C

checkmk

A Checkmk agent for Alpine Linux, packaged as a single signed .apk, plus a Checkmk extension (MKP) that lets you assign individual agent plugins/local checks to hosts through a normal Setup rule - without relying on Checkmk's native Agent Bakery, which supports neither an Alpine/apk target format nor (in its Raw Edition form) execution at all.

A Checkmk agent plugin and check plugins that monitor a self-hosted LanguageTool HTTP server — developed against LanguageTool 6.6 on Ubuntu 24.04, with the ngram (de/en/es) and fastText language models enabled — for functional health, not just reachability.

A Checkmk extension that ships a single command-line tool, mkp-cleanup, to find and clean up outdated and duplicate MKPs (Checkmk extension packages) on a site.

A Checkmk extension that monitors the number of established TCP/UDP connections per local port — e.g. "alert if a service's connection count drops to zero" or "alert if a listener is being hammered with far more established connections than usual".

A Checkmk Special Agent that monitors Anker SOLIX Solarbank battery systems — developed against a Solarbank 2 E1600 Pro — through the Anker Power/Solix cloud API (the same API the Anker mobile app uses).

A Checkmk special agent plus check plugins to monitor GitLab through its REST API (v4) — both self-hosted (CE/EE) and GitLab.com (SaaS) — built in the style of the bundled Jenkins special agent.

A Checkmk extension that monitors TP-Link Tapo smart-home devices — P110 smart plugs and, in principle, C200/C210/C720 cameras — over the local network.

A Checkmk Special Agent that lists every MKP extension package installed on a Checkmk site and checks each one's "Download-URL" for a newer release — on GitHub, GitLab, Gitea/Forgejo, or any other git server, including one reachable only on a local/offline network. One service, "MKP Updates", is created per host, with the number of available updates in the summary and a full package table in the service details.

HomeMatic CCU-Jack is a Checkmk extension for monitoring HomeMatic CCU3 and OpenCCU systems through the CCU-Jack REST API. It automatically discovers climate sensors, power meters, window and door contacts, radio duty cycle, carrier sense, and device health data. The extension supports both classic HomeMatic and HmIP devices by detecting channels, channel types, and available parameters. It also adds CCU hardware/software inventory data and a detailed HomeMatic device inventory table.

A Checkmk extension for monitoring Homematic CCU2, CCU3, and RaspberryMatic systems through a lightweight TCP agent add-on running on the CCU. It monitors CCU information, service messages, low-battery and unreachable devices, radio duty cycle, climate channels, power plugs, and door/window contacts. Configurable thresholds, metrics, graphs, and perfometers support meaningful alerting and operational visibility. The add-on supports Checkmk 2.4 and 2.5 and is installed manually on the Homematic controller, independently of the Checkmk Agent Bakery.

A modern Checkmk extension for monitoring UniFi Network controllers, switches, access points, gateways, and connected clients through the UniFi HTTPS API. It provides controller, device, uptime, interface, PoE, Wi‑Fi, LLDP, client, and inventory monitoring, with optional piggyback data for sites, devices, and endpoints. The add-on supports Checkmk 2.4.0p19 through 2.5.x and uses current Checkmk plug-in APIs. It includes configurable UDM-Pro support, TLS validation, site selection, and flexible client host naming for DCD-based automation.

This Checkmk add-on monitors LANCOM xDSL interfaces via SNMP. It collects line status, data rates, signal-to-noise ratio, attenuation, and current DSL connection duration. Each synchronized line receives its own service with suitable metrics, graphs, and optional thresholds.

Teltonika Router SNMP-Check

A checkmk notification plugin that extends the foobar teleprompter with wato fields. You can use this plugin to build your own custom plugin or just to see whats going on.

Checkmk curses interface

My collection of adjusted checkmk Plugins. Hopefully I don't forget the original sources..