How to export Telemetry to an external OTLP endpoint

[raultorrecilla]

Hi!
I am trying to configure eShop to export the open telemetry gathered natively to an external Collector that exposes both http and grpc endpoints.

In the launchSettings.json from the AppHost I commented out the DOTNET_DASHBOARD_OTLP_ENDPOINT_URL and added OTEL_EXPORTER_OTLP_ENDPOINT pointing to my local collector. I also have added the OTEL_EXPORTER_OTLP_HEADERS as my local collector requires the Authorization header.

I could not make it work. My local collector is alive and accepting data as I can reach it through curl or postman.

One interesting thing is that if I debug in AddOpenTelemetryExporters method in Extensions.cs and watch for both OTEL_EXPORTER_OTLP_ENDPOINT and OTEL_EXPORTER_OTLP_HEADERS, the first one is grabbing my configuration in the launchsettings.json but the second one is not. It is showing a header/key that starts with x-otlp-api-key=7af0.... that I could not find in the code.

Any hints how to setup this?