Lesson 11 of 11
Reliability & Monitoring: Recap And Verify
Recap every lesson, then check your whole container in one pass.
Two patterns run through this module: a built-in trigger for the errors GTM already knows about, and the custom-event loop (a listener pushes an event, a Custom Event trigger matches it, a tag fires) for everything it doesn't, async rejections and performance metrics alike.
Export your container and verify the whole module below.
What you covered
- JavaScript Error Tracking: The JavaScript Error trigger fires a tag on gtm.pageError.
- Promise Rejection Tracking: A listener pushes unhandled_rejection so async failures get tagged too.
- Web Vitals To DataLayer: PerformanceObserver pushes web_vitals; a GA4 tag carries LCP and CLS.
Verify your whole container
Built everything in this module? Export your container (Admin → Export Container, choose your workspace) and drop the JSON here. We run every lesson's check against your single export, so you can confirm the whole module in one pass. It's checked in your browser, nothing is uploaded.
Drop your container .json here
or browse · checked in your browser, nothing is uploaded