Initializing a connection string from an app service environment variable

[Jordan-Justice]

Hello. I've been trying to configure the applicationinsights serilog sink using appsettings and ReadFrom.Configuration(). However my app has run into a problem after I deploy to azure.

The readme states

A connectionString can be omitted if it's supplied in the APPLICATIONINSIGHTS_CONNECTION_STRING environment variable.

I have this environment variable configured on my app service, but Azure prefixes the environment variable name with APPSETTINGS_. Which means the environment variable my web api receives is APPSETTINGS_APPLICATIONINSIGHTS_CONNECTION_STRING and the application insights sink fails to initialize with a connection string as a result.

Have you guys encountered this scenario before? Do you have any advice for how to navigate it?

[zyofeng]

AI seems to be using APPLICATIONINSIGHTS_CONNECTION_STRING by default. I would suggest renaming the default setting name in your web app to align with this, or pass it in manually as part of the setups.
https://github.com/microsoft/ApplicationInsights-dotnet/blob/7c691ad47b9e0ff6983692ddddfd65e96798b697/BASE/src/Microsoft.ApplicationInsights/Extensibility/TelemetryConfiguration.cs#L409