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"Yesterday everything worked, today GA4 shows zero traffic." Tracking breaks suddenly for reasons that have nothing to do with your site's actual traffic. The fragility comes from client-side JavaScript tracking depending on dozens of external systems all functioning perfectly simultaneously. Server-side tracking eliminates most sudden breakage by moving tracking logic from browsers (controlled by users, ad blockers, and browser vendors) to your infrastructure (controlled by you). Common WordPress Breakage Causes Plugin conflicts: WordPress or WooCommerce update changes how hooks fire. Your tracking plugin expects old hook timing, doesn't capture events. Theme changes: New theme version doesn't include tracking code placement. Scripts don't load. Consent plugin updates: Cookie consent plugin changes how it blocks scripts. Suddenly blocks GA4 when it didn't before. Caching issues: CDN or caching plugin serves old HTML without updated tracking code. Your dashboard shows zero traffic but logs show normal server activity. JavaScript errors: Unrelated plugin throws...