C

checkmk

A Checkmk extension that ships a single command-line tool, mkp-cleanup, to find and clean up outdated and duplicate MKPs (Checkmk extension packages) on a site.

cmktop - top for Checkmk. A live terminal view of a Checkmk server and its sites: core load, fetcher/checker usage and latency, host and service states, processes per Checkmk role, slowest checks, tmpfs, background jobs, crash reports and logs. A single static binary built from the Go standard library only, strictly read-only, for root (all sites) and site users. Ships as MKP.

Checkmk extension for a Discourse forum run with discourse_docker: container, installed version against the release channel (latest, release, ESR) including missing security backports, DNS and SMTP from inside the container, Sidekiq, Redis, PostgreSQL, backups, admin dashboard problems and disk space - one docker exec per run, no API key.

A Checkmk special agent for Zigbee2MQTT: bridge, coordinator and health report, plus one service per Zigbee device (last seen, link quality, battery, availability, firmware updates) - via the frontend WebSocket API or MQTT, optionally as piggyback hosts.

Checkmk agent for Alpine Linux as a signed apk (OpenRC service, apk update and OpenRC service checks, optional Docker/logwatch/Vaultwarden/AdGuard plugins) plus an MKP to enable agent plugins per host via a Setup rule - no Agent Bakery needed. Signed apk repository: https://checkmk-alpine-agent-6f009d.gitlab.io

See https://gitlab.com/checkmk1/checkmk_alpine_agent/ for the installation steps.

Checkmk 2.5 extension that monitors TCP/UDP connections per local port (ESTABLISHED plus optional LISTEN, TIME_WAIT, CLOSE_WAIT, … with per-state thresholds and graphs). Ships its own agent plug-ins for Linux, AIX, Solaris and Windows, deployable via the agent bakery.

Agent-based Docker monitoring. A single agent plugin talks to the local Docker socket without the need to install anything from pip.

A Checkmk special agent for OpenDTU and OpenDTU-OnBattery photovoltaics gateways.

Checkmk agent plugin (Linux + Windows) that watches directories and alerts when one grows too fast - size, file count and growth per subdirectory, with fixed or predictive levels.

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.

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 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.

Checkmk extension for pending system/package updates on Linux (apt, dnf/yum, zypper, apk) and Windows (Windows Update, winget): security vs. normal updates, update cache age, reboot required and service restart needed - language-independent, never triggers repository rate limiting. Live-tested on 23 Linux distribution versions and Windows 11 / Server 2016 / 2022.

Checkmk special agent to monitor a NetBox installation through its REST API, without installing any agent on the NetBox host. Targets Checkmk 2.5.0 and NetBox 4.x.

Checkmk special agent and check plugins for HomematicIP devices, queried from the eQ-3 cloud REST API.

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

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.