Last week, John Mueller announced that Google is moving all of its blogs to a custom domain: googleblog.com. For example, Gmail's blog has a new URL: gmail.googleblog.com, which replaces gmailblog.blogspot.com.
"Google is moving its blogs to a new domain to help people recognize when they're reading an official blog from Google. These changes will roll out to all of Google's blogs over time. The previous address will redirect to the new domain, so your bookmarks and links will continue to work."