How to Properly Configure Log4j2 gRPC Reporter for SkyWalking?

[lizeyuht22-hash]

Environment

• SkyWalking Version: 10.3.0-05c5b24
• SprintBoot Version: 2.6.2

Problem Description

I want to be able to view the trajectory and corresponding logs on SkyWalking. After adjusting the configuration, the log content is now visible on SkyWalking, but the endpoint and trace ID are not captured in the log details. Furthermore, I cannot associate the tracing with the corresponding logs.

Current Configuration

• log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO">
    <Appenders>
        <GRPCLogClientAppender name="grpc-log">
            <PatternLayout pattern="%d [%traceId] %-5p %c{1}:%L - %m%n"/>
        </GRPCLogClientAppender>
        <Console name="STDOUT" target="SYSTEM_OUT">
            <PatternLayout pattern="%d [%traceId] %-5p %c{1}:%L - %m%n"/>
        </Console>

    </Appenders>
    <Loggers>
        <AsyncLogger name="com.xxxx" level="info" additivity="false">
            <appender-ref ref="STDOUT"/>
            <appender-ref ref="grpc-log"/>
        </AsyncLogger>
        <AsyncRoot level="info" includeLocation="true">
            <AppenderRef ref="STDOUT"/>
            <AppenderRef ref="grpc-log"/>
        </AsyncRoot>
    </Loggers>
</Configuration>

• pom.xml

...
<dependency>
    <groupId>org.apache.skywalking</groupId>
    <artifactId>apm-toolkit-log4j-2.x</artifactId>
    <version>9.4.0</version>
</dependency>
...

SkyWalking UI Image

Question

How can I capture the endpoint and trace ID, and track the corresponding logs?

[wu-sheng]

You're using async logging, so they are not in the same context.

You could refer to https://skywalking.apache.org/docs/skywalking-java/latest/en/setup/service-agent/java-agent/application-toolkit-log4j-2.x/#grpc-reporter

Maybe you need an extra contextSelector config.