**To describe all Amazon DocumentDB event categories** The following ``describe-event-categories`` example lists all categories for the Amazon DocumentDB event source type ``db-instance``. :: aws docdb describe-event-categories \ --source-type db-cluster Output:: { "EventCategoriesMapList": [ { "SourceType": "db-cluster", "EventCategories": [ "failover", "maintenance", "notification", "failure" ] } ] } For more information, see `Viewing Event Categories <https://docs.aws.amazon.com/ documentdb/latest/developerguide/managing-events.html#viewing-event-categories>`__ in the *Amazon DocumentDB Developer Guide*.