The Entity module provides two new route providers aimed specifically for entities that support revisions and a bulk delete form option.

If you have an entity that implements the RevisionLogInterface interface, the revision route provider generates a user interface for managing revisions. You then add a revision entry for the router_providers array pointing to the new route provider:

 *     "route_provider" = { 
 *       "html" = "Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider", 
 *       "revision" = "Drupal\entity\Routing\RevisionRouteProvider", 
 *     }, 

Then, you just need to define additional items in your entity's links definition:

*   links = { 
*     "revision" = "/messages/{message}/revisions/{message_revision}/view",
 *     "revision-revert-form" = "/messages/{message_enhanced}/revisions/{message_revision}/revert",
 *     "version-history" = "/messages/{message}/revisions", 
*    "canonical" = "/messages/{message}", 
 *    "edit-form" = "/messages/{message}/edit", 
 *    "delete-form" = "/messages/{message}/delete", 
 *    "collection" = "/admin/content/messages" 
 *   } 

This reduces the amount of boilerplate code required to implement an Entity. For an implementation example, refer to the EnhancedEntity class in the Entity API's test module entity_module_test.