Lo4j config - Log to different files based on type of mesasge prefix - log4j2

Question

Hello I am using Log4j2 for my logging and I am little confused as to how I can log message to a different file based on the message prefix.
For example, currently all messages are logged in a single logs folder.
A set of my messages look like this:
'com.project.latency: ProjectName=[MooPointProject].......'
Some of my other log messages are of the format:
'com.project.latency: ProjectName=[DataPlaneProject].......'
I want to log the messages which contain the MooPointProject in a specific file and one containing DataPlaneProject in a separate log file.
Is there a specific way I can do that other than changing the logging level itself?

Answer 1

Set up several appenders one for each project name. For example:
<RollingFile name="RollingFile" fileName="logs/MooPointProject.log"
filePattern="logs/app-%d{MM-dd-yyyy}.log.gz">
<RegexFilter regex=".*MooPointProject.*" onMatch="ACCEPT" onMismatch="DENY"/>
<PatternLayout>
<pattern>%d %p %c{1.} [%t] %m%n</pattern>
</PatternLayout>
<TimeBasedTriggeringPolicy />
</RollingFile>
and
<RollingFile name="RollingFile" fileName="logs/DataPlaneProject.log"
filePattern="logs/app-%d{MM-dd-yyyy}.log.gz">
<RegexFilter regex=".*DataPlaneProject.*" onMatch="ACCEPT" onMismatch="DENY"/>
<PatternLayout>
<pattern>%d %p %c{1.} [%t] %m%n</pattern>
</PatternLayout>
<TimeBasedTriggeringPolicy />
</RollingFile>
Then assign both the appenders to your logger(s). Since your RegexpFilter accepts only a project-spcific lines you will get them to the appropriate files separately.
P.S. - Find the detail on other types of filters here.