opentelemetry-java-instrume.../instrumentation/log4j/log4j-mdc-1.2/javaagent/README.md

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# Settings for the Log4j MDC instrumentation
| System property | Type | Default | Description |
|-------------------------------------------------------|---------|---------------|--------------------------------------------------------------------|
| `otel.instrumentation.common.mdc.resource-attributes` | String | | Comma separated list of resource attributes to expose through MDC. |
| `otel.instrumentation.common.logging.trace-id` | String | `trace_id` | Customize MDC key name for the trace id. |
| `otel.instrumentation.common.logging.span-id` | String | `span_id` | Customize MDC key name for the span id. |
| `otel.instrumentation.common.logging.trace-flags` | String | `trace_flags` | Customize MDC key name for the trace flags. |