<pre><code class="js"><span class="hl-3">const</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-4">BasicTracerProvider</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">TraceIdRatioBasedSampler</span><span class="hl-1">,</span><br/><span class="hl-1">} = </span><span class="hl-0">require</span><span class="hl-1">(</span><span class="hl-2">"@opentelemetry/sdk-trace-base"</span><span class="hl-1">);</span><br/><br/><span class="hl-3">const</span><span class="hl-1"> </span><span class="hl-4">tracerProvider</span><span class="hl-1"> = </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">BasicTracerProvider</span><span class="hl-1">({</span><br/><span class="hl-1"> </span><span class="hl-5">// See details of ParentBasedSampler below</span><br/><span class="hl-1"> </span><span class="hl-6">sampler:</span><span class="hl-1"> </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">ParentBasedSampler</span><span class="hl-1">({</span><br/><span class="hl-1"> </span><span class="hl-5">// Trace ID Ratio Sampler accepts a positional argument</span><br/><span class="hl-1"> </span><span class="hl-5">// which represents the percentage of traces which should</span><br/><span class="hl-1"> </span><span class="hl-5">// be sampled.</span><br/><span class="hl-1"> </span><span class="hl-6">root:</span><span class="hl-1"> </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">TraceIdRatioBasedSampler</span><span class="hl-1">(</span><span class="hl-9">0.5</span><span class="hl-1">)</span><br/><span class="hl-1"> });</span><br/><span class="hl-1">});</span>
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</code><button type="button">Copy</button></pre>
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<a id="parentbased-sampler" class="tsd-anchor"></a><h3 class="tsd-anchor-link">ParentBased Sampler<a href="#parentbased-sampler" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul>
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<li>This is a composite sampler. <code>ParentBased</code> helps distinguished between the
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following cases:
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<ul>
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<li>No parent (root span).</li>
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<li>Remote parent with <code>sampled</code> flag <code>true</code></li>
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<li>Remote parent with <code>sampled</code> flag <code>false</code></li>
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<li>Local parent with <code>sampled</code> flag <code>true</code></li>
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<li>Local parent with <code>sampled</code> flag <code>false</code></li>
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</ul>
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</li>
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</ul>
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<p>Required parameters:</p>
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<ul>
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<li><code>root(Sampler)</code> - Sampler called for spans with no parent (root spans)</li>
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</ul>
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<p>Optional parameters:</p>
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<ul>
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<li><code>remoteParentSampled(Sampler)</code> (default: <code>AlwaysOn</code>)</li>
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<li><code>remoteParentNotSampled(Sampler)</code> (default: <code>AlwaysOff</code>)</li>
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<li><code>localParentSampled(Sampler)</code> (default: <code>AlwaysOn</code>)</li>
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<li><code>localParentNotSampled(Sampler)</code> (default: <code>AlwaysOff</code>)</li>
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</ul>
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<table>
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<thead>
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<tr>
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<th>Parent</th>
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<th>parent.isRemote()</th>
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<th>parent.isSampled()</th>
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<th>Invoke sampler</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>absent</td>
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<td>n/a</td>
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<td>n/a</td>
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<td><code>root()</code></td>
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</tr>
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<tr>
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<td>present</td>
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<td>true</td>
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<td>true</td>
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<td><code>remoteParentSampled()</code></td>
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</tr>
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<tr>
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<td>present</td>
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<td>true</td>
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<td>false</td>
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<td><code>remoteParentNotSampled()</code></td>
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</tr>
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<tr>
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<td>present</td>
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<td>false</td>
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<td>true</td>
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<td><code>localParentSampled()</code></td>
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</tr>
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<tr>
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<td>present</td>
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<td>false</td>
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<td>false</td>
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<td><code>localParentNotSampled()</code></td>
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</tr>
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</tbody>
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</table>
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<pre><code class="js"><span class="hl-3">const</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-4">AlwaysOffSampler</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">BasicTracerProvider</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">ParentBasedSampler</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">TraceIdRatioBasedSampler</span><span class="hl-1">,</span><br/><span class="hl-1">} = </span><span class="hl-0">require</span><span class="hl-1">(</span><span class="hl-2">"@opentelemetry/sdk-trace-base"</span><span class="hl-1">);</span><br/><br/><span class="hl-3">const</span><span class="hl-1"> </span><span class="hl-4">tracerProvider</span><span class="hl-1"> = </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">BasicTracerProvider</span><span class="hl-1">({</span><br/><span class="hl-1"> </span><span class="hl-6">sampler:</span><span class="hl-1"> </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">ParentBasedSampler</span><span class="hl-1">({</span><br/><span class="hl-1"> </span><span class="hl-5">// By default, the ParentBasedSampler will respect the parent span's sampling</span><br/><span class="hl-1"> </span><span class="hl-5">// decision. This is configurable by providing a different sampler to use</span><br/><span class="hl-1"> </span><span class="hl-5">// based on the situation. See configuration details above.</span><br/><span class="hl-1"> </span><span class="hl-5">//</span><br/><span class="hl-1"> </span><span class="hl-5">// This will delegate the sampling decision of all root traces (no parent)</span><br/><span class="hl-1"> </span><span class="hl-5">// to the TraceIdRatioBasedSampler.</span><br/><span class="hl-1"> </span><span class="hl-5">// See details of TraceIdRatioBasedSampler above.</span><br/><span class="hl-1"> </span><span class="hl-6">root:</span><span class="hl-1"> </span><span class="hl-3">new</span><span class="hl-1"> </span><span class="hl-0">TraceIdRatioBasedSampler</span><span class="hl-1">(</span><span class="hl-9">0.5</span><span class="hl-1">)</span><br/><span class="hl-1"> })</span><br/><span class="hl-1">});</span>
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</code><button type="button">Copy</button></pre>
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<a id="example" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Example<a href="#example" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>See <a href="https://github.com/open-telemetry/opentelemetry-js/tree/main/examples/basic-tracer-node">examples/basic-tracer-node</a> for an end-to-end example, including exporting created spans.</p>
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<a id="useful-links" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Useful links<a href="#useful-links" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><ul>
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<li>For more information on OpenTelemetry, visit: <a href="https://opentelemetry.io/">https://opentelemetry.io/</a></li>
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<li>For more about OpenTelemetry JavaScript: <a href="https://github.com/open-telemetry/opentelemetry-js">https://github.com/open-telemetry/opentelemetry-js</a></li>
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<li>For help or feedback on this project, join us in <a href="https://github.com/open-telemetry/opentelemetry-js/discussions">GitHub Discussions</a></li>
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</ul>
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<a id="license" class="tsd-anchor"></a><h2 class="tsd-anchor-link">License<a href="#license" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>Apache 2.0 - See <a href="https://github.com/open-telemetry/opentelemetry-js/blob/main/LICENSE">LICENSE</a> for more information.</p>
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</section><details class="tsd-panel-group tsd-member-group tsd-accordion" open><summary class="tsd-accordion-summary" data-key="section-Enumerations"><h2><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg> Enumerations</h2></summary><dl class="tsd-member-summaries"><dt class="tsd-member-summary"><a id="samplingdecision" class="tsd-anchor"></a><span class="tsd-member-summary-name"><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Enumeration"><use href="../assets/icons.svg#icon-8"></use></svg><a href="../enums/_opentelemetry_sdk-trace-base.SamplingDecision.html">SamplingDecision</a><a href="#samplingdecision" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></span></dt><dd class="tsd-member-summary"></dd></dl></details><details class="tsd-panel-group tsd-member-group tsd-accordion" 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SDK</span></a><ul><li><a href="#installation"><span>Installation</span></a></li><li><a href="#usage"><span>Usage</span></a></li><li><a href="#config"><span>Config</span></a></li><li><a href="#built-in-samplers"><span>Built-<wbr/>in <wbr/>Samplers</span></a></li><li><ul><li><a href="#alwayson-sampler"><span>Always<wbr/>On <wbr/>Sampler</span></a></li><li><a href="#alwaysoff-sampler"><span>Always<wbr/>Off <wbr/>Sampler</span></a></li><li><a href="#traceidratiobased-sampler"><span>Trace<wbr/>Id<wbr/>Ratio<wbr/>Based <wbr/>Sampler</span></a></li><li><a href="#parentbased-sampler"><span>Parent<wbr/>Based <wbr/>Sampler</span></a></li></ul></li><li><a href="#example"><span>Example</span></a></li><li><a href="#useful-links"><span>Useful links</span></a></li><li><a href="#license"><span>License</span></a></li></ul><details open class="tsd-accordion tsd-page-navigation-section"><summary class="tsd-accordion-summary" data-key="section-Enumerations"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg>Enumerations</summary><div><a href="#samplingdecision" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Enumeration"><use href="../assets/icons.svg#icon-8"></use></svg><span>Sampling<wbr/>Decision</span></a></div></details><details open class="tsd-accordion tsd-page-navigation-section"><summary class="tsd-accordion-summary" data-key="section-Classes"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-chevronDown"></use></svg>Classes</summary><div><a href="#alwaysoffsampler" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Class"><use href="../assets/icons.svg#icon-128"></use></svg><span>Always<wbr/>Off<wbr/>Sampler</span></a><a href="#alwaysonsampler" class=""><svg class="tsd-kind-icon" viewBox="0 0 24 24" aria-label="Class"><use 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