Something like this?

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

routes.test.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  start: Ember.computed('hours', function() {
    return moment().add(-(this.get('hours')/24, 'days').toISOString();
  }),
  
	hours: 24,

  model(params) {
		let hours = this.get('start');
 
    return Ember.RSVP.hash({
      app: this.get('store').findRecord('app', params.id),
      system: this.get('store').query('system-metric', {
        start: hours,
        app: params.id
      }),
      system2: this.get('store').query('system-metric', {
        start: hours,
        app: params.id
      }),
      disk: this.get('store').query('disk-usage', {
        start: hours,
        app: params.id
      }),
      network: this.get('store').query('network-load', {
        start: hours,
        app: params.id
      })
    });
  },
 actions: {
    updateData: function(hours) {
			this.set('hours', hours);
			this.refresh();
    },
  }
      
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}