# Traefik v3 CLI argument unknown

**URL:** <https://community.traefik.io/t/traefik-v3-cli-argument-unknown/21372>\
**Category:** Traefik v3 (latest)\
**Tags:** cli, tracing\
**Created:** [February 5, 2024, 4:39pm UTC](https://community.traefik.io/t/traefik-v3-cli-argument-unknown/21372 "2024-02-05T16:39:26Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![prutheus](https://sea2.discourse-cdn.com/flex020/user_avatar/community.traefik.io/prutheus/32/8219_2.png) [@prutheus](https://community.traefik.io/u/prutheus)\
**Post date:** [February 5, 2024, 4:39pm UTC](https://community.traefik.io/t/traefik-v3-cli-argument-unknown/21372/1 "2024-02-05T16:39:26Z")

</div>

I want to configure traefik:v3 to expose tracing spans.

```auto
docker run --rm -it traefik:v3.0 [...] --tracing=true --tracing.otlp=true [...]

```

I get, following the [docs](https://doc.traefik.io/traefik/v3.0/observability/tracing/opentelemetry/), following error:

```auto
{"level":"error","error":"command traefik error: failed to decode configuration from flags: field not found, node: otlp","time":"2024-02-05T16:37:14Z","message":"Command error"}

```

What am I doing wrong configuring the otlp connector?

---

<div class="post-metadata">

**Author:** ![ldez](https://sea2.discourse-cdn.com/flex020/user_avatar/community.traefik.io/ldez/32/5_2.png) [@ldez](https://community.traefik.io/u/ldez)\
**Post date:** [February 5, 2024, 6:38pm UTC](https://community.traefik.io/t/traefik-v3-cli-argument-unknown/21372/2 "2024-02-05T18:38:43Z")

</div>

Hello,

it's because the configuration has been changed.  
The PR [10223](https://github.com/traefik/traefik/pull/10223) has been merged the 2024-01-08.  
The latest v3 release (v3.0.0-beta5) has been created in 2023-11-29.

The documentation has been updated by the PR.  
You will have to wait for the next v3 release to be able to use this configuration.

The previous key was `opentelemetry` instead of `otlp`.

Note: v3 is in a beta phase, breaking changes can happen.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex020/uploads/containo/original/2X/b/bd81ebdb578656e76e56ff3cc3eed021d3ba132d.png) [@system](https://community.traefik.io/u/system)\
**Post date:** [February 11, 2024, 1:34pm UTC](https://community.traefik.io/t/traefik-v3-cli-argument-unknown/21372/3 "2024-02-11T13:34:59Z")

</div>

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