consul/ui-v2/app/controllers/dc/services/instance.js

import Controller from '@ember/controller';
import { get } from '@ember/object';
import { inject as service } from '@ember/service';

export default Controller.extend({
  notify: service('flashMessages'),
  actions: {
    error: function(e) {
      if (e.target.readyState === 1) {
        // OPEN
        if (get(e, 'error.errors.firstObject.status') === '404') {
          this.notify.add({
            destroyOnClick: false,
            sticky: true,
            type: 'warning',
            action: 'update',
          });
          [e.target, this.proxy].forEach(function(item) {
            if (item && typeof item.close === 'function') {
              item.close();
            }
          });
        }
      }
    },
  },
});