traefik/docs/content/observability/tracing/overview.md

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---
title: "Traefik Tracing Overview"
description: "The Traefik Proxy tracing system allows developers to visualize call flows in their infrastructure. Read the full documentation."
---
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# Tracing
Visualize the Requests Flow
{: .subtitle }
The tracing system allows developers to visualize call flows in their infrastructure.
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Traefik uses [OpenTelemetry](https://opentelemetry.io/ "Link to website of OTel"), an open standard designed for distributed tracing.
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Please check our dedicated [OTel docs](./opentelemetry.md) to learn more.
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## Configuration
To enable the tracing:
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```yaml tab="File (YAML)"
tracing: {}
```
```toml tab="File (TOML)"
[tracing]
```
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```bash tab="CLI"
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--tracing=true
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```
### Common Options
#### `addInternals`
_Optional, Default="false"_
Enables tracing for internal resources.
```yaml tab="File (YAML)"
tracing:
addInternals: true
```
```toml tab="File (TOML)"
[tracing]
addInternals = true
```
```bash tab="CLI"
--tracing.addinternals
```
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#### `serviceName`
_Required, Default="traefik"_
Service name used in selected backend.
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```yaml tab="File (YAML)"
tracing:
serviceName: traefik
```
```toml tab="File (TOML)"
[tracing]
serviceName = "traefik"
```
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```bash tab="CLI"
--tracing.serviceName=traefik
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```
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#### `sampleRate`
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_Optional, Default=1.0_
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The proportion of requests to trace, specified between 0.0 and 1.0.
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```yaml tab="File (YAML)"
tracing:
sampleRate: 0.2
```
```toml tab="File (TOML)"
[tracing]
sampleRate = 0.2
```
```bash tab="CLI"
--tracing.sampleRate=0.2
```
#### `globalAttributes`
_Optional, Default=empty_
Applies a list of shared key:value attributes on all spans.
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```yaml tab="File (YAML)"
tracing:
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globalAttributes:
attr1: foo
attr2: bar
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```
```toml tab="File (TOML)"
[tracing]
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[tracing.globalAttributes]
attr1 = "foo"
attr2 = "bar"
```
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```bash tab="CLI"
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--tracing.globalAttributes.attr1=foo
--tracing.globalAttributes.attr2=bar
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```
#### `capturedRequestHeaders`
_Optional, Default=empty_
Defines the list of request headers to add as attributes.
It applies to client and server kind spans.
```yaml tab="File (YAML)"
tracing:
capturedRequestHeaders:
- X-CustomHeader
```
```toml tab="File (TOML)"
[tracing]
capturedRequestHeaders = ["X-CustomHeader"]
```
```bash tab="CLI"
--tracing.capturedRequestHeaders[0]=X-CustomHeader
```
#### `capturedResponseHeaders`
_Optional, Default=empty_
Defines the list of response headers to add as attributes.
It applies to client and server kind spans.
```yaml tab="File (YAML)"
tracing:
capturedResponseHeaders:
- X-CustomHeader
```
```toml tab="File (TOML)"
[tracing]
capturedResponseHeaders = ["X-CustomHeader"]
```
```bash tab="CLI"
--tracing.capturedResponseHeaders[0]=X-CustomHeader
```