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[MLOB-7336] Document automatic user/session tagging from RUM baggage #36240

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[MLOB-7336] Document automatic user/session tagging from RUM baggage #36240

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14 changes: 14 additions & 0 deletions content/en/llm_observability/instrumentation/sdk.md
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### Automatic tagging from RUM baggage

When the [RUM Browser SDK][11] has `propagateTraceBaggage` enabled, it injects OTel baggage (`session.id`, `user.id`, `account.id`) on outbound HTTP requests. The Python and Node.js LLMObs SDKs automatically read these baggage values from the active trace context and apply them to LLMObs spans using Datadog standard attribute names:

Check notice on line 2511 in content/en/llm_observability/instrumentation/sdk.md

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Datadog.sentencelength 

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| OTel baggage key | LLMObs span tag |
|---|---|
| `session.id` | `session_id` |
| `user.id` | `usr.id` |
| `account.id` | `usr.account_id` |

This links every LLMObs trace back to the originating RUM session and user without any manual tagging. Explicit values set through `LLMObs.annotate()` (or `session_id` on the root span decorator) take precedence over baggage-derived values.

[11]: /real_user_monitoring/browser/

## Distributed tracing

The SDK supports tracing across distributed services or hosts. Distributed tracing works by propagating span information across web requests.
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