I am exploring the code of blockstack-core and I have done with blockstack-core. So, currently, I am looking into the integration-tests repo which is in the blockstack-core. so first I am reviewing the code of the Subdomain Registrar, Transaction Broadcaster, Gaia Hub. I am curious to know how blockstack is currently managing its infrastructure. I mean there are 3 different servers for Subdomain Registrar, Transaction Broadcaster, Gaia Hub or it is managed by a single server. because I want to run the integration test and it has a step to set up all these things. so I just wanted to know what will be good? either to keep them all in a single server or keep them all in a different server.