Tried again before I wrote the comment above:
dnf install https://packages.icinga.com/epel/icinga-rpm-release-8-latest.noarch.rpm
dnf config-manager --set-enabled powertools
dnf install ‘dnf-command(config-manager)’
dnf install epel-release
dnf install nagios-plugins-all
All statements stated that there is nothing to do as everything is already installed. As far as I can remember I used icingaweb2-module-director-1.8.1.tar.gz.
But I struggled with the installation process in the beginning and it could be possible that I did something different. I’m new to Icinga and if there is an alternative way I would be happy to do things differently.
After your hint with Gitlab I found a fix that looks like it addresses my issue (GitHub - Icinga/icingaweb2-module-director at fix/serviceset-uuid). I will try to update my director installation.
Thanks for your help so far, Klaus