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https://issues.apache.org/jira/browse/KAFKA-826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13619475#comment-13619475
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Otis Gospodnetic commented on KAFKA-826:
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Ah, what timing!  Metrics 3.0.0 BETA1 has just been pushed to Maven Central 
with goodies:
Coda Hale <coda.h...@gmail.com> Apr 01 02:02PM -0700  

Metrics 3.0.0-BETA1 is on its way to Maven Central! It includes the following 
changes:
 
• Total overhaul of most of the core Metrics classes:
• Metric names are now just dotted paths like com.example.Thing, allowing for 
very flexible scopes, etc.
• Meters and timers no longer have rate or duration units; those are properties 
of reporters.
• Reporter architecture has been radically simplified, fixing many bugs.
• Histograms and timers can take arbitrary reservoir implementations.
• Added sliding window reservoir implementations.
• Added MetricSet for sets of metrics.
• Changed package names to be OSGi-compatible and added OSGi bundling.
• Extracted JVM instrumentation to metrics-jvm.
• Extracted Jackson integration to metrics-json.
• Removed metrics-guice, metrics-scala, and metrics-spring.
• Renamed metrics-servlet to metrics-servlets.
• Renamed metrics-web to metrics-servlet.
• Renamed metrics-jetty to metrics-jetty8.
• Many more small changes!

Wouldn't it make sense to invest the effort into moving to 3.0.0 instead now?  
Otherwise, if the gap between 0.8 and post-0.8 release is as big as the gap 
between 0.7.2 and 0.8 it will be a while before moving to this new metrics 
package.

                
> Make Kafka 0.8 depend on metrics 2.2.0 instead of 3.x
> -----------------------------------------------------
>
>                 Key: KAFKA-826
>                 URL: https://issues.apache.org/jira/browse/KAFKA-826
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.8
>            Reporter: Neha Narkhede
>            Assignee: Jun Rao
>            Priority: Blocker
>              Labels: build, kafka-0.8, metrics
>         Attachments: kafka-fix-for-826.patch, kafka-fix-for-826-take2.patch
>
>
> In order to mavenize Kafka 0.8, we have to depend on metrics 2.2.0 since 
> metrics 3.x is a huge change as well as not an officially supported release.

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