Checkmk special agent + check plugins that monitor a Hermes Agent installation through its web dashboard's public REST API

Checkmk MKP that monitors OPNsense firewalls through the OPNsense REST API. Not an replacement for the checkmk agent, but an addition.

Checkmk MKP that monitors a Proxmox Mail Gateway (PMG) node through its REST API. Not meant as an replacement for the Linux agent, but as an addition.

Checkmk check plugins that monitor the PowerDNS Authoritative Server and the PowerDNS Recursor through their built-in HTTP APIs, with a control-socket fallback (pdns_control / rec_control) when the API is unavailable.

Checkmk special agent + check plugins that monitor a Proxmox Backup Server (PBS) through its REST API. Not meant as a replacement for monitoring via the Checkmk agent, but as an addition.

Checkmk MKP that monitors the ZFS Adaptive Replacement Cache (ARC) on a Linux host with ZFS installed.

Checkmk special agent that monitors an openWB wallbox controller through its read-only simpleAPI HTTP endpoint. Not meant as a replacement for the Linux agent, but as an addition.

Checkmk special-agent plugin that monitors the DNS-based mail security posture of one or more domains, plus a bundled overview dashboard.

Checkmk special agent that queries a Home Assistant instance and creates Checkmk piggyback hosts grouped by Home Assistant area/room, with one service per imported entity.

Checkmk MKP that monitors the DNSSEC status of arbitrary domains. It runs entirely from the Checkmk site — no agent needs to be deployed on the monitored host, and it has no Python dependencies (pure standard library, no dnspython).