NotifyChange

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  needs: ['inner'],
  
  appName: 'Ember Twiddle',
  
  someProperty: {counter: 0},
  
  changeProperty: Ember.on('init', function() {
    let that = this;
    setInterval(function() {
      that.incrementProperty('someProperty.counter');
      that.notifyPropertyChange('someProperty');
    }, 1000);
  })
});

controllers.inner.js

import Ember from 'ember';

export default Ember.Controller.extend({
  needs: ['application'],
  
  pointer: Ember.computed.alias('controllers.application.someProperty'),
  
  aaa: {},
  
  alerting: (function() {
    console.log("A");
	}).observes('pointer').on('init')
  
});

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none'
});

Router.map(function() {
  this.route('inner');
});

export default Router;

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{someProperty.counter}}
<br>
{{outlet}}
<br>
<br>

templates.inner.hbs

Inner template

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.13.13",
    "ember-data": "1.13.15",
    "ember-template-compiler": "1.13.13"
  }
}