```ruby
require "ok_computer/engine"
require "ok_computer/configuration"
require "ok_computer/check"
require "ok_computer/check_collection"
require "ok_computer/registry"

# and the built-in checks
require "ok_computer/built_in_checks/size_threshold_check"
require "ok_computer/built_in_checks/active_record_check"
require "ok_computer/built_in_checks/default_check"
require "ok_computer/built_in_checks/mongoid_check"
require "ok_computer/built_in_checks/resque_backed_up_check"
require "ok_computer/built_in_checks/resque_down_check"
require "ok_computer/built_in_checks/delayed_job_backed_up_check"
require "ok_computer/built_in_checks/ruby_version_check"
require "ok_computer/built_in_checks/cache_check"

# Remove the following code in version 1.0.0
module OKComputer
  def self.method_missing(*args)
    raise 'Please replace all usages of `OKComputer` with `OkComputer` (lowercase `k`)'
  end
end

OkComputer::Registry.register "default", OkComputer::DefaultCheck.new
OkComputer::Registry.register "database", OkComputer::ActiveRecordCheck.new
```

Remove check for legacy OKComputer namespace
user
```ruby
require "ok_computer/engine"
require "ok_computer/configuration"
require "ok_computer/check"
require "ok_computer/check_collection"
require "ok_computer/registry"

# and the built-in checks
require "ok_computer/built_in_checks/size_threshold_check"
require "ok_computer/built_in_checks/active_record_check"
require "ok_computer/built_in_checks/default_check"
require "ok_computer/built_in_checks/mongoid_check"
require "ok_computer/built_in_checks/resque_backed_up_check"
require "ok_computer/built_in_checks/resque_down_check"
require "ok_computer/built_in_checks/delayed_job_backed_up_check"
require "ok_computer/built_in_checks/ruby_version_check"
require "ok_computer/built_in_checks/cache_check"

OkComputer::Registry.register "default", OkComputer::DefaultCheck.new
OkComputer::Registry.register "database", OkComputer::ActiveRecordCheck.new
```
assistant