Prometheus metrics

I’m trying to install metrics using this guide but I have no success

My appsettings.json looks like this:
“Plugins”: [
“OpenTelemetry”: {
“Otlp”: {
“Endpoint”: “http://localhost:9090/api/v1/otlp/v1/metrics

I also added $Env:OpenTelemetry__Otlp__Endpoint = ‘http://localhost:9090/api/v1/otlp/v1/metrics

When I go to http://localhost:9090/api/v1/otlp/v1/metrics I have nothing and if I run prometheus and go to the same page I have this result

Query for http_server_duration_milliseconds_count

I have nightly build 4.2.15 (8475317850)

Am I missing something?

Thank you