@Override
    public Map<ConfigDefinitionKey, ConfigDefinition> getConfigDefinitions() {
        return Collections.unmodifiableMap(configDefinitions);
    }
A global pool of all config definitions that this server knows about. These objects can be shared
by all tenants, as they are not modified.

@author Ulf Lilleengen
config-application-package/src/main/java/com/yahoo/config/model/application/provider/StaticConfigDefinitionRepo.java