Thanks for the clarification. I use PageSpeed via a couple of App Engine apps that have it enabled directly from App Engine's admin dashboard. I never had to change any DNS settings to get it to work. Does this shutdown also mean that PageSpeed will no longer be offered for App Engine apps? Do I need to take any action to avoid a service interruption for my users?
Yes, App Engine support is also deprecated:
If you are using PageSpeed integration on Google App
Engine, it will continue to function until 1st
December 2015, after which PageSpeed optimizations
will no-longer be applied to your app. No action is
required on the part of App Engine users; after this
date apps will continue to operate, except without
the benefit of the PageSpeed optimizations.
App Engine users only need to take action if they have something on their site that depends on PageSpeed, which is very uncommon.
* PageSpeed Insights: tells you how to make your website faster and gives you a score.
* PageSpeed Modules (mod_pagespeed/ngx_pagespeed): open source web server plugins that rewrite your site to load faster.
* PageSpeed Service: Google-hosted proxy version of the PageSpeed Modules.
We're only deprecating PageSpeed Service.
(I'm the TL for the open source modules.)