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https://issues.apache.org/jira/browse/SOLR-15300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17321995#comment-17321995
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Jan Høydahl commented on SOLR-15300:
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I left a comment in PR. I think RED should be reserved for ALL replicas down,
or no leader. Then ORANGE can be "many or most replicas down". You'd want to
draw attention to YELLOW state in a dashboard, for ORANGE state you'd start
Slack alerting or SMS during daytime. For RED you'd wake everyone up in the
middle of the night. Which begs the question whether no leader alone should
trigger RED?
> Shard "state" flag is confusing and of limited value to outside consumers
> -------------------------------------------------------------------------
>
> Key: SOLR-15300
> URL: https://issues.apache.org/jira/browse/SOLR-15300
> Project: Solr
> Issue Type: Improvement
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Solr API (and consequently the metric reporters, which are often used for
> Solr monitoring) report the shard as being in ACTIVE state even when in
> reality its functionality is severely compromised (eg. no replicas, all
> replicas down, or no leader).
> This reported state is technically correct because it is used only for
> tracking of the SPLITSHARD operations, as defined in {{Slice.State}}.
> However, this may be misleading and more often unhelpful than not - for
> constant monitoring a flag that actually reports impaired functionality of a
> shard would be more useful than a flag that reports a relatively uncommon
> SPLITSHARD operation.
> We could either redefine the meaning of the existing flag (and change its
> state according to some of the criteria I listed above), or add another flag
> to represent the "health" status of a shard. The value of this flag would
> then provide an easy way to monitor and to alert external systems of
> dangerous function impairment, without monitoring the state of all replicas
> of a collection.
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