Your scraper isn't broken. The site changed, and it didn't tell you.

A scraper ran successfully for weeks, but an A/B test shifted the price element and silently produced many null prices.

The article warns that exit codes alone miss semantic failures when markup changes break extracted data.

It recommends validating outputs with fill-rate checks and rolling baselines to catch markup drift early.

This matters because bad scraped data can flow into warehouses and dashboards, misleading downstream decisions.