Changes to records are now automatically captures in the Record Feeds. These updates appear on the records themselves and provide a full history of the values of the records.
These updates also appear in the notifications if you're following a particular record - so you'll never miss an important update again.
Record activity posts in the feed can be commented on in the related thread like any other feed post, and the whole feed can be filtered to show just messages, or just record activity posts.
Record Activity Feeds