Analytics Anomaly Detection: Automated Surveillance for 100+ GA4 Properties

How I built a system that monitors over 100 GA4 properties every day without manual intervention, at near-zero cost. Three-signal anomaly detection (same-day-of-week z-score, week-over-week trend with time-decaying weights, Italian holiday calendar with dynamic Easter), an AI layer over 90 days of historical data, and Telegram notifications. What you miss manually, this catches.

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Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2026-05-22
DOI
https://doi.org/10.5281/zenodo.20338197
Primary Topic
Anomaly Detection Techniques and Applications
Type
preprint
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preprint

Analytics Anomaly Detection: Automated Surveillance for 100+ GA4 Properties

Claudio Novaglio
Zenodo (CERN European Organization for Nuclear Research)
Anomaly Detection Techniques and Applications
preprint

Analytics Anomaly Detection: Automated Surveillance for 100+ GA4 Properties

Claudio Novaglio
preprint en

Abstract

How I built a system that monitors over 100 GA4 properties every day without manual intervention, at near-zero cost. Three-signal anomaly detection (same-day-of-week z-score, week-over-week trend with time-decaying weights, Italian holiday calendar with dynamic Easter), an AI layer over 90 days of historical data, and Telegram notifications. What you miss manually, this catches.

Zenodo (CERN European Organization for Nuclear Research)
Zone Atelier Moselle (FR)
Anomaly Detection Techniques and Applications
DOIOpen Access PDFOpenAlex
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