This documentation has an index for AI agents at /llms.txt. A Markdown version of this page is available at https://explorer.opentelemetry.io/java-agent/instrumentation/log4j-mdc-1.2.md.

Log4j

OpenTelemetry Java agent instrumentation

This instrumentation adds trace context (trace ID, span ID, and trace flags) to the Log4j MDC, it does not emit any telemetry on its own.

Name: log4j-mdc-1.2
Scope: io.opentelemetry.log4j-mdc-1.2
Target versions: log4j:log4j:[1.2,)
Library: https://logging.apache.org/log4j/1.2/

Configuration

Option	Type	Default	Description
`otel.instrumentation.common.logging.span-id-key`	string	span_id	Specifies the key name used to store the span ID in the logging context.
`otel.instrumentation.common.logging.trace-flags-key`	string	trace_flags	Specifies the key name used to store the trace flags in the logging context.
`otel.instrumentation.common.logging.trace-id-key`	string	trace_id	Specifies the key name used to store the trace ID in the logging context.
`otel.instrumentation.common.mdc.resource-attributes`	list		Specifies which resource attributes to add to the logging context as a comma-separated list of attribute keys.

Data

JSON: /data/javaagent/instrumentations/log4j-mdc-1.2/log4j-mdc-1.2-e01d913a710f.json
Explore: /java-agent/instrumentation/log4j-mdc-1.2