In capistrano3-puma v6.0.0, the default for 'puma_service_unit_name' changed to:
> "#{application}_puma_#{stage}"
But the installer uses the older convention:
> "puma_#{application}_#{stage}"
To ensure consistency and avoid unit name conflicts when switching between
versions or deploying older branches, we now define the variable explicitly
in config/deploy.rb:
> set :puma_service_unit_name, -> { "puma_#{fetch(:application)}_#{fetch(:stage)}" }
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