Diagnose flapping monitors, rotating content, and single-region blips that fire alerts you can ignore.
Quick answer
Most false alerts come from three sources: single-region network blips, flapping monitors, and rotating page content. Lemwatch already filters the first two with confirmation gates and hysteresis — this article helps you tune them.
What causes false alerts
A single probe location failing while others succeed
The site returning 200 → 500 → 200 within seconds (flapping)
Response time briefly crossing a threshold, then recovering
Ads, banners, or timestamps changing on visual monitors
Third-party scripts blocking the load once
Where to check
Alerts inbox → Suppressed tab shows alerts Lemwatch caught but held back. That's your evidence base.
How to reduce false alerts
Open Alerts inbox → Suppressed and read the top 5 suppression reasons.