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https://issues.apache.org/jira/browse/SOLR-11779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16509609#comment-16509609
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Yonik Seeley commented on SOLR-11779:
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I'd consider it a minor bug for our default configs to be throwing exceptions
by default when nothing is wrong.
I'd suggest that this should not be a WARN level message (and definitely
shouldn't log an exception).
The text of the log message could be changed to remove the word Error as well,
since it's not an error case.
Perhaps "No .system collection, keeping metrics history in memory"
> Basic long-term collection of aggregated metrics
> ------------------------------------------------
>
> Key: SOLR-11779
> URL: https://issues.apache.org/jira/browse/SOLR-11779
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: metrics
> Affects Versions: 7.3, master (8.0)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: SOLR-11779.patch, SOLR-11779.patch, SOLR-11779.patch,
> SOLR-11779.patch, c1.png, c2.png, core.json, d1.png, d2.png, d3.png,
> jvm-list.json, jvm-string.json, jvm.json, o1.png, u1.png
>
>
> Tracking the key metrics over time is very helpful in understanding the
> cluster and user behavior.
> Currently even basic metrics tracking requires setting up an external system
> and either polling {{/admin/metrics}} or using {{SolrMetricReporter}}-s. The
> advantage of this setup is that these external tools usually provide a lot of
> sophisticated functionality. The downside is that they don't ship out of the
> box with Solr and require additional admin effort to set up.
> Solr could collect some of the key metrics and keep their historical values
> in a round-robin database (eg. using RRD4j) to keep the size of the historic
> data constant (eg. ~64kB per metric), but at the same providing out of the
> box useful insights into the basic system behavior over time. This data could
> be persisted to the {{.system}} collection as blobs, and it could be also
> presented in the Admin UI as graphs.
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