For 15.7 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:interstar001:Icings2-2.13/15.7/home:interstar001:Icings2-2.13.repo
zypper refresh
zypper install icinga2
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:interstar001:Icings2-2.13/15.6/home:interstar001:Icings2-2.13.repo
zypper refresh
zypper install icinga2
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:interstar001:Icings2-2.13/15.5/home:interstar001:Icings2-2.13.repo
zypper refresh
zypper install icinga2
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:interstar001:Icings2-2.13/15.4/home:interstar001:Icings2-2.13.repo
zypper refresh
zypper install icinga2