I have an azure app service where I have deployed an ASP.Net core API. The monitor page in the app service shows 1-3 HTTP 5xx errors every few minutes even when no calls are being made to it. The image below shows the graph:

Strangely none of these errors can be seen in Azure app insights, I checked all requests and could not find any failure in the insights.

Here is what I have tried from other answers here:

1. Always on setting is not turned on. I still have controllers for ‘/’ just in case.
2. Tried to check all 5xx codes in app insights via queries, could not see any.

At this point I am stuck, any inputs would be greatly appreciated.