presto-resource-group-managers/src/main/java/io/prestosql/plugin/resourcegroups/ResourceGroupManagerPlugin.java/ResourceGroupManagerPlugin/getResourceGroupConfigurationManagerFactories
class ResourceGroupManagerPlugin:    @Override
    public Iterable<ResourceGroupConfigurationManagerFactory> getResourceGroupConfigurationManagerFactories()
    {
        return ImmutableList.of(
                new FileResourceGroupConfigurationManagerFactory(),
                new DbResourceGroupConfigurationManagerFactory());
    }