Here is how the software uses the "5 Crack" metric:
This article dives deep into the science of glass fracturing, the numerical classification of crack patterns, and how modern design software predicts the "5 Crack" threshold to save buildings from catastrophic failure. Window Glass Design 5 Crack
Lesson learned: If your repair team sees a 5-crack pattern, do not patch it. The pane is structurally zeroed. Here is how the software uses the "5