Resolution: Won't fix
Steps to reproduce:
- Have a discovery template which creates hosts and puts them in a hostgroup
- Allow Zabbix to discovery hosts and add them to the hostgroup
- Go to Configuration -> Host Groups
- Click on the hostgroup
- Click Update with or without making changes
Cannot update groups for discovered host "4c4c4544-0039-5210-8038-b1c04f304d32".
Having a host discovered and put into a Hostgroup essentially makes the hostgroup uneditable in the Host Group config page, though since the workaround allows it, and it errors whether or not a change is made, it seems to be a bug in the Host Group interface.
The hostgroup should allow the addition/removal of non-discovered hosts.
Go to the individual host configuration page, and add the host group in the In Groups section.
This works, but is quite tedious when you have many hosts to add.