# <a id="bitdrift.public.unary.workflows.v1.RuleStartTracing"></a>RuleStartTracing

**Source definition:** [`src/bitdrift/public/unary/workflows/v1/workflow.proto#L1324-L1330`](<https://github.com/bitdriftlabs/api/blob/main/src/bitdrift/public/unary/workflows/v1/workflow.proto#L1324-L1330>)

A trace-start action.

<section class="proto-fields-table" markdown>
| Field | Type | Description |
|---|---|---|
| match_id | <span class="proto-type proto-type-primitive">string</span><br><em class="proto-field-annotation">between 1 and 100 chars</em> | The match ID that triggers trace sampling for the current session. |

</section>
<p class="h4">Example</p>
```json
{
  "match_id": "_i1yUnHjKfmWpCaD5Tazo"
}
```