This likely involves adding an additional parameter to the Mongo object constructor and forwarding the metadata to the underlying DBClient instance.

Connection handshake

The isMaster handshake, as of MongoDB 3.4, supports a new argument, client, provided as a BSON object. This object has the following structure::

{
    isMaster: 1,
    client: {
        /* OPTIONAL. If present, the "name" is REQUIRED */
        application: {
            name: "<string>"
        },
        /* REQUIRED, including all sub fields */
        driver: {
            name: "<string>",
            version: "<string>"
        },
        /* REQUIRED */
        os: {
            type: "<string>",         /* REQUIRED */
            name: "<string>",         /* OPTIONAL */
            architecture: "<string>", /* OPTIONAL */
            version: "<string>"       /* OPTIONAL */
        },
        /* OPTIONAL */
        platform: "<string>"
    }
}

https://github.com/mongodb/specifications/blob/5499fd336aaa8d91bdd7cb285fa661f512be72dd/source/mongodb-handshake/handshake.rst#connection-handshake