Postmortem: AI Incident Classifier Failed Due to Biased Training Data and Scikit-Learn 1.5

In Q3 2024, a production AI incident classifier mislabeled 42% of critical security incidents as 'low priority' over 72 hours, causing $2.1M in SLA breach penalties and a 19% drop in enterprise customer retention. Root cause? A toxic combination of unmitigated training data bias and silent breaking