How to use the koop/lib.log function in koop

domain.run(function () {
    koop.log.info('starting job ' + job.id + ': ' + job.data.itemId + '_' + job.data.layerId)
    var completed = 0
    var len = job.data.pages.length
    var featureService = new FeatureService(job.data.serviceUrl, {logger: koop.log})

    // aggregate responses into one json and call done we have all of them
    // start the requests
    featureService.pageQueue.push(job.data.pages, function (error, json) {
      if (error || !json) {
        featureService.pageQueue.kill()
        throw error
      }

      // transform the data into geojson
      koop.GeoJSON.fromEsri(job.data.fields || [], json, function (err, geojson) {
        if (err) return callback(err)
        koop.Cache.insertPartial('agol', job.data.itemId, geojson, job.data.layerId, function (err) {
          if (err) {
            featureService.pageQueue.kill()
            koop.log.error('err')

koop.Cache.insertPartial('agol', job.data.itemId, geojson, job.data.layerId, function (err) {
          if (err) {
            featureService.pageQueue.kill()
            koop.log.error('err')
            var error = new Error('Error inserting rows into the db')
            error.type = 'db'
            throw error
          }
          completed++
          koop.log.info(completed + ' pages of ' + len + ' completed. ' + job.id + ': ' + job.data.itemId + '_' + job.data.layerId)
          job.progress(completed, len)

          if (completed === len) {
            var key = ['agol', job.data.itemId, job.data.layerId].join(':')
            koop.Cache.getInfo(key, function (err, info) {
              if (err) throw err
              if (info && info.status) delete info.status

              // if we've made it this far it's a success so return done with no argument
              koop.Cache.updateInfo(key, info, function () {
                return callback()
              })
            })
          }
        })
      })