[PR] Upgrade in progress toggle [couchdb]

["nickva (via GitHub)" <gi...@apache.org>]

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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Re: [PR] Upgrade in progress toggle [couchdb]

["nickva (via GitHub)" <gi...@apache.org>]

nickva merged PR #5849:
URL: https://github.com/apache/couchdb/pull/5849


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