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The datasources used to communicate to the DB on the server and client side are all packaged into separate plugins. By default, the provided datasources are used to connect an Apache Derby database (the reason for this is because the default DB that Geronimo uses is also Derby). However, since these datasources are packaged as plugins, anyone is able to write their own datasource deployment descriptor, package it into a plugin, and use it instead of the one provided by default.
You can learn how to configure your own datasources here.
Graphs
Administrators using the console are able to create customized graphs. They are able to specify which statistic to be on which axis, in addition to the ability to perform a mathematical operation on two statistics.
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