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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/api-logs | 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_api-logs.html">@opentelemetry/api-logs</a></li></ul><h1>Module @opentelemetry/api-logs</h1></div><section class="tsd-panel tsd-typography"><a id="opentelemetry-logs-bridge-api-for-javascript" class="tsd-anchor"></a><h1 class="tsd-anchor-link">OpenTelemetry Logs Bridge API for JavaScript<a href="#opentelemetry-logs-bridge-api-for-javascript" 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/api-logs"><img src="https://badge.fury.io/js/%40opentelemetry%2Fapi-logs.svg" alt="NPM Published Version"></a>
<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>
<p><strong>Note: This is an experimental package under active development. New releases may include breaking changes.</strong></p>
<p>This package provides everything needed to interact with the unstable OpenTelemetry Logs Bridge API, including all TypeScript interfaces, enums, and no-op implementations. It is intended for use both on the server and in the browser.</p>
<p><strong>Note: This module defines a log backend API. The API is not intended to be called by application developers directly.
It is provided for logging library authors to build log appenders, which use this API to bridge between existing
logging libraries and the OpenTelemetry log data model.</strong></p>
<a id="alpha-software---use-at-your-own-risk" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Alpha Software - Use at your own risk<a href="#alpha-software---use-at-your-own-risk" 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>The Logs Bridge API is considered alpha software and there is no guarantee of stability or long-term support. When the API is stabilized, it will be made available and supported long-term in the <code>@opentelemetry/api</code> package and this package will be deprecated.</p>
<a id="quick-start" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Quick Start<a href="#quick-start" 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>Purposefully left blank until SDK is available.</p>
<a id="version-compatibility" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Version Compatibility<a href="#version-compatibility" 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>Because the npm installer and node module resolution algorithm could potentially allow two or more copies of any given package to exist within the same <code>node_modules</code> structure, the OpenTelemetry API takes advantage of a variable on the <code>global</code> object to store the global API. When an API method in the API package is called, it checks if this <code>global</code> API exists and proxies calls to it if and only if it is a compatible API version. This means if a package has a dependency on an OpenTelemetry API version which is not compatible with the API used by the end user, the package will receive a no-op implementation of the API.</p>
<a id="advanced-use" class="tsd-anchor"></a><h2 class="tsd-anchor-link">Advanced Use<a href="#advanced-use" 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><a id="api-methods" class="tsd-anchor"></a><h3 class="tsd-anchor-link">API Methods<a href="#api-methods" 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>If you are writing an instrumentation library, or prefer to call the API methods directly rather than using the <code>register</code> method on the Tracer/Meter/Logger Provider, OpenTelemetry provides direct access to the underlying API methods through the <code>@opentelemetry/api-logs</code> package. API entry points are defined as global singleton objects <code>trace</code>, <code>metrics</code>, <code>logs</code>, <code>propagation</code>, and <code>context</code> which contain methods used to initialize SDK implementations and acquire resources from the API.</p>
<ul>
<li><a href="https://open-telemetry.github.io/opentelemetry-js/modules/_opentelemetry_api_logs.html">Logs API Documentation</a></li>
</ul>
<pre><code class="javascript"><span class="hl-3">const</span><span class="hl-1"> </span><span class="hl-4">api</span><span class="hl-1"> = </span><span class="hl-0">require</span><span class="hl-1">(</span><span class="hl-2">&quot;@opentelemetry/api-logs&quot;</span><span class="hl-1">);</span><br/><br/><span class="hl-5">/* A specific implementation of LoggerProvider comes from an SDK */</span><br/><span class="hl-3">const</span><span class="hl-1"> </span><span class="hl-4">loggerProvider</span><span class="hl-1"> = </span><span class="hl-0">createLoggerProvider</span><span class="hl-1">();</span><br/><br/><span class="hl-5">/* Initialize LoggerProvider */</span><br/><span class="hl-6">api</span><span class="hl-1">.</span><span class="hl-6">logs</span><span class="hl-1">.</span><span class="hl-0">setGlobalLoggerProvider</span><span class="hl-1">(</span><span class="hl-6">loggerProvider</span><span class="hl-1">);</span><br/><span class="hl-5">/* returns loggerProvider (no-op if a working provider has not been initialized) */</span><br/><span class="hl-6">api</span><span class="hl-1">.</span><span class="hl-6">logs</span><span class="hl-1">.</span><span class="hl-0">getLoggerProvider</span><span class="hl-1">();</span><br/><span class="hl-5">/* returns a logger from the registered global logger provider (no-op if a working provider has not been initialized) */</span><br/><span class="hl-3">const</span><span class="hl-1"> </span><span class="hl-4">logger</span><span class="hl-1"> = </span><span class="hl-6">api</span><span class="hl-1">.</span><span class="hl-6">logs</span><span class="hl-1">.</span><span class="hl-0">getLogger</span><span class="hl-1">(</span><span class="hl-6">name</span><span class="hl-1">, </span><span class="hl-6">version</span><span class="hl-1">);</span><br/><br/><span class="hl-5">// logging a log record in a log appender</span><br/><span class="hl-6">logger</span><span class="hl-1">.</span><span class="hl-0">emit</span><span class="hl-1">({ </span><span class="hl-6">severityNumber:</span><span class="hl-1"> </span><span class="hl-6">SeverityNumber</span><span class="hl-1">.</span><span class="hl-4">TRACE</span><span class="hl-1">, </span><span class="hl-6">body:</span><span class="hl-1"> </span><span class="hl-2">&#39;log data&#39;</span><span class="hl-1"> });</span>
</code><button type="button">Copy</button></pre>
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<li>For more information on OpenTelemetry, visit: <a href="https://opentelemetry.io/">https://opentelemetry.io/</a></li>
<li>For more about OpenTelemetry JavaScript: <a href="https://github.com/open-telemetry/opentelemetry-js">https://github.com/open-telemetry/opentelemetry-js</a></li>
<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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