So we can reasonably expect these "take $platform down to avoid pwn" situations to occur ~periodically. We also have caching proxies and CDNs everywhere, mostly based on OSS implementations.
Do we have an out-of-the box solution for "serve everything from cache until I say otherwise" mode with e.g.
#nginx or
#caddy? Like you would still serve most of your forum/wiki/blog/... statically, without exposing any attack surface of your webapp engine.