Are there any docs for outputting PromEx data to Fly’s built in Grafana instance? I couldn’t get my metrics to show up in Grafana. - ThreadSky

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mikewilson.dev • 104 days ago

Are there any docs for outputting PromEx data to Fly’s built in Grafana instance? I couldn’t get my metrics to show up in Grafana.

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akoutmos.bsky.social•104 days ago

I think that this blog post that I wrote for Fly covers exactly that topic https://fly.io/blog/monitoring-your-fly-io-apps-with-prometheus/. Let me know if you need any help :)

mikewilson.dev•104 days ago

Thanks, that helped! I think the piece I was missing is using the same port for metrics that my app is using. Also, I may have missed it, but now I can hit https://myapp.com/metrics from my browser and can see the output. Is there a way to protect that publicly, or only make it available internally?

peterullrich.com•104 days ago

yes, the blog post that i linked explains all that :)

peterullrich.com•104 days ago

sorry, or did you mean how to do it in PromEx? Because the blog post talks about Peep, which is the library that exposes your Prometheus metrics. The post gives an option for how to run a second bandit server that hosts the metrics on port 9091, which your app doesn't expose publicly by default

peterullrich.com•104 days ago

PromEx mentions some options in the Security Concerns section though: https://github.com/akoutmos/prom_ex?tab=readme-ov-file#security-concerns

mikewilson.dev•104 days ago

Thanks - yeah, mostly looking how to do this with PromEx and Fly. I'm not sure how to protect that endpoint but still allow Fly to scrape it internally.

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