DocumentDB customers, welcome to Azure Cosmos DB
DocumentDB is now a part of Azure Cosmos DB. With this move, all of your existing DocumentDB resources in the Azure portal are available as Azure Cosmos DB resources. Azure Cosmos DB also supports graph and key/value data models, in addition to the document data model available through the DocumentDB API and MongoDB API.
Azure Cosmos DB offers the same SLAs and pricing as DocumentDB, but with expanded features and functionality. All of your resources remain unchanged, so your DocumentDB applications will continue to work. There are no changes you need to make.
To learn more about Azure Cosmos DB, see the Dear DocumentDB customers, welcome to Azure Cosmos DB! blog post.