New: App health displayed in UI

src/UI/Health/HealthView.js

@@ -0,0 +1,39 @@
+'use strict';
+define(
+    [
+        'underscore',
+        'marionette',
+        'Health/HealthCollection'
+    ], function (_, Marionette, HealthCollection) {
+        return Marionette.ItemView.extend({
+            initialize: function () {
+                this.listenTo(HealthCollection, 'sync', this._healthSync);
+                HealthCollection.fetch();
+            },
+
+            render: function () {
+                this.$el.empty();
+
+                if (HealthCollection.length === 0) {
+                    return this;
+                }
+
+                var count = HealthCollection.length;
+                var label = 'label-warning';
+                var errors = HealthCollection.some(function (model) {
+                    return model.get('type') === 'error';
+                });
+
+                if (errors) {
+                    label = 'label-important';
+                }
+
+                this.$el.html('<span class="label pull-right {0}">{1}</span>'.format(label, count));
+                return this;
+            },
+
+            _healthSync: function () {
+                this.render();
+            }
+        });
+    });