There are 2 repositories under icinga-plugin topic.
A shell script (that can be used as a Nagios/Icinga plugin) to check an SSL/TLS connection.
Nagios/Icinga/Sensu plugin to check current server's RAID status ⛺
:penguin: Nagios-compatible Plugins for Linux
A Python class library which helps with writing Nagios (Icinga) compatible plugins.
Icinga2/Nagios plugin for checking domain expiration
This systemd check for nagios compatible monitoring systems will report a degraded systemd to your monitoring solution. It can also be used to monitor individual systemd services and timers units.
Moodle health checks for load balancers / nagios
CheckSyno - Icinga (Nagios, et al) Synology monitoring plugin
Here i put some created or modified monitoring plugins voor nagios/opsview/icinga
Monitoring plugin to check automatic updates (unattended-upgrades) on Debian / Ubuntu.
Monitoring plugin for MikroTik devices for Icinga/Nagios/...
Nagios plugin for check fail2ban status and jails.
Monitoring plugin to check HAProxy with Icinga, Nagios and other compatible monitoring solutions
A Nagios / Icinga plugin for checking product synchronization within Katello/Red Hat Satellite 6.x
Some Nagios plugins
Nagios plugin to monitor Cisco IronPort Email Security Appliances via SNMP
Monitoring plugin to check how long ago the last snapshot of a ZFS dataset was created.
A script for presenting information about Cisco devices with SNMP. Written to work as a plugin for Op5/Nagios but can have other uses.
Nagios plugin to check for outdated OS release
Nagios-Checks for monitoring NetApp 7-Mode-Systems via NetApp Perl API
Gentoo Overlay for Icinga2 checks
Monitoring plugin to check Sophos XG firewalls with Icinga, Nagios and other compatible monitoring solutions
Monitoring Plugin to check the health of an InfluxDB
monitoring plugin for jetbrains floating license server (written in golang)
Icinga2/Nagios check for Out of memory problems
A Nagios / Icinga plugin for checking sync states of repositories managed by Spacewalk, Red Hat Satellite 5.x or SUSE Manager
Monitoring plugin to check network interfaces with Icinga, Nagios and other compatible monitoring solutions
Monitoring plugin to check how long ago the last ZFS scrub was performed.
Check OpenBGPD sessions Nagios|Icinga|shinken|etc plugin
Novell DirXML 1.1 and Micro Focus (formerly NetIQ) Identity Manager 2.x/3.x/4.x driver state detector plugin for Nagios and Icinga - basically a wrapper for "dxcmd -getstate".
A Nagios / Icinga plugin for monitoring APC UPS devices using apcupsd
A Nagios / Icinga plugin for checking the amount of connected OpenVPN users
Extra SNMP Monitoring Check Plugins for Nagios, Icinga and Icinga2.
Monitoring plugin to check disk io with Icinga, Nagios and other compatible monitoring solutions
Monitoring plugin to check JSON from REST APIs and files with Icinga, Nagios and other compatible monitoring solutions