Your PageSpeed alerts are noise: monitor real-user Core Web Vitals instead

Note: I wrote this article with help from an AI assistant. The experiments, numbers and code are mine, and I ran every snippet before publishing. I once set up "alert me when the PageSpeed score drops" monitoring for 30 sites. Within a day I was getting alerts for sites nobody had touched. So I stopped trusting the alerts and measured the noise instead. This post covers what I learned: the…