GA4, Meta Pixel & Custom Monitoring System

為什麼這個專案存在

我負責的部分

• GA4 implementation and event tracking setup
• Meta Pixel integration (client-side)
• Meta Conversion API integration (server-side pixel, bypasses browser blockers)
• Apps Script development — pulled GA4 data via GA4 Data API across multiple property IDs
• Built conditional alert logic: different events and thresholds trigger different warning emails
• Built trigger-count monitoring: tracks how many times each event fires, alerts on anomalies
• Built zero-activity (cold-spot) warning emails for purchase and event silence
• Built monthly report emails sent to different responsible PMs per product
• Built self-monitoring: API trigger error emails sent to myself when tracking calls fail

困難之處

• Each product has its own GA4 property ID — the monitoring script had to handle multiple properties and route alerts to the right PM, not a single inbox
• Meta Pixel alone is blocked by ad blockers and browser privacy settings — Conversion API was needed to ensure server-side event delivery for accurate conversion data
• Defining meaningful alert thresholds is a judgment call: too sensitive creates noise, too loose misses real problems
• Zero-activity needs to be tracked as a cumulative signal, not just a one-time check — a single silent day might be a timezone gap, three consecutive silent days is a real alert
• Apps Script has execution time and quota limits — the monitoring queries had to be efficient enough to run within those bounds
• Verifying that tracking and API calls are actually firing correctly is its own problem — needed a self-alerting system for when the monitor itself fails

如何完成

1. 1Implemented GA4 event tracking across product surfaces (web, web view)
2. 2Integrated Meta Pixel client-side and Meta Conversion API server-side for complete conversion coverage
3. 3Wrote Apps Script to query GA4 Data API across all product property IDs
4. 4Built conditional alert logic: event name + count + threshold combinations trigger different email templates
5. 5Built zero-activity accumulator: tracks consecutive days of silence per product, escalates after threshold
6. 6Built monthly report generator: summarises key events per property, sends to assigned PM
7. 7Built API error handler: logs failed tracking calls, sends alert email to myself for investigation
8. 8Iterated on alert thresholds and email copy based on real traffic patterns and PM feedback

背後的思考

精選視覺

抽象示意圖——原創 mockup，非客戶截圖。

改變了什麼

• GA4 and Meta Conversion API giving more complete conversion data than pixel alone
• PMs receiving daily/conditional alerts for the specific products they own, not a shared inbox
• Monthly reports automatically generated and sent without manual effort
• Zero-activity alerts catching product-health issues before they surface in business reviews
• Self-monitoring catching tracking failures that would otherwise go undetected

我的收穫