Per docs, Clockwork will only write to STDOUT unless you configure it otherwise:
By default Clockwork logs to STDOUT. In case you prefer your own logger implementation you have to specify the logger configuration option. See example below.
Example from the docs is this:
module Clockwork
configure do |config|
config[:sleep_timeout] = 5
config[:logger] = Logger.new(log_file_path)
config[:tz] = 'EST'
config[:max_threads] = 15
config[:thread] = true
end
end