"Change log" for Freshness and Volume Monitors

On the Assets page, users interact with our out-of-the-box monitors for Freshness and Volume. It's also where they can configure an explicit threshold, if they prefer that instead of the machine learning.

If a user adjusts sensitivity or switches to an explicit threshold, those changes are now captured in a "Change log" that they can easily view. This makes it easy to see who adjusted the settings, when, and how. This has been a well adopted feature in custom monitors, so we are glad to extend it here as well.