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Add readme with supported flags for log4j 1 appender instrumentation #14704

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laurit merged 1 commit into from
Sep 18, 2025
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Add readme with supported flags for log4j 1 appender instrumentation #14704

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9 changes: 9 additions & 0 deletions instrumentation/log4j/log4j-appender-1.2/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 log attributes `thread.name` and `thread.id`. |
| `otel.instrumentation.log4j-appender.experimental.capture-code-attributes` | Boolean | `false` | Enable the capture of [source code attributes]. Note that capturing source code attributes at logging sites might add a performance overhead. |
| `otel.instrumentation.log4j-appender.experimental.capture-mdc-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