Notes on GTM dataLayer drift: how to catch it before it costs you
dataLayer drift kills attribution silently. After auditing 12 stacks last year, here's the failure pattern I see most - and the cheapest way to detect it.
Placeholder content. Full technical note coming soon.
dataLayer drift is the silent failure mode of GTM-driven measurement. Your code ships fine, your tags fire, your reports look reasonable - and somewhere in the middle, a field name changed and you don’t know it for a quarter. By then your attribution is off and you’re making spend decisions on shifted ground.
Full pattern + the simple monitor I run on every implementation - coming shortly.