class Ougai::Formatters::Bunyan

def call(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