For openSUSE Leap 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:sentinel/openSUSE_Leap_15.4/security:sentinel.repo
zypper refresh
zypper install czmq
For SLE 15 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:sentinel/SLE_15_SP4/security:sentinel.repo
zypper refresh
zypper install czmq
For SLE 15 SP3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:sentinel/SLE_15_SP3/security:sentinel.repo
zypper refresh
zypper install czmq
For SLE 15 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/security:sentinel/SLE_15/security:sentinel.repo
zypper refresh
zypper install czmq