I just noticed that: On the "We are currently offline for maintenance" page, the link to the blog leads to the ServerFault blog.
When the network is offline, the blog of our system administrators* is where we'll be putting "Oh my god everything's on fire!" type notices.
We don't put them on the per-site blogs as a rule, since that'd just be noise once the maintenance window is over.
*blog.serverfault.com is a bit special like blog.stackoverflow.com.