[nikita]

One of the services that can replace the fauna service is DocumentDB Postgres plugin (+proxy that is not open sourced yet, but will be shortly). It's available on Azure, but I can also see other Postgres Providers will start picking this up.

https://github.com/microsoft/documentdb

[adobrawy]

There is an open-source proxy for PostgreSQL with DocumentDB to implement the MongoDB interface: https://blog.ferretdb.io/ferretdb-v2-ga-open-source-mongodb-...