A "developer diary" is a written or recorded journal-like entry where a developer shares their thoughts, progress, and experiences about creating a video game or software. Full definition
If you want an awesome asset today, the publisher has dropped the latest developer diary for the game, and it doesn't disappoint. (thatvideogameblog.com)
The complete package is explored in - depth in a new developer diary video. (arma3.com)
A couple of developer diary videos behind the game have been released thus far. (heavy.com)