August 26, 2020
Search Console began marking as "warning" any Dataset object that is missing the recommended property creator. Therefore you may see an increase in warnings for Dataset instances on your website.
July 1, 2020 onward
Search Console began marking as "warning" any Video object that is missing both embedUrl and contentUrl properties. This is not a change in requirements or behavior, but an improvement in our reporting system to better reflect the actual indexing behavior. Video objects that are missing both embedUrl and contentUrl properties can still appear as rich results but additional content based features of videos such as animated previews and key moments may not work. Therefore you might see an increase in warnings in Video items on your site. To fix this issue, define either of these two properties in your Video object. (Note that this does not affect Video items embedded within other types, such as Video within Recipe.)
April 29, 2020 onward
A new, optional property "Organizer" was introduced for Event items. Previously valid Event items might be labeled warning if you do not use this new properties, or error if you incorrectly defined it.
April 12, 2020 onward
All rich result types
These reports have been changed to cover a smaller number of pages, in order to provide better performance in Search Console. Because of this, you might see a decrease in the number of items and pages tracked in these reports. This change does not affect Search results, only the data reporting in Search Console.