You people are great. @Tomasz_Kusmierz ,@Flox.
I did;
docker ps
to check for service name,
docker exec embyserver update
then lost web-ui and emby-ui , rebooted a couple of times and did more searching and a found a post by @Flox that shed light ad applied his solution, restarting rockstor from the console; (Can't access Web UI (newbie) - #2 by Flox)
systemctl status -l rockstor
this showed that rockstor was active but still I applied;
systemctl restart rockstor
and It all went to normal.
Now, I question if I have to do this with every emby update?? I will tell when the next one comes along.