Expose Prometheus metrics

[guidoiaquinti]

It would be good to integrate the Prometheus client library to expose Orchestrator metrics like we already do for graphite.

I know that we expose the same metrics in expvar-like format via /debug/metrics but that's not exactly Prometheus compatible (see related discussion in the gh-ost repo).

I'm opening this issue to keep track of this enhancement.

Thank you!

[shlomi-noach]

@guidoiaquinti are you suggesting to add promotheus metrics? Otherwise how should this be done?

[guidoiaquinti]

My suggestion is to add an HTTP route (e.g. /metrics) that can expose Orchestrator metrics in a Prometheus compatible format.

Here's a list of some third-party software natively exposing metrics in the Prometheus format.

[shlomi-noach]

@guidoiaquinti thanks :) I meant to ask whether you intend to implements us or want us to.

I'm not familiar with promotheus and this isn't on my immediate roadmap; given that I'll need to invest learning promotheus/metrics, I'm unlikely to do this in the near future.

[guidoiaquinti]

Sorry for the misunderstanding @shlomi-noach 😄

I've opened this issue only to keep track of the enhancement. I don't think I'll have time in the near future to implement it and it's currently not a high-pri for us.

[shlomi-noach]

Cool. Thank you!

[ameetkotian]

PR for review #1414