Openhab3: Logging specific Item(s) to a separate new log file - Solution

I have a sensor which is measuring a value frequently (temperature) which I want in a new Log file and not in the main events.log. It is just the event I am interested in, so no rule is needed for this. So there I found this solution if anyone is interested:

temperature.item:

Number i_temperature {channel="mqtt:topic:Mosquitto2:tempsensor"}

openHAB-userdata\etc\log4j2.xml:

<?xml version="1.0" encoding="UTF-8" standalone="no"?><Configuration monitorInterval="10">

	<Appenders>
		<!-- Console appender not used by default (see Root logger AppenderRefs) -->
		<Console name="STDOUT">
			<PatternLayout pattern="%d{HH:mm:ss.SSS} [%-5.5p] [%-36.36c] - %m%n"/>
		</Console>

		<!-- temperature custom file appender -->	
		<RollingRandomAccessFile fileName="${sys:openhab.logdir}/temperature.log" filePattern="${sys:openhab.logdir}/temperature.log.%i" name="TEMPERATURE">
			<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS}	%m%n"/>
			<RegexFilter onMatch="ACCEPT" onMismatch="DENY" regex=".*(i_temperature).*"/>
			<Policies>
				<OnStartupTriggeringPolicy/>
				<SizeBasedTriggeringPolicy size="16 MB"/>
			</Policies>
		</RollingRandomAccessFile>					 

		<!-- Rolling file appender -->
		<RollingFile fileName="${sys:openhab.logdir}/openhab.log" filePattern="${sys:openhab.logdir}/openhab.log.%i" name="LOGFILE">
			<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5.5p] [%-36.36c] - %m%n"/>
			<RegexFilter onMatch="DENY" onMismatch="ACCEPT" regex=".*(i_temperature).*"/>
			<Policies>
				<OnStartupTriggeringPolicy/>
				<SizeBasedTriggeringPolicy size="16 MB"/>
			</Policies>
		</RollingFile>

		<!-- .*(ShellyFarbe|rgbwcounter|owb_CurrentTemperature changed|Azimuth changed|Elevation changed|Bewegungsmelder1_helligkeit changed|chromecast:.*?(ManagedThingProvider, because|changed from .*?OFFLINE)|ChromeCastException: Remote).* -->
		<!-- Event log appender -->
		<RollingRandomAccessFile fileName="${sys:openhab.logdir}/events.log" filePattern="${sys:openhab.logdir}/events.log.%i" name="EVENT">
			<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5.5p] [%-36.36c] - %m%n"/>
			<RegexFilter onMatch="DENY" onMismatch="ACCEPT" regex=".*(i_temperature).*"/>
			<Policies>
				<OnStartupTriggeringPolicy/>
				<SizeBasedTriggeringPolicy size="16 MB"/>
			</Policies>
		</RollingRandomAccessFile>

		<!-- Audit file appender -->
		<RollingRandomAccessFile fileName="${sys:openhab.logdir}/audit.log" filePattern="${sys:openhab.logdir}/audit.log.%i" name="AUDIT">
			<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5.5p] [%-36.36c] - %m%n"/>
			<Policies>
				<OnStartupTriggeringPolicy/>
				<SizeBasedTriggeringPolicy size="8 MB"/>
			</Policies>
		</RollingRandomAccessFile>

		<!-- OSGi appender -->
		<PaxOsgi filter="*" name="OSGI"/>
	</Appenders>

	<Loggers>
		<!-- Root logger configuration -->
		<Root level="WARN">
			<AppenderRef ref="LOGFILE"/>
			<AppenderRef ref="OSGI"/>
		</Root>

		<!-- Karaf Shell logger -->
		<Logger level="OFF" name="org.apache.karaf.shell.support">
			<AppenderRef ref="STDOUT"/>
		</Logger>

		<!-- Security audit logger -->
		<Logger additivity="false" level="INFO" name="org.apache.karaf.jaas.modules.audit">
			<AppenderRef ref="AUDIT"/>
		</Logger>

		<!-- openHAB specific logger configuration -->

		<Logger level="INFO" name="org.openhab"/>


		<Logger level="ERROR" name="openhab.event.ItemStateEvent"/>
		<Logger level="ERROR" name="openhab.event.ItemAddedEvent"/>
		<Logger level="ERROR" name="openhab.event.ItemRemovedEvent"/>
		<Logger level="ERROR" name="openhab.event.ItemChannelLinkAddedEvent"/>
		<Logger level="ERROR" name="openhab.event.ItemChannelLinkRemovedEvent"/>
		<Logger level="ERROR" name="openhab.event.ThingStatusInfoEvent"/>
		<Logger level="ERROR" name="openhab.event.ThingAddedEvent"/>
		<Logger level="ERROR" name="openhab.event.ThingUpdatedEvent"/>
		<Logger level="ERROR" name="openhab.event.ThingRemovedEvent"/>
		<Logger level="ERROR" name="openhab.event.InboxUpdatedEvent"/>
		<Logger level="ERROR" name="openhab.event.RuleStatusInfoEvent"/>
		<Logger level="ERROR" name="openhab.event.RuleAddedEvent"/>
		<Logger level="ERROR" name="openhab.event.RuleRemovedEvent"/>
		<Logger level="ERROR" name="openhab.event.StartlevelEvent"/>
		<Logger level="ERROR" name="openhab.event.AddonEvent"/>

		<Logger additivity="false" level="INFO" name="openhab.event">
			<AppenderRef ref="EVENT"/>
			<AppenderRef ref="TEMPERATURE"/>
			<AppenderRef ref="OSGI"/>
		</Logger>

		<Logger level="ERROR" name="javax.jmdns"/>
		<Logger level="ERROR" name="org.jupnp"/>

		<!-- This suppresses all Maven download issues from the log when doing feature installations -->
		<!-- as we are logging errors ourselves in a nicer way anyhow. -->
		<Logger level="ERROR" name="org.ops4j.pax.url.mvn.internal.AetherBasedResolver"/>

		<!-- Filters known issues of pax-web (issue link to be added here). -->
		<!-- Can be removed once the issues are resolved in an upcoming version. -->
		<Logger level="OFF" name="org.ops4j.pax.web.pax-web-runtime"/>

		<!-- Filters known issues of lsp4j, see -->
		<!-- https://github.com/eclipse/smarthome/issues/4639 -->
		<!-- https://github.com/eclipse/smarthome/issues/4629 -->
		<!-- https://github.com/eclipse/smarthome/issues/4643 -->
		<!-- Can be removed once the issues are resolved in an upcoming version. -->
		<Logger level="OFF" name="org.eclipse.lsp4j"/>

		<!-- Filters warnings for events that could not be delivered to a disconnected client. -->
		<Logger level="ERROR" name="org.apache.cxf.jaxrs.sse.SseEventSinkImpl"/>

		<!-- Filters known issues of KarServiceImpl, see -->
		<!-- https://github.com/openhab/openhab-distro/issues/519#issuecomment-351944506 -->
		<!-- Can be removed once the issues are resolved in an upcoming version. -->
		<Logger level="ERROR" name="org.apache.karaf.kar.internal.KarServiceImpl"/>

		<!-- Filters warnings about unavailable ciphers when JCE is not installed, see -->
		<!-- https://github.com/openhab/openhab-distro/issues/999 -->
		<Logger level="ERROR" name="org.apache.karaf.shell.ssh.SshUtils"/>

		<!-- Filters known issues of javax.mail, see -->
		<!-- https://github.com/openhab/openhab-addons/issues/5530 -->
		<Logger level="ERROR" name="javax.mail"/>

		<!-- Filters disconnection warnings of the ChromeCast Java API, see -->
		<!-- https://github.com/openhab/openhab-addons/issues/3770 -->
		<Logger level="ERROR" name="su.litvak.chromecast.api.v2.Channel"/>

		<!-- Added by Karaf to prevent debug logging loops, see -->
		<!-- https://issues.apache.org/jira/browse/KARAF-5559 -->
		<Logger level="WARN" name="org.apache.sshd"/>   
	</Loggers>
</Configuration>
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