FEATURE: if site is under extreme load show anon view

If a particular path is being hit extremely hard by logged on users,
revert to anonymous cached view.

This will only come into effect if 3 requests queue for longer than 2 seconds
on a *single* path.

This can happen if a URL is shared with the entire forum base and everyone
is logged on

app/assets/javascripts/discourse/components/global-notice.js.es6

@@ -9,6 +9,11 @@ export default Ember.Component.extend(bufferedRender({
   buildBuffer(buffer) {
     let notices = [];
 
+    if ($.cookie("dosp") === "1") {
+      $.cookie("dosp", null, { path: '/' });
+      notices.push([I18n.t("forced_anonymous"), 'forced-anonymous']);
+    }
+
     if (this.session.get('safe_mode')) {
       notices.push([I18n.t("safe_mode.enabled"), 'safe-mode']);
     }