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# OpenTracing

## OpenTracing Attributes

Attributes used by the OpenTracing Shim layer.

| Attribute | Type | Description | Examples | Stability |
|---|---|---|---|---|
| <a id="opentracing-ref-type" href="#opentracing-ref-type">`opentracing.ref_type`</a> | string | Parent-child Reference type [1] | `child_of`; `follows_from` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `opentracing.ref_type`:** The causal relationship between a child Span and a parent Span.

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`opentracing.ref_type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

| Value  | Description | Stability |
|---|---|---|
| `child_of` | The parent Span depends on the child Span in some capacity | ![Development](https://img.shields.io/badge/-development-blue) |
| `follows_from` | The parent Span doesn't depend in any way on the result of the child Span | ![Development](https://img.shields.io/badge/-development-blue) |
