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https://issues.apache.org/jira/browse/SOLR-4735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15695483#comment-15695483
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Kelvin Wong commented on SOLR-4735:
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{quote}
Having a reload reset stats is a bad idea. We can provide an explicit API to
reset stats for a node or a core if required.
{quote}
Right now, each producer creates/manages its own set of metrics. It might make
sense to have some global object creating/managing all our metrics instead.
Each producer can then call {{getOrCreate}} so that the same set of metrics are
used across core reloads. My only concern here is how to namespace the metrics
so that different producers clash on metric names. Perhaps give each producer
access to the core name?
{quote}
Perhaps SolrMetricManager should use long-lived MetricRegistry instances that
are managed in SharedMetricsRegistries?
{quote}
Sounds good. One suggestion I have is to namespace the registries. For example,
we can have each {{SolrCore}} report on a registry, Jetty report on another,
JVM on another, etc... Then we can configure reporters for each such registry
by just specifying its name. This keeps the different sets of metrics nicely
isolated and gives us flexibility as to how to report each set of metrics?
> Improve Solr metrics reporting
> ------------------------------
>
> Key: SOLR-4735
> URL: https://issues.apache.org/jira/browse/SOLR-4735
> Project: Solr
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Andrzej Bialecki
> Priority: Minor
> Attachments: SOLR-4735.patch, SOLR-4735.patch, SOLR-4735.patch,
> SOLR-4735.patch
>
>
> Following on from a discussion on the mailing list:
> http://search-lucene.com/m/IO0EI1qdyJF1/codahale&subj=Solr+metrics+in+Codahale+metrics+and+Graphite+
> It would be good to make Solr play more nicely with existing devops
> monitoring systems, such as Graphite or Ganglia. Stats monitoring at the
> moment is poll-only, either via JMX or through the admin stats page. I'd
> like to refactor things a bit to make this more pluggable.
> This patch is a start. It adds a new interface, InstrumentedBean, which
> extends SolrInfoMBean to return a
> [[Metrics|http://metrics.codahale.com/manual/core/]] MetricRegistry, and a
> couple of MetricReporters (which basically just duplicate the JMX and admin
> page reporting that's there at the moment, but which should be more
> extensible). The patch includes a change to RequestHandlerBase showing how
> this could work. The idea would be to eventually replace the getStatistics()
> call on SolrInfoMBean with this instead.
> The next step would be to allow more MetricReporters to be defined in
> solrconfig.xml. The Metrics library comes with ganglia and graphite
> reporting modules, and we can add contrib plugins for both of those.
> There's some more general cleanup that could be done around SolrInfoMBean
> (we've got two plugin handlers at /mbeans and /plugins that basically do the
> same thing, and the beans themselves have some weirdly inconsistent data on
> them - getVersion() returns different things for different impls, and
> getSource() seems pretty useless), but maybe that's for another issue.
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