Werk #16801: Custom graphs: Fix crash in case of unavailable scalars

Component

Metrics system

Title

Custom graphs: Fix crash in case of unavailable scalars

Date

Apr 23, 2024

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.4.0b1 Not yet released	Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0	Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

When adding a scalar to a custom graph, it is possible that no value is available for this scalar. For example, this is the case when adding the CRIT threshold of a metric for which no thresholds are configured. In such cases, no graph was rendered. Instead, the Checkmk UI displayed the message "Cannot calculate graph recipes" and showed a traceback.

This werk restores the correct behavior: No lines are rendered for unavailable scalars and they are denoted with "n/a" in the graph legend.

To the list of all Werks