Github user steveloughran commented on the pull request:
https://github.com/apache/spark/pull/9571#issuecomment-160000264
(Note that the POMs changed to pull in some more of the codahale servlets,
though only the health checks & thread dump are being registered. Hooking up
those servlets through the MetricsSystem may be a bit tricky; and as it has its
own metrics, is probably the one to go for. In which case: wrapping up JVM
stats as a `Source` would give automatic access to those numbers
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