nagstamon from server:monitoring project

需要 15.6 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/server:monitoring/15.6/server:monitoring.repo
zypper refresh
zypper install nagstamon

需要 RHEL 7 ，用 root 執行：

cd /etc/yum.repos.d/
wget https://download.opensuse.org/repositories/server:monitoring/RHEL_7/server:monitoring.repo
yum install nagstamon

需要 SLE 15 SP7 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/server:monitoring/SLE_15_SP7/server:monitoring.repo
zypper refresh
zypper install nagstamon

需要 SLE 15 SP5 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/server:monitoring/SLE_15_SP5/server:monitoring.repo
zypper refresh
zypper install nagstamon

需要 SLE 15 SP4 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/server:monitoring/SLE_15_SP4/server:monitoring.repo
zypper refresh
zypper install nagstamon

需要 SLE 15 SP3 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/server:monitoring/SLE_15_SP3/server:monitoring.repo
zypper refresh
zypper install nagstamon