Werk #16432: cisco_temperature: Handle Invalid Device Readings

Component

Checks & agents

Title

cisco_temperature: Handle Invalid Device Readings

Date

Jun 13, 2024

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.4.0b1	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.3.0p7	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.2.0p28	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Cisco SNMP devices may report temperatures of "inf" or "-inf". According to CISCO-ENTITY-SENSOR-MIB, these values are not valid.

Previously, Checkmk would treat non-finite temperatures as valid. This invalid data would be written to tmp/check_mk/counters/, which then caused the Check_MK service to become UNKNOWN. Furthermore, the services on the host would become stale. With this Werk, the problematic values not persisted. Only the affected service state will be UNKNOWN.

If you are affected, you can delete the corrupted counter file in tmp/check_mk/counters/<host name>. To fix the readings reported by your device, please directly contact Cisco.

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