Getting proactive alerts from ecommerce data means configuring your analytics system to detect significant changes in key metrics and notify you automatically, before you think to check, before the problem compounds, and before the cost exceeds what a timely response would have prevented. The alternative is reactive monitoring: opening dashboards when something feels wrong, which means every problem you catch is one that already ran for hours or days before you noticed it. At $30,000 per month in ad spend, a campaign that breaks on a Friday night and gets caught on Monday morning has cost you approximately $6,000 in wasted spend over the weekend. Proactive alerts close that gap. This guide covers exactly what alerts to configure, what thresholds to set, and what infrastructure makes them reliable rather than noisy.