Stream Hosts are grouped into different Collections, which are created and maintained in Data Stream Designer. A Collection can be defined as a Category that contains a set of Stream Hosts that run the same Data Streams. Each Stream Host is associated with a Collection by keeping the ID of the Collection in the appsettings.json file of the Stream Host, which can be found in the location where the Stream Host has been installed. Thus, all the Stream Hosts that have the same Collection ID stored in this file, will automatically fall under the Collection that has that ID.