discourse/app/assets/javascripts/admin/addon/routes/admin-dashboard-reports.js

import DiscourseRoute from "discourse/routes/discourse";
import { ajax } from "discourse/lib/ajax";

export default DiscourseRoute.extend({
  model() {
    return ajax("/admin/reports");
  },

  setupController(controller, model) {
    controller.setProperties({ model: model.reports, filter: null });
  },
});