Werk #16803: Custom graphs: Fix crash in case of missing host/service/metric

Component

Metrics system

Title

Custom graphs: Fix crash in case of missing host/service/metric

Date

Apr 24, 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)

Custom graphs can contain elements whose host or service is non-existant. This happens for example when a host is removed from the monitoring after one of its metrics has been added to a custom graph. In such cases, no graph was rendered. Instead, the Checkmk UI displayed the message "Cannot calculate graph recipes" and showed a traceback.

As of this werk, the UI instead renders no lines for such elements and denotes them with "n/a" in the graph legend.

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