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	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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