Hey yinz, I’m trying to add some Prometheus metrics to Koha. This looks like it has what we want:
https://metacpan.org/pod/Plack::Middleware::Prometheus::RequestTimes

Really, I’d like response times per script, but I’m not that picky just yet.

I tried this on /etc/koha/plack.psgi but I just get a 404 for 127.0.0.1:8081/metrics. No errors in the logs. Any thoughts?

Here's my POC commit:
https://github.com/bywatersolutions/bywater-koha-devel/commit/472436f7a05a8ae5049cd8f140ba43e8a71bce8c

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ByWater Solutions ( http://bywatersolutions.com )
Meadville Public Library ( http://www.meadvillelibrary.org )
Crawford County Federated Library System ( http://www.ccfls.org )