Tomorrow quiet BAC control uses a three-part instrumentation triad: GA4 real-time monitoring for active users per minute/page views/session starts, screenshots at T0/T+15/T+30 for visual capture of ephemeral GA4 data, and referrer data tracking where traffic originates (coordination-driven vs organic). This triad addresses GA4 key limitation (data is ephemeral, not retrospectively queryable at minute granularity) through screenshot preservation. Referrer data is particularly important for distinguishing coordination-driven traffic from organic traffic. Without referrer data, any observed spikes are ambiguous in origin.