This package provides full monitoring of remote NUT (Network UPS Tools) devices via Checkmk 2.5 (tested with this version) using the modern Agent-Based API v2 and Rulesets API v2. So it may actually be comaptible with version 2.3+.
It supports:
Monitoring multiple UPS devices per host
One Checkmk service per UPS
Thresholds configurable via WATO ruleset
Perfdata for graphing (battery, voltages, frequency, load, temperature)