Werk #15639: Predictive Levels: Suppress levels if standard deviation is undefined

Component	Checks & agents
Title	Predictive Levels: Suppress levels if standard deviation is undefined
Date	Aug 25, 2023
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0p9 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p34 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p39 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This change affects users of the option In relation to standard deviation from Predictive Levels.

Predictive Levels are computed by considering every data point matching the configured reference period. If there is only a single data point available, the standard deviation is undefined. Previously, since the standard deviation was unavailable, Checkmk would use the absolute value of the reference value. In particular, if the reference value was 0, then this would result in a CRIT.

With this Werk, no levels are applied, if the standard deviation is undefined.

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