public String getServerGroup() {
        return metaInfo.getServerGroup();
    }
@author Argha C
@since 2/25/21

placeholder to mimic metainfo for a non-Eureka enabled server.
This exists to preserve compatibility with some current logic, but should be revisited.
zuul-discovery/src/main/java/com/netflix/zuul/discovery/SimpleMetaInfo.java