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</li></ul></nav></div></div></aside><main class="docMainContainer_TBSr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_z5aJ"><div class="docItemContainer_c0TR"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" aria-hidden="true" focusable="false" role="presentation" class="breadcrumbHomeIcon_xK9p"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Develop</span></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Observability</span></li><li class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link">Traces</span></li></ul></nav><div class="docMetaRow_c2hx"><div class="root_Eutc"><button type="button" class="button_gpNY"><span aria-hidden="true" class="icon_Bm9L"><svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-copy"><rect width="14" height="14" x="8" y="8" rx="2" ry="2"></rect><path d="M4 16c-1.1 0-2-.9-2-2V4c0-1.1.9-2 2-2h10c1.1 0 2 .9 2 2"></path></svg></span><span class="label_LzDG">Copy page</span></button></div><span class="theme-doc-version-badge badge badge--secondary">Version: 1.9.x</span></div><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Traces</h1></header><p>Langflow’s <strong>Traces</strong> feature records detailed execution traces for your flows and components so that you can debug issues, measure latency, and track token usage without relying on external observability services.</p>
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<p>Trace data is stored in the Langflow database in the <code>trace</code> and <code>span</code> tables.
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Trace data is presented in the <strong>Flow Activity</strong> and <strong>Trace Details</strong> pages in the UI, and can be retrieved from the <code>/monitor/traces</code> API endpoint.</p>
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<p>Traces are enabled by default.</p>
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<p>Langflow traces can run alongside supported third-party tracing providers.
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If both are enabled, Langflow stores native traces in the <code>trace</code> and <code>span</code> database tables for the <strong>Trace View</strong>, and also sends tracing data to the configured external provider.</p>
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<p>To disable Langflow native tracing and use only an external tracing provider, set <code>LANGFLOW_NATIVE_TRACING=false</code>.</p>
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<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="what-traces-capture">What traces capture<a href="#what-traces-capture" class="hash-link" aria-label="Direct link to What traces capture" title="Direct link to What traces capture" translate="no"></a></h2>
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<p>The tracer records:</p>
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||
<ul>
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<li class=""><strong>Flow-level traces</strong>: A trace for each flow run, including total runtime and status.</li>
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||
<li class=""><strong>Component spans</strong>: Spans for each component in the flow, including inputs, outputs, latency, and errors.</li>
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<li class=""><strong>LangChain spans</strong>: Deeper spans for chains, tools, retrievers, and LLM calls, including model name and token usage where available.</li>
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</ul>
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||
<p>Each span includes:</p>
|
||
<ul>
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||
<li class=""><strong>Name</strong> and <strong>type</strong> (for example, chain, LLM, tool, retriever)</li>
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||
<li class=""><strong>Start and end time</strong> and <strong>latency (ms)</strong></li>
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||
<li class=""><strong>Inputs and outputs</strong> (serialized)</li>
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||
<li class=""><strong>Error details</strong>, if the span failed</li>
|
||
<li class=""><strong>Attributes</strong> such as token counts and model metadata</li>
|
||
</ul>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="view-traces-in-the-ui">View traces in the UI<a href="#view-traces-in-the-ui" class="hash-link" aria-label="Direct link to View traces in the UI" title="Direct link to View traces in the UI" translate="no"></a></h2>
|
||
<p>To view traces in the Langflow UI, do the following:</p>
|
||
<ol>
|
||
<li class="">Run a flow, such as the Simple Agent starter flow in the <a class="" href="/get-started-quickstart">Quickstart</a>.</li>
|
||
<li class="">Click <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-activity lf-inline-icon" aria-hidden="true" focusable="false" role="presentation"><path d="M22 12h-2.48a2 2 0 0 0-1.93 1.46l-2.35 8.36a.25.25 0 0 1-.48 0L9.24 2.18a.25.25 0 0 0-.48 0l-2.35 8.36A2 2 0 0 1 4.49 12H2"></path></svg> <strong>Traces</strong>.
|
||
The <strong>Flow Activity</strong> page opens.
|
||
Each flow run is displayed as a single trace of all of its spans.
|
||
Flow runs can be sorted further by session ID, status, or time range.
|
||
Optionally, click <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-download lf-inline-icon" aria-hidden="true" focusable="false" role="presentation"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"></path><polyline points="7 10 12 15 17 10"></polyline><line x1="12" x2="12" y1="15" y2="3"></line></svg> <strong>Download</strong> to download a JSON file of that flow's trace to your local machine.</li>
|
||
<li class="">Click a flow run to open the <strong>Trace Details</strong> pane.
|
||
The <strong>Trace Details</strong> pane displays spans for your flow run, including a flow-level span for the entire run, and a span for each component.
|
||
Individual component spans include the component's inputs and outputs, timing, and token usage.</li>
|
||
</ol>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="retrieve-traces-with-the-api">Retrieve traces with the API<a href="#retrieve-traces-with-the-api" class="hash-link" aria-label="Direct link to Retrieve traces with the API" title="Direct link to Retrieve traces with the API" translate="no"></a></h2>
|
||
<p>To programmatically query traces, use the <code>/monitor/traces</code> endpoints.
|
||
For full parameter details and code examples in Python, TypeScript, and curl, see <a class="" href="/api-monitor#get-traces">Monitor endpoints: Get traces</a>.</p>
|
||
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="see-also">See also<a href="#see-also" class="hash-link" aria-label="Direct link to See also" title="Direct link to See also" translate="no"></a></h2>
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<ul>
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<li class=""><a class="" href="/logging">Logs</a></li>
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<li class=""><a class="" href="/api-monitor">Monitor endpoints</a></li>
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</ul></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/logging"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Logs</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/integrations-arize"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Arize</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#what-traces-capture" class="table-of-contents__link toc-highlight">What traces capture</a></li><li><a href="#view-traces-in-the-ui" class="table-of-contents__link toc-highlight">View traces in the UI</a></li><li><a href="#retrieve-traces-with-the-api" class="table-of-contents__link toc-highlight">Retrieve traces with the API</a></li><li><a href="#see-also" class="table-of-contents__link toc-highlight">See also</a></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><div class="footer-links">
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