Microsoft Defender for Cloud now has a new offering with Defender for Azure Cosmos DB in preview.
Threat detections are based on Microsoft Defender behavioural models, Microsoft Threat Intelligence and the Microsoft Defender SQL query analysis engine.
You can read a full list of threat detection alerts available for Azure Cosmos DB here Reference table for Azure Cosmos DB security alerts in Microsoft Defender for Cloud.
Though each database type does need a tailored and optimised approach, the security experience is standard within Microsoft Defender for Cloud. This means you can secure your SQL databases, Maria DB and now also Azure Cosmos DB databases all from within the Defender dashboard.
Enable protection at the resource or subscription level or for all database types with one click. Full instructions are available here: Enable database protection for your subscription – Microsoft Defender for Azure Cosmos DB.