[GitHub] [apisix] lework commented on a diff in pull request #8871: feat(opentelemetry): add opentelemetry variables

["lework (via GitHub)" <gi...@apache.org>]

lework commented on code in PR #8871:
URL: https://github.com/apache/apisix/pull/8871#discussion_r1127289849


##########
docs/en/latest/plugins/opentelemetry.md:
##########
@@ -89,6 +89,32 @@ plugin_attr:
       max_export_batch_size: 2
 ```
 
+## Variables
+
+The following nginx variables are set by OpenTelemetry:
+
+- `opentelemetry_context_traceparent` -  [W3C trace context](https://www.w3.org/TR/trace-context/#trace-context-http-headers-format), e.g.: `00-0af7651916cd43dd8448eb211c80319c-b9c7c989f97918e1-01`
+- `opentelemetry_trace_id` - Trace Id of the current span
+- `opentelemetry_span_id` -  Span Id of the current span
+
+How to use variables? you have to add it to your configuration file (`conf/config.yaml`):
+
+```yaml title="./conf/config.yaml"
+    nginx_config:
+      http_server_configuration_snippet: |
+        set $opentelemetry_context_traceparent ""

Review Comment:
   Good idea, I added some code



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