Downdetector and the real cost of no upstream dependencies

**Downdetector and the real cost of no upstream dependencies**

The below is one out of five topics from The Pulse #154. Full subscribers received the below article two weeks ago. To get articles like this in your inbox, every week, subscribe here.Many subscribers expense The Pragmatic Engineer Newsletter to their learning and development budget. If you have such a budget, here’s an email you could send to your manager.One amusing detail of the November 2025 Cloudflare outage is that the realtime outage and monitoring service, Downdetector, went down, revealing a key dependency on Cloudflare. At first, this looks odd; after all, Downdetector is about monitoring uptime, so why would it take on a key dependency like Cloudflare if it means this can happen?Downdetector was built multi-region and multi-cloud, which I confirmed by talking with Senior Director of Engineering, Dhruv Arora, at Ookla, the company behind Downdetector...

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