Signal Pollution
Lightweight events (page views, scrolls, micro-signups) are recording more than 100x the volume of your real business outcomes (purchases, qualified leads). When micro-conversions dominate the goal set, Smart Bidding learns to chase easy actions instead of revenue, and reporting drifts from pipeline reality even as conversion totals climb.
Why It Matters
When page views, signups, or other lightweight events dominate the conversion set, Smart Bidding can learn to chase easy actions instead of revenue or qualified leads. The account may show rising conversion volume while pipeline or sales do not improve. Analysts also lose a clear read on whether campaigns are moving real business outcomes.
How To Fix It
Mark micro-conversions as Secondary unless they are intentionally used for bidding. Keep the primary goal set focused on purchases, qualified leads, or another downstream action. If you need micro events for learning, isolate them in separate experiments or campaigns instead of mixing them with macro goals.
Example
Macro purchases: 42
Micro signups/page events: 7,800
Micro/macro ratio: 185xThis account has a micro to macro conversion volume ratio exceeding 100:1, meaning lightweight events such as page views, scrolls, or non-qualified signups are reporting at least 100x the volume of true business outcomes. Per Google Ads conversion goals documentation, Primary conversion actions are the actions Smart Bidding optimises toward, and concentrating Primary status on macro outcomes prevents the bidder from learning to chase easy events at the expense of revenue or qualified leads. The optimisation risk is rising conversion totals with flat or declining pipeline. Fix: mark micro-conversions as Secondary unless they are intentionally used for bidding, keep Primary goals focused on purchases or qualified leads, and isolate any micro-event learning in separate experiments or campaigns rather than mixing with macro goals. Source: support.google.com/google-ads/answer/12727548.
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References
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