Werk #18745: Voltage levels (UPS / PDU / other devices): allow alerting on over-voltage

Component	Checks & agents
Title	Voltage levels (UPS / PDU / other devices): allow alerting on over-voltage
Date	Apr 13, 2026
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0b5 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p27 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The Voltage levels (UPS / PDU / Other Devices) ruleset previously only exposed lower threshold fields (warning / critical if below). It was therefore not possible to alert on abnormally high voltage readings reported by UPS, PDU and similar devices.

The ruleset now also exposes optional upper threshold fields (warning / critical at or above), matching the way the Frequency parameter behaves in related rulesets. The new fields are optional and default to unset, so existing rules and check results are unchanged unless an administrator explicitly configures upper thresholds.

The following check plugins evaluate the new upper thresholds:

• ups_in_voltage
• ups_out_voltage
• ups_socomec_in_voltage
• ups_socomec_out_voltage
• ipr400_in_voltage
• emc_isilon_power

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