Github user herval commented on the issue: https://github.com/apache/zeppelin/pull/2484 @jongyoul good q. I tried another stats libraries I've seen used around (airlift), but had a hard time reconciling dependencies, so went with the smallest footprint one + implementing the servlet myself. It looks like metrics-core is [pretty self contained too](https://mvnrepository.com/artifact/com.codahale.metrics/metrics-core/3.0.2) - I'd be fine giving it a try, if folks prefer it for some reason (I'm honestly not super up-to-speed on what's popular these days, so I'm glad to defer this decision :-))
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