@Override
    public List<String> getSourceConnections() {
        ArrayList<String> ret = new ArrayList<>();
        if (configSourceSet != null) {
            ret.addAll(configSourceSet.getSources());
        }
        return ret;
    }
Takes down connection(s) to config sources and running tasks
config-proxy/src/main/java/com/yahoo/vespa/config/proxy/RpcConfigSourceClient.java