Exception Occurred During App Startup
Exceptions detected in Event Logs and requests failed with 500.30 status code.
It is very likely the cause of the problem was an ASP.NET Core Logging Integration extension that Microsoft had upgraded on Mon, 26 Sep 2022 23:41:16 GMT. Microsoft now use RC version (Release Candidate) in production.
This new version of the extension broke Xink Auth dependency tree and literally killed the production application.
Mitigation: We switched deployment mode from Portable (the app uses libraries and framework provided by hosting) to Self-Contained (we copy all the libraries during every deployment). This makes us less dependent on hosting configuration. But it doesn't solve the problem as we still rely on system parts and extensions (RC-version, see above).
Next Steps : We consider two paths to follow to eliminate such issue in the future. First - resuming Kubernetes migration, moving all parts from Azure native services to our clusters. Most likely candidate. Second - move to stand-alone containers. Quick solution.