public static Context create(Set<InstanceName> instances,
                                     Set<Environment> environments,
                                     Set<RegionName> regions,
                                     Set<CloudName> clouds,
                                     Tags tags) {
            return new Context(instances, environments, regions, clouds, tags);
        }
Represents environments, regions, instances, clouds and tags in a given context.
config-application-package/src/main/java/com/yahoo/config/application/OverrideProcessor.java