Each swagger spec is tied to one version a.k.a api-version of the service.
{
"swagger": "2.0",
"info": {
"title": "WebSite Management Client",
"version": "2016-08-01" // <<---------------------------------The api-version
},
"host": "management.azure.com",
. . .
}
The App service RP comprises of services where each service has its own api-version. Hence, each sub-service has its own swagger spec.
All of them are tied together using this composite spec and are packaged together into one compute client library. This makes it easier for customers to download one (nuget/npm/pip/maven/gem) compute client library package rather than installing individual packages for each sub service.