Werk #16885: Crash: liebert_maintenance: ValueError("Cannot render negative timespan") when time is overdue

Component	Checks & agents
Title	Crash: liebert_maintenance: ValueError("Cannot render negative timespan") when time is overdue
Date	May 21, 2024
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0p3 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p27 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

liebert_maintenance check would crash with ValueError("Cannot render negative timespan") if the value for "Next maintenance" is in the past. This change now renders positive and negative values differently (also only printing days) adding 'overdue' if date for next maintenance is located in the past.

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