class Ougai::Logger

def create_formatter
  proc do |severity, time, progname, data|
    JSON.generate({
      name: progname || @app_name,
      hostname: @hostname,
      pid: $$,
      level: to_level(severity),
      time: time.iso8601(3),
      v: 0
    }.merge(data)) + "\n"
  end
end