openHAB - Filtering event logs

Tutorials & Examples
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So for those that want an OH3 filter that does as the first post asks with a simple cut and past solution try this example. (OpenHabian on Raspi 4 OpenHAB 3.2.0)

To filter out an entry in the log like:

2022-04-30 18:55:21.231 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'SqueezeBoxReceiverCurrentPlayingTime' changed from 227 to 228

Then edit /var/lib/openhab/etc/log4j2.xml

	...
	                <!-- Event log appender -->
                <RollingRandomAccessFile fileName="${sys:openhab.logdir}/events.log" filePattern="${sys:openhab.logdir}/events.log.%i" name="EVENT">


                        <!-- Regex Filter added below -->
                        <RegexFilter regex=".*CurrentPlayingTime.*" onMatch="DENY" onMismatch="ACCEPT"/>

                        <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5.5p] [%-36.36c] - %m%n"/>
                        <Policies>
                                <OnStartupTriggeringPolicy/>
                                <SizeBasedTriggeringPolicy size="16 MB"/>
                        </Policies>
                </RollingRandomAccessFile>
...

An example to filter out:

2022-04-30 19:07:05.368 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'ZWaveSerialControllerSerialSof' changed from 2489 to 2490

would be:

<RegexFilter regex=".*ZWaveSerial.*" onMatch="DENY" onMismatch="ACCEPT"/>

There can be only one filter line! So a compound filter to remove both log lines uses the OR operator and looks like:

<RegexFilter regex=".*CurrentPlayingTime.*||.*ZWaveSerial.*" onMatch="DENY" onMismatch="ACCEPT"/>

A good resource: https://logging.apache.org/log4j/2.x/manual/filters.html

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