Query API reference

Where is the reference for the groovy query API? For example, I have a rule variable working as expected with this value:

def host = server.TopologyService.getObject(@event.get("topologyObjectID"));
return host.get("monitoredHost/name");

Now I want to get the IP in addition to the hostname. Where can I see what exactly host.get("monitoredHost") returns and what is available to query further?