discourse/app/assets/javascripts/admin/routes/admin-backups-logs.js.es6

export default Ember.Route.extend({

  // since the logs are pushed via the message bus
  // we only want to preload them (hence the beforeModel hook)
  beforeModel() {
    const logsController = this.controllerFor("adminBackupsLogs");
    // preload the logs if any
    PreloadStore.getAndRemove("logs").then(function (preloadedLogs) {
      if (preloadedLogs && preloadedLogs.length) {
        // we need to filter out message like: "[SUCCESS]"
        // and convert POJOs to Ember Objects
        const logs = _.chain(preloadedLogs)
                    .reject(function (log) { return log.message.length === 0 || log.message[0] === "["; })
                    .map(function (log) { return Em.Object.create(log); })
                    .value();
        logsController.pushObjects(logs);
      }
    });
  },

  setupController() { /* prevent default behavior */ }

});