Check for @since version - Yoast/wordpress-develop-mirror GitHub Wiki

For this to work you need to have a clone of the original WordPress-develop repository. This can be found here: https://github.com/wordpress/wordpress-develop. Clone using: git clone [email protected]:WordPress/wordpress-develop.git.

Then you can use git blame on files to see the commit hashes for the different lines in the file. Make sure the commit actually added the new functions/classes/files. Or use the annotation feature of PHPStorm.

For the @since you can simply do:

git tag --contains commithash

Replace the commithash with the actual one.