Commits on Apr 26, 2024

1. kvcoord: introduce a new setting to toggle DistSender circuit breakers …

   This patch introduces a new cluster setting, called
   `kv.dist_sender.circuit_breakers.mode`, which may be used to configure
   the behaviour of DistSender circuit breakers. This subsumes the previous
   cluster setting, `kv.dist_sender.circuit_breaker.enabled`, which is now
   removed.
   
   The new enum cluster setting comes in 3 variants:
   
   - No ranges: circuit breakers disabled.
   - Node liveness only: circuit breakers are only enabled for replicas
   belonging to the liveness range.
   - All ranges: circuit breakers are enabled for replicas belonging to
   all ranges.
   
   Currently, when configured to node liveness only mode, the setting is
   a lie -- it behaves as if circuit breakers are off. We'll change this
   in the future, underneath the cluster setting.
   
   Informs #123117
   
   Release note: None

   

   arulajmani committed Apr 26, 2024
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2. kvcoord: disable DistSender circuit breakers by default …

   Closes #122983
   
   Release note: None

   

   arulajmani committed Apr 26, 2024
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