CentOS 7
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Nagios 4 : Add Monitoring Target Item2016/09/15

It's possible to add monitoring Target Items. There are many RPM packages for them or it's possible to create a plugin by yourself. And also there are many plugins provided by comunity below.
⇒ http://exchange.nagios.org/
[1] Many plugins are provided with RPM packages like follows.
# use EPEL repo

[root@dlp ~]#
yum --enablerepo=epel search nagios-plugins-

nagios-plugins-all.x86_64 : Nagios Plugins - All plugins
nagios-plugins-apt.x86_64 : Nagios Plugin - check_apt
nagios-plugins-bdii.x86_64 : Nagios Plugin - check_bdii_entries
nagios-plugins-bonding.x86_64 : Nagios plugin to monitor Linux bonding interfaces
nagios-plugins-breeze.x86_64 : Nagios Plugin - check_breeze
nagios-plugins-ups.x86_64 : Nagios Plugin - check_ups
nagios-plugins-users.x86_64 : Nagios Plugin - check_users
nagios-plugins-wave.x86_64 : Nagios Plugin - check_wave
[2] For example, add check_ntp plugin to monitor time difference between the system and NTP server.
[root@dlp ~]#
yum --enablerepo=epel -y install nagios-plugins-ntp
[root@dlp ~]#
vi /etc/nagios/objects/commands.cfg
# add follows to the end

define command{
        command_name    check_ntp_time
        command_line    $USER1$/check_ntp_time -H $ARG1$ -w $ARG2$ -c $ARG3$

[root@dlp ~]#
vi /etc/nagios/objects/localhost.cfg
# add follows to the end ( Warning if it has 1 sec time difference, Critical if it has 2 sec )

define service{
        use                             local-service
        host_name                       localhost
        service_description             NTP_TIME
        check_command                   check_ntp_time!ntp1.jst.mfeed.ad.jp!1!2
        notifications_enabled           1

[root@dlp ~]#
systemctl restart nagios

[3] It's possible to view the status for a new plugin on the admin site.
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