Serilog doesn't log to Azure App Insights when deployed as an App Service

[Steve887]

I have a .Net Framework API and I am using Serilog with the Application Insights sink for logging.

I have configured Serilog with the AppInsights instrumentation key and using ILogger to trigger logging. When I run my API locally the log message show up in my App Insights Transaction search. However, when I deploy the API to an Azure App Service, the logs seem to never make it to App Insights.

I have tried updating the sink to latest, making sure the Instrumentation Key is correct but nothing seems to help.

My logging config:

var logConfig = new LoggerConfiguration()
    ReadFrom.AppSettings()
    WriteTo.ApplicationInsights(instrumentationKey, new TraceTelemetryConverter());
Log.Logger = logConfig.CreateLogger();

Then I'm using the following to test logging:

Log.Logger.Error("Log.Logger LogTest: Error");

I'm running out of ideas of where to go from here. Is there anything I'm missing?

[Ryanman]

Might be a namespace conflict, I've been dealing with this as well.
https://stackoverflow.com/questions/72722971/getting-error-when-upgrading-from-serilog-sinks-applicationinsights-v3-1-to-v4-0

I got to the error by digging into the app logs for the service under "Diagnose and Solve Problems":

Exception Info: System.InvalidOperationException: Type Serilog.Sinks.ApplicationInsights.Sinks.ApplicationInsights.TelemetryConverters.TraceTelemetryConverter, Serilog.Sinks.ApplicationInsights was not found