53 lines
1.3 KiB
Markdown
53 lines
1.3 KiB
Markdown
# Log4j 2 Integration
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This module integrates instrumentation with Log4j 2 by injecting the trace ID and span ID from a
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mounted span into Log4j's [context data](https://logging.apache.org/log4j/2.x/manual/thread-context.html).
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To use it, just add the module to your application's runtime classpath.
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**Maven**
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```xml
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<dependencies>
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<dependency>
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<groupId>io.opentelemetry.instrumentation</groupId>
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<artifactId>opentelemetry-log4j-2.13.2</artifactId>
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<version>0.7.0-SNAPSHOT</version>
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<scope>runtime</scope>
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</dependency>
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</dependencies>
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```
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**Gradle**
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```kotlin
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dependencies {
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runtimeOnly("io.opentelemetry.instrumentation:opentelemetry-log4j-2.13.2:0.7.0-SNAPSHOT")
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}
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```
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Log4j will automatically pick up our integration and will have these keys added to the context when
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a log statement is made when a span is active.
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- `traceId`
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- `spanId`
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- `traceFlags`
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You can use these keys when defining an appender in your `log4j.xml` configuration, for example
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<Configuration>
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<Appenders>
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<Console name="Console" target="SYSTEM_OUT">
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<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} traceId: %X{traceId} spanId: %X{spanId} - %msg%n" />
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</Console>
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</Appenders>
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<Loggers>
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<Root>
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<AppenderRef ref="Console" level="All" />
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</Root>
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</Loggers>
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</Configuration>
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```
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