Flags a campaign whose cost per acquisition jumps well above its recent average and stays there. Two protections keep it honest: it requires the spike to hold for consecutive days (one bad afternoon never fires it), and it uses lag-adjusted conversions - the most recent days are ignored so conversions can settle before judging, so today's incomplete data can't look like a fake spike.
CPA multiplier - how many times above the baseline CPA triggers the alert. Default 1.5×, adjustable 1.1-5×.
Must hold for - consecutive days the spike must persist. Default 2 days.
Conversion lag - the most recent ~3 days are excluded automatically while conversions settle.
Minimum conversions - reliability floor; campaigns with fewer baseline conversions won't fire. Default 5, adjustable 1-50.
Checks daily against a 29-day average; 24-hour cooldown.
