Yammer's Metrics library.
'com.yammer.metrics:metrics-ehcache:2.1.1'
<dependency>
<groupId>com.yammer.metrics</groupId>
<artifactId>metrics-ehcache</artifactId>
<version>2.1.1</version>
</dependency>
<dependency org="com.yammer.metrics" name="metrics-ehcache" rev="2.1.1"/>
"com.yammer.metrics", "metrics-ehcache", "2.1.1"