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https://issues.apache.org/jira/browse/LOG4J2-2003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16307083#comment-16307083
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Ralph Goers commented on LOG4J2-2003:
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Is there a reason MyApp.log can't be configured as a property like logdir is?
> Hierarchical component properties
> ---------------------------------
>
> Key: LOG4J2-2003
> URL: https://issues.apache.org/jira/browse/LOG4J2-2003
> Project: Log4j 2
> Issue Type: Wish
> Components: Configurators
> Affects Versions: 2.8.2
> Reporter: Paul Burrowes
> Priority: Minor
>
> It would be very nice when configuring multiple appenders with complex
> configuration to be able to substitute properties defined in the appender
> section. Being able to create local properties within an appender config
> would remove the need to have the log filename repeated in each attribute
> that uses a variant on it.
> The current config only allows properties at the global level thus requires
> the log filename to be repeated multiple times e.g. in this configuration the
> string "MyApp.log" must be repeated three times to construct a
> RollingFileAppender with a delete action.
> {noformat}
> <Configuration name="MyApp Configuration" status="ERROR">
> <Properties>
> <Property name="MyAppVersionHeader">%d{yyyy-MM-dd HH:mm:ss.SSS}
> ${VERSION} log file started\n</Property>
> <Property name="logDir">${sys:MyApp.dir.work}/log</Property>
> <Property name="VERSION">1c91bff2e</Property>
> <Property name="maxArchivedFiles">4</Property>
> </Properties>
> <RollingFile name="MyAppLog" filePattern="${logDir}/MyApp.log.%i"
> fileName="${logDir}/MyApp.log">
> <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSSZ} %-7level [%logger]
> <%threadName> %mdc %msg%n%throwable" header="${MyAppVersionHeader}"/>
> <SizeBasedTriggeringPolicy size="100MB"/>
> <DefaultRolloverStrategy min="1" max="2147483647">
> <Delete maxDepth="1" basePath="${logDir}">
> <IfAccumulatedFileCount exceeds="${maxArchivedFiles}"/>
> <IfFileName glob="MyApp.log.*"/>
> </Delete>
> </DefaultRolloverStrategy>
> </RollingFile>
> ...
> </{noformat}
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