Yammer's Metrics library.
'com.yammer.metrics:metrics-logback:2.0.2'
<dependency>
<groupId>com.yammer.metrics</groupId>
<artifactId>metrics-logback</artifactId>
<version>2.0.2</version>
</dependency>
<dependency org="com.yammer.metrics" name="metrics-logback" rev="2.0.2"/>
"com.yammer.metrics", "metrics-logback", "2.0.2"