The first major change that 0.4.0 brings is centralisation. With previous versions of the Catalogue, it’s been a requirement to have the Catalogue schema and procs installed on every server that you want to monitor.
0.4 changes that, there is now no need to have anything installed on any of the target instances. Simply install the Catalogue in one place, on your central configuration server and add any instances that you require monitored to the Catalogue.ConfigInstances table.
This makes it much easier to add in instances to the Catalogue.
There are a few other updates as well, so check them out.