On the Studio Client side, the ThumbnailService and the EditorContext allow to register ThumbnailResolvers. This mechanism has been deprecated. It has been replaced by a new mechanism for resolving default pictures for entities (content items, commerce items, projects, workflows, etc.) on the Studio Server. This new mechanism is customizable on different levels. For details, see the Studio developer reference documentation under "Thumbnails" > "Default Pictures".

The Studio Client logic for retrieving thumbnails (with or without transformation operations) is still in place: ThumbnailService/EditorContext#getThumbnail() and ThumbnailService/EditorContext#getThumbnailUri() .

Though deprecated, the old mechanism will stay in place. But note that only picture resolving customizations done with the new mechanism will take effect in all apps (Content App, Workflow App, Campaign App) while die old mechanism only takes effect in the Content App.

(CMS-22744)