consul/ui/packages/consul-ui/app/routes/dc/services/show/index.js

import Route from '@ember/routing/route';
import { get } from '@ember/object';

export default Route.extend({
  afterModel: function(model, transition) {
    const parent = this.routeName
      .split('.')
      .slice(0, -1)
      .join('.');
    // the default selected tab depends on whether you have any healthchecks or not
    // so check the length here.
    let to = 'topology';
    const parentModel = this.modelFor(parent);
    const hasProxy = get(parentModel, 'proxies');
    const kind = get(parentModel, 'items.firstObject.Service.Kind');

    if (hasProxy.length === 0) {
      to = 'instances';
    } else {
      switch (kind) {
        case 'ingress-gateway':
          if (!get(parentModel, 'topology.Datacenter')) {
            to = 'upstreams';
          }
          break;
        case 'terminating-gateway':
          to = 'services';
          break;
        case 'mesh-gateway':
          to = 'instances';
          break;
        default:
          if (!get(parentModel, 'topology.Datacenter')) {
            to = 'instances';
          }
      }
    }

    this.replaceWith(`${parent}.${to}`, parentModel);
  },
});