PrometheusExporter in instrumentation guide is undefined

[ndarilek]

Hey, thanks for this. I attempted to use your guide for Prometheus instrumentation, but I don't see PrometheusExporter defined anywhere. I.e.:

alias MyApp.{
  PhoenixInstrumenter,
  PipelineInstrumenter,
  PrometheusExporter,
  RepoInstrumenter,
  VersionInstrumenter
}

And yes, I did replace MyApp. :)

Thanks.

[happysalada]

I need to update this guide, it's quite old. Since telemetry appeared, there are different ways of doing things.
In the meanwhile you have to check out the individual repos for prometheus integration and follow the installation there
https://github.com/deadtrickster/prometheus-ecto
(for Ecto. then there is a phoenix one)

I'm in the process of updating docs, but I'm afraid it will take a little bit of time

[happysalada]

actually I forgot to include the installation steps here
https://github.com/deadtrickster/prometheus.ex
If you replace ExampleInstrumenter by PrometheusInstrumenter on their instruction, you should be good to go

[ndarilek]

Cool, thanks for the quick reply! This compiles, but I can't call /metrics on my local app via curl. Is this only enabled in production, or is there another missing step to set up the /metrics route?

[ndarilek]

Never mind, found [this post](https://blog.smartlogic.io/monitoring-your-elixir-app-with-prometheus/) and that pointed me in the right direction. Thanks for your help!