ppkarwasz commented on issue #2844:
URL:
https://github.com/apache/logging-log4j2/issues/2844#issuecomment-2301929799
> I found that the '%X' in the template is invalid.
Yes, `%<something>` pattern converters are not supported in the values of
templates.
You need to use:
* either a [`${...}` property substitution
expression](https://logging.staged.apache.org/log4j/2.x/manual/json-template-layout.html#property-substitution-in-template)
```json
"traceId": "${ctx:x-my-TraceID}"
```
* or the [`pattern`
resolver](https://logging.staged.apache.org/log4j/2.x/manual/json-template-layout.html#event-template-resolver-pattern):
```json
"traceId": {
"$resolver": "pattern",
"pattern": "%X{x-my-TraceID}"
}
```
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