How to use the librato-node.middleware function in librato-node

const data = logfmt.requestLogger.commonFormatter(req, res)
  data.useragent = req.headers['user-agent']
  return data
}))

// Parse cookies (for determining to pre-render or not)
app.use(cookieParser())

// Send stats to Librato
librato.configure({
  email: process.env.LIBRATO_EMAIL,
  token: process.env.LIBRATO_TOKEN,
  source: process.env.DYNO,
})
librato.start()
app.use(librato.middleware())

librato.on('error', (err) => {
  console.log('[librato] ERROR', err)
})

// Use Helmet to lock things down
app.use(helmet())

const indexStr = fs.readFileSync(path.join(__dirname, './../../public/index.html'), 'utf-8')
const stats = JSON.parse(fs.readFileSync(path.join(__dirname, './../../webpack-stats/server.json'), 'utf-8'))

// Wire up OAuth route
addOauthRoute(app)

// Assets
app.use(express.static('public', { index: false, redirect: false }))