Werk #5273: Fix display of CustomGraphs for metrics without current performance data

Component	Metrics system
Title	Fix display of CustomGraphs for metrics without current performance data
Date	Feb 15, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i3 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p25 Checkmk Enterprise (CEE), Checkmk MSP (CME)

The graphing system was unable to display metrics within a custom graph if the corresponding performance-data is currently not available. This would for example be the case if a check isin a temporary "Unknown" state.

The rendering now correctly relies on the corresponding historical metric data instead of discarding the metric completely.

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