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https://issues.apache.org/jira/browse/SOLR-12438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502397#comment-16502397
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Andrzej Bialecki commented on SOLR-12438:
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This patch contains the following changes:
* the API works now also in non-cloud mode.
* report the current "mode" (disabled, memory, index).
* automatically pull in-memory history from Overseer when request is submitted
to any node and when the API is in non-persistent mode (the data is not
available then in the {{.system}} collection)
* report the source node where the data was obtained from. When in "index" mode
the source node is always the one where the request was submitted to.
> Improve status reporting of metrics history API
> -----------------------------------------------
>
> Key: SOLR-12438
> URL: https://issues.apache.org/jira/browse/SOLR-12438
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: metrics
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: SOLR-12438.patch
>
>
> In an offline conversation with [~janhoy] we identified the following areas
> of improvement to the metrics history API in order to increase its
> user-friendliness and provide more details about its status.
>
> * there are three possible states for the API: inactive (when not in cloud
> mode), in-memory only (when {{.system}} collection doesn’t exist), and
> persisted when it’s both active and persisted in Solr. The
> /admin/metrics/history endpoint should give some hint about this status, such
> as "mode":"memory/index", "active": true|false. Or a separate action=status
> just to poll status? Currently when the API is inactive it simply returns 404
> Not Found.
> * when in "memory" mode a call to /admin/metrics/history on a non-overseer
> node should forward the request to the overseer, so that the client does not
> need to care what mode it is in - kind of like how a query works in
> distributed mode.
> * better documentation for the API behavior in each mode.
> * perhaps if mode=memory, there could also be a "message":"Warning, metrics
> history is not being persisted. Please create the .system collection to start
> persisting history"
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