Roarca opened a new issue, #1740:
URL: https://github.com/apache/logging-log4j2/issues/1740
## Description
When on the client side you activate the **$PreserveFQDN** property on
**/etc/rsyslog.conf** , the logs do not include the FQDN and only include the
host
## Configuration
My rsyslog.conf configuration (everything is default except the parameter)
```txt
$PreserveFQDN on
```
The /etc/hosts file
```txt
127.0.0.1 host.app.example host
```
And the log4j2 configuration
```xml
<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
<Appenders>
<Console name="LogToConsole" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level
%logger{36} - %msg%n" />
</Console>
<Syslog name="RFC5424" format="RFC5424" host="localhost"
port="514" protocol="TCP" appName="app" includeMDC="true" facility="LOCAL0"
enterpriseNumber="18060" newLine="true" messageId="app-ID" mdcId="mdc"
id="app-MDCID" connectTimeoutMillis="1000" immediateFail="true"
reconnectionDelayMillis="5000">
<LoggerFields>
<KeyValuePair key="thread" value="%t" />
<KeyValuePair key="priority" value="%p" />
<KeyValuePair key="category" value="%c" />
<KeyValuePair key="exception" value="%ex" />
<KeyValuePair key="message" value="%m" />
</LoggerFields>
</Syslog>
</Appenders>
<category name="org.springframework.beans">
<priority value="info" />
</category>
<Loggers>
<Logger name="foo.example.ErrorService" additivity="false">
<AppenderRef ref="RFC5424" />
<AppenderRef ref="LogToConsole" />
</Logger>
</Loggers>
</Configuration>
```
**Version:** [Log4j version]
> 2.17.0
**Operating system:** [OS and version]
> SUSE Linux Enterprise Server 12 SP3
**JDK:** [JDK distribution and version]
> OpenJDK 64-Bit Server VM (build 25.292-b10, mixed mode)
## Logs
```log
2023-08-24 14:01:49.569 host app[4539] [status] Starting...
```
## Reproduction
Activating the **$PreserveFQDN** on parameter and having in **/etc/hosts**
an FQDN longer than the normal host should be enough, but ask any questions you
may have
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