In the dashboard, I see the number of error 5xx is increasing in the “Account Analytics”. I research in Cloudflare doc and I see that it’s possible to have more information with Network Error Logging. According to this article https://developers.cloudflare.com/network-error-logging/how-to/, it’s in Analytics > Origin Reachability. But in my dashboard I don’t see this menu. I don’t know if this is because I’m using the free plan or not. But according to the article https://developers.cloudflare.com/network-error-logging/get-started it’s available for all plans.
At this time, NEL Dashboard Analytics still seems to be in an Enterprise-only beta. Any customer can enable NEL Analytics, but they cannot view them. As I understand it, Cloudflare uses them internally to track issues with connections.
Don’t fret though, there are a lot of other ways to track down 500 errors, and NEL is more for client → Cloudflare issues, which you wouldn’t see in Account Analytics at all if that was happening. I would first start by looking at your web server’s logs, and any error monitoring you have.
If the amount is very low, there was an incident causing 500 errors in a small subset of requests a few days ago: