nickva opened a new pull request, #5849:
URL: https://github.com/apache/couchdb/pull/5849

   Add `upgrade_in_progress` config and metrics Also, add the same for 
`maintenance_mode`.
   
   When doing upgrades it's nicer to set an explicit config setting for the 
duration of the upgrade so some background activity can pause or change its 
behavior.
   
   One example may be to stop all the scanner plugins. To avoid them having to 
stop/start multiple times during upgrades as nodes are toggled in/our of mm 
mode, it might be better to just have toggle that stays on for the duration of 
the upgrade.
   
   Add metric gauges so upgrades and mm toggles are visible in the metric 
timeline, which can also aid in investigating various issues.
   
   Use the new `upgrade_in_progress` toggle to stop scanner plugins when 
upgrades are happening.


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