```ruby
workers Integer(ENV['WEB_CONCURRENCY'] || 2)
threads_count = Integer(ENV['RAILS_MAX_THREADS'] || 2)
threads threads_count, threads_count

preload_app!

rackup      DefaultRackup
port        ENV['PORT']     || 3000
environment ENV['RACK_ENV'] || 'development'

on_worker_boot do
  # Worker specific setup for Rails 4.1+
  # See: https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server#on-worker-boot
  ActiveRecord::Base.establish_connection
end

before_fork do
  require 'puma_worker_killer'

  PumaWorkerKiller.enable_rolling_restart(12.hours)
end

if %w(development test).include?(ENV['RACK_ENV'])
  worker_timeout 10.minutes
end
```

Revert rolling restarts to 3 hours
user
```ruby
workers Integer(ENV['WEB_CONCURRENCY'] || 2)
threads_count = Integer(ENV['RAILS_MAX_THREADS'] || 2)
threads threads_count, threads_count

preload_app!

rackup      DefaultRackup
port        ENV['PORT']     || 3000
environment ENV['RACK_ENV'] || 'development'

on_worker_boot do
  # Worker specific setup for Rails 4.1+
  # See: https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server#on-worker-boot
  ActiveRecord::Base.establish_connection
end

before_fork do
  require 'puma_worker_killer'

  PumaWorkerKiller.enable_rolling_restart(3.hours)
end

if %w(development test).include?(ENV['RACK_ENV'])
  worker_timeout 10.minutes
end
```
assistant