We've looked into monitoring Oracle ExaData using an ActiveGate plugin. The challenge we ran into is the lack of an Oracle provided dev environment. If you're interested in getting help with building a plugin for ExaData and we're able to use your environment for the development and testing, reach out to your Dynatrace account manager.
Nothing came out of it so far. You can sign up for the preview of the Oracle insight program to get data from the Oracle database. However, to get statistics about the ExaData components it'd still be up to yourselves or a joint development effort.