How to Test Your Website From Another Country (and Why Your Monitoring Says It's Fine)
The ticket says nobody in Brazil can log in. Your status page is green, every synthetic check passed in the last five minutes, and the last deploy went out three days ago. You run the check by hand. Still green. Then someone on the call opens the site on their phone, on mobile data, and gets a challenge page. I've watched that hour play out more than once. It's rarely a bug in the application. It's that the thing doing the checking and the person doing the complaining look like two completely different visitors to your own edge, and nothing in your stack is set up to notice.