<!-- NOTE: THIS FILE IS AUTOGENERATED. DO NOT EDIT BY HAND. -->
<!-- see templates/registry/markdown/attribute_namespace.md.j2 -->

# 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` | ![Experimental](https://img.shields.io/badge/-experimental-blue) |

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

---

`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 | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
| `follows_from` | The parent Span doesn't depend in any way on the result of the child Span | ![Experimental](https://img.shields.io/badge/-experimental-blue) |
