Werk #22299: Entity sensors: don't crash on sensors without a sensor type

Component	Checks & agents
Title	Entity sensors: don't crash on sensors without a sensor type
Date	Sep 25, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	3.0.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0p15 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p38 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

This werk affects SNMP devices that are monitored through the ENTITY-SENSOR-MIB, such as Palo Alto, Cisco ASA, Arista and Cisco Firepower devices.

Some devices report sensors without a sensor type, for example the sensors of a transceiver slot. In this case the section entity_sensors crashed with KeyError: '', and the services Temperature, Fan and Power of the whole device got no data.

Checkmk now skips sensors without a known sensor type and monitors all other sensors of the device as before.

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