opentelemetry-java-instrume.../instrumentation/log4j/log4j-appender-2.17/javaagent/README.md

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# Settings for the Log4j Appender instrumentation
| System property | Type | Default | Description |
| ---------------------------------------------------------------------------------- | ------- | ------- | --------------------------------------------------------------------------------------------------------------------- |
| `otel.instrumentation.log4j-appender.experimental-log-attributes` | Boolean | `false` | Enable the capture of experimental span attributes `thread.name` and `thread.id`. |
| `otel.instrumentation.log4j-appender.experimental.capture-map-message-attributes` | Boolean | `false` | Enable the capture of `MapMessage` attributes. |
| `otel.instrumentation.log4j-appender.experimental.capture-marker-attribute` | Boolean | `false` | Enable the capture of Log4j markers as attributes. |
| `otel.instrumentation.log4j-appender.experimental.capture-context-data-attributes` | String | | Comma separated list of context data attributes to capture. Use the wildcard character `*` to capture all attributes. |
[source code attributes]: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/attributes.md#source-code-attributes