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[DOCS-10557] Add details about trace ID #31155

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Aug 19, 2025
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[DOCS-10557] Add details about trace ID #31155

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14 changes: 12 additions & 2 deletions content/en/real_user_monitoring/correlate_with_other_telemetry/apm/_index.md
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Expand Up @@ -672,13 +672,23 @@ Datadog uses the distributed tracing protocol and sets up the HTTP headers below
: `parent id`: 64 bits span ID, hexadecimal on 16 characters.
: `trace flags`: Sampled (`01`) or not sampled (`00`)

**Trace ID Conversion**: The 128-bit W3C trace ID is created by padding the original 64-bit source trace ID with leading zeros. This ensures compatibility with APM while conforming to the W3C Trace Context specification. The original 64-bit trace ID becomes the lower 64 bits of the 128-bit W3C trace ID.

`tracestate: dd=s:[sampling priority];o:[origin]`
: `dd`: Datadog's vendor prefix.
: `sampling priority`: Set to `1` if the trace was sampled, or `0` if it was not.
: `origin`: Always set to `rum` to make sure the generated traces from Real User Monitoring don't affect your APM Index Spans counts.

Example:
: `traceparent: 00-00000000000000008448eb211c80319c-b7ad6b7169203331s-01`
**Examples**:

Source trace ID (64-bit): `8448eb211c80319c`

W3C Trace Context (128-bit): `00000000000000008448eb211c80319c`

The relationship shows that the original 64-bit trace ID `8448eb211c80319c` is padded with 16 leading zeros (`0000000000000000`) to create the 128-bit W3C trace ID.

Complete traceparent example:
: `traceparent: 00-00000000000000008448eb211c80319c-b7ad6b7169203331-01`
: `tracestate: dd=s:1;o:rum`

{{% /tab %}}
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