Root cause (suspected)
All three probes received HTTP 403 simultaneously across three continents. This rules out a geographic block or a regional network issue. The request reached the edge (0.75 s response time) and was answered with a forbidden status, which points to a deliberate access policy rather than infrastructure failure.
The most likely cause is bot detection or rate-limiting at our CDN layer (Yandex Cloud CDN) that identified BetterStack's Better Stack Better Uptime Bot Use...