Available servers are servers in a region in a ready state that can fulfill an allocation request quickly. Having these “ready to go” servers ensures there’s always a server available to fulfill an allocation request, which prevents players from having to wait for you to scale up more servers.
Game Server Hosting keeps a collection of available servers for each region. This collection is the availability buffer. The region’s scaling settings decides the number of available servers per region.
For example, if you have a region with a minimum of one server and a maximum of five servers, you can have, at most, five servers in that region. With that in mind, the minimum and maximum available servers scaling settings control the size of the available servers buffer. Effectively, these settings decide the number of servers you want to keep online, available to allocate, in case of an increase in allocations.