change log; update history; what's new
Computing term for a record of changes or updates, often used in software, websites, or documentation. The cross-reference 更新履歴 is a near-synonym.
See also: 更新履歴
I checked the app's change log and understood the latest changes.
The update history on this page records all past corrections.
Compound of 更新 (update) and 暦 (calendar, record). The use of 暦 here is an extension meaning 'log' or 'history', likely influenced by computing terminology.