Cloudflare Health Check - Down | No failures

I have health checks configured for many websites, and this morning my mailbox is loaded with a lot of health check notifications:

You can see that all of them are down because of “No failures”. Well… thanks for the “useful” message.

So I dig into Health Check Analytics for some zones, and here’s what I found:

Some of them getting response code 0, and some of them getting response code 523. But the failure reason is “No failure” and the website is still accessible.

Anyone having the same problem? Is it just a bug?

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