wu-sheng commented on a change in pull request #4555: Correlation protocol
implement
URL: https://github.com/apache/skywalking/pull/4555#discussion_r396871715
##########
File path: docs/en/setup/service-agent/java-agent/Application-toolkit-trace.md
##########
@@ -53,3 +53,13 @@ public User methodYouWantToTrace(String param1, String
param2) {
}
```
+* Use `CorrelationContext.set()` API to setting custom data in tracing
context. Please follow [the agent
configuration](README.md#table-of-agent-configuration-properties) to get more
setting limit.
+```java
+optional<String> previous = CorrelationContext.set("customKey", "customValue");
+```
+
+* Use `CorrelationContext.get()` API to get custom data.
+```java
+optional<String> value = CorrelationContext.get("customKey");
+```
+
Review comment:
```suggestion
CorrelationContext configuration descriptions could be found in the [the
agent configuration](README.md#table-of-agent-configuration-properties)
documentation, with `correlation.` as the prefix.
```
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