HTTP Error 500.30 - ASP.NET Core app failed to start

I've been hosted on Azure for approx. 5 years.. very stable. I run ver 4.60.4 since September and it's been great! Out of nowhere (I did no change on the site) Azure crashed my site. I now have a critical ticket open with them. So I hope they will get it resolved soon. I'll post any learnings I gain. Has anyone experienced this?

Problem solved. My app exceeded allocated SQL storage. I deleted records from log table. Simple solution but took a long time to find it!

It's very good that you managed to figure out the issue and solve it. Once you run into an application failed to start issue then you can set the stdoutLogEnabled value to true. This will create log.txt inside the Log folder which will have details on why the application failed to start. This way you can locate the problem very early and take necessary action to fix the issue.