Werk #19472: Fix false CRIT for NetApp temperature sensors without transceivers

Component	Checks & agents
Title	Fix false CRIT for NetApp temperature sensors without transceivers
Date	Apr 1, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.5.0b4 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0p26 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0p47 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

The netapp_ontap_temp check incorrectly reported CRIT for temperature sensors on NetApp ONTAP systems where DAC cables are used instead of optical SFP transceivers, or where SSDs have no temperature sensors installed.

NetApp firmware reports these ports as installed: true even when no transceiver is present, and returns state: error with temperature: null and all thresholds null. This seems a firmware/API limitation: the hardware detection does not distinguish between "not installed" and "error".

The check now only monitors sensors that report an actual temperature value and at least one threshold. DAC-only sensors are silently ignored, eliminating the false CRIT state.

If you have existing services showing CRIT for such sensors, they will disappear after the next check.

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