For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:trenn/openSUSE_Tumbleweed/home:trenn.repo
zypper refresh
zypper install collectd-plugin-ipmi
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:trenn/16.0/home:trenn.repo
zypper refresh
zypper install collectd-plugin-ipmi
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:trenn/15.6/home:trenn.repo
zypper refresh
zypper install collectd-plugin-ipmi