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55 lines
2.5 KiB
Plaintext
55 lines
2.5 KiB
Plaintext
---
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title: Traces
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slug: /traces
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---
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import Icon from "@site/src/components/icon";
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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Langflow’s **Traces** 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.
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Trace data is stored in the Langflow database in the `trace` and `span` tables.
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Trace data is presented in the **Flow Activity** and **Trace Details** pages in the UI, and can be retrieved from the `/monitor/traces` API endpoint.
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Traces are enabled by default.
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To disable Langflow tracing and use a different tracing provider, set `LANGFLOW_NATIVE_TRACING` to `false`.
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## What traces capture
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The tracer records:
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- **Flow-level traces**: A trace for each flow run, including total runtime and status.
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- **Component spans**: Spans for each component in the flow, including inputs, outputs, latency, and errors.
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- **LangChain spans**: Deeper spans for chains, tools, retrievers, and LLM calls, including model name and token usage where available.
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Each span includes:
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- **Name** and **type** (for example, chain, LLM, tool, retriever)
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- **Start and end time** and **latency (ms)**
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- **Inputs and outputs** (serialized)
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- **Error details**, if the span failed
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- **Attributes** such as token counts and model metadata
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## View traces in the UI
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To view traces in the Langflow UI, do the following:
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1. Run a flow, such as the Simple Agent starter flow in the [Quickstart](/get-started-quickstart).
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2. Click <Icon name="Activity" aria-hidden="true"/> **Traces**.
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The **Flow Activity** page opens.
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Each flow run is displayed as a single trace of all of its spans.
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Flow runs can be sorted further by session ID, status, or time range.
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Optionally, click <Icon name="Download" aria-hidden="true"/> **Download** to download a JSON file of that flow's trace to your local machine.
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3. Click a flow run to open the **Trace Details** pane.
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The **Trace Details** pane displays spans for your flow run, including a flow-level span for the entire run, and a span for each component.
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Individual component spans include the component's inputs and outputs, timing, and token usage.
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## Retrieve traces with the API
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To programmatically query traces, use the `/monitor/traces` endpoints.
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For full parameter details and code examples in Python, TypeScript, and curl, see [Monitor endpoints: Get traces](/api-monitor#get-traces).
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## See also
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- [Logs](/logging)
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- [Monitor endpoints](/api-monitor) |