Judging from the resounding silence ;) it’s not a topic that people lose sleep 
over… I’ll go ahead then and do the upgrade + removal, both in master and in 
branch_8x. Feel free to chime in if you feel otherwise.

> On 17 Apr 2019, at 18:56, Andrzej Białecki <a...@getopt.org> wrote:
> 
> Hi all,
> 
> I’d like to draw your attention to SOLR-12461: Upgrade Dropwizard Metrics to 
> 4.0.5 release.
> 
> The upgrade would've been straightforward if not for the fact that Dropwizard 
> removed support for Ganglia reporter in 4x due to a transitive LGPL 
> dependency (on remotetea).
> 
> We have to upgrade this library on master - version 3x is not compatible with 
> Java 11 (due to the internal use of sun.misc.Unsafe), so the Ganglia reporter 
> on master is a goner either way. The question remains what to do about 8x.
> 
> We could stick to Metrics 3 on branch 8x in order to preserve back-compat, 
> but Metrics 4 contains many important bug fixes and improvements so it’s a 
> shame to have to keep using Metrics 3 for the complete lifecycle of 8x... I’m 
> rather inclined to break the back-compat (ever so slightly ;) ) for the 
> greater good - do the upgrade and remove Ganglia in 8x, and put a note in 
> CHANGES to that effect.
> 
> What do people think about this?
> 
> —
> 
> Andrzej Białecki
> 
> 
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