[memo] How to get hostname with logback

Just use ${HOSTNAME} logback can get hostname. Don't set hostname manually. It may make other engineers try to fix problem on other server. It's my experience. :)

	<appender name="EMAIL-REPORT"
	class="ch.qos.logback.classic.net.SMTPAppender">
	<SMTPHost>localhost</SMTPHost>
	<From>myaddress@mymail.com</From>
	<To>myaddress@mymail.com</To>
	<Subject>[REPORT]Batch done in ${HOSTNAME}</Subject>
	<CharsetEncoding>iso-2022-jp</CharsetEncoding>
	<Evaluator class="com.my.logback.ServiceReport">
	<level>INFO</level>
	</Evaluator>
	<layout class="ch.qos.logback.classic.PatternLayout">
	<Pattern>%msg%n</Pattern>
	</layout>
	</appender>

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