What's DAT? Three Case Studies of Measuring Software Development Productivity at Meta With Diff Authoring Time. - Moritz Beller; Amanda Park; Karim Nakad; Akshay Patel; Sarita Mohanty; Ford Garberson; Ian G. Malone; Vaishali Garg; Henri Verroken; Andrew Kennedy; Pavel Avgustinov (CoRR, 2025)