Provide a way to reset timers on endpoints without requiring a service restart

[schlosna]

It'd be nice to have an admin task that allows for the reset of all timers. AFAIK currently the only way to do this is to bounce the service.

[schlosna]

Might be able to expose the HdrHistogramResetOnSnapshotReservoir which is "a reservoir that resets its internal state on each snapshot (which is how reporters get information from reservoirs)"

See also dropwizard/metrics#143 and http://taint.org/2014/01/16/145944a.html

[schlosna]

Going to close this out for now as I am not sure we want to snapshot everytime due to overhead and potential misuse via things like JMX monitors causing many snapshots during monitoring. See https://issues.apache.org/jira/browse/CASSANDRA-11752 for some background.

[schlosna]

Also see https://github.com/vladimir-bukhtoyarov/metrics-core-hdr