[jira] [Created] (SOLR-12438) Improve status reporting of metrics history API

["Andrzej Bialecki (JIRA)" <ji...@apache.org>]

Andrzej Bialecki  created SOLR-12438:
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             Summary: 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 
             Fix For: 7.4, master (8.0)


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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