Metrics endpoint for Prometheus

[prologic]

Let's please add an /metris endpoint to service up metrics to Prometheus. We should be able to expose all of the internal stats already exposed in the UI plus all the standard Go runtime stats.

[kamontat]

Can we bring this features to live?
I can help but will need some guide.

[ReSearchITEng]

First, thank you for the wonderful adguard project!

Unfortunately the old github project https://github.com/ebrianne/adguard-exporter by @ebrianne project disappeared, and the previous docker-hub images no longer work (at least for latest adguard fail), is it possible to bring prometheus metrics back into picture?

Metrics is especially important for projects like adguard, so one can identify bottlenecks in the infrastructure, make statistics, etc.

PS: pi-hole has a very strong exporter project, and it's very actively maintained, it would be really nice to enhance this wonderful adguard project as well, especially that there are PRs like @radhus's.

[ReSearchITEng]

Found some forks of original (https://github.com/ebrianne/adguard-exporter which was deleted):
https://github.com/csfreak/adguard-exporter
https://github.com/sapslaj/adguard-exporter

There are also other older projects, but they are very limited in scope (processes only /control/stats) compared with what @ebianne' version had (see dashboard https://web.archive.org/web/20221224153716/https://raw.githubusercontent.com/ebrianne/adguard-exporter/master/grafana/dashboard.json ; it had ~19 forks).
Here are those older limited ones:
https://github.com/l13t/adguard_exporter (seems most up to date fork)
povilasv/pihole_exporter@master...darookee:adguard_exporter:master
https://github.com/darookee/adguard_exporter

[yuha0]

@ReSearchITEng The very last version from ebrianne/adguard-exporter still works with the latest AdGuardHome release for me. What was the problem you encountered?

(I don't know what happened to that project, but if the author ever come across this post, I just want to say I have used the exporter for years and got a ton of value out of it. So thank you for all the work you put into the project, and wish you all the best!)

Hi @ainar-g , (since you were the person originally linked that project in AdGuardHome's README) just FYI that this link is now 404:

AdGuardHome/README.md

Lines 466 to 468 in 1e0ff4d

	* [Prometheus exporter for AdGuard
	Home](https://github.com/ebrianne/adguard-exporter) by
	[@ebrianne](https://github.com/ebrianne).

Finally here's another +1 and hope that AdGuardHome could implement metrics natively. A metrics system is critical for long term analysis, and allows the project to integrate with tons of monitoring/alerting systems out there automagically. Also, it also paves the path for #573, which leads to better scalability and reliability.

[henrywhitaker3]

If anyone still wants this, I've just made https://github.com/henrywhitaker3/adguard-exporter for getting prometheus metrics out of adguard

[davinkevin]

Thank you @henrywhitaker3, I'll give it a try, and big +1 to have this embedded.

[metalmatze]

Hey!
I finally got a new NAS and setup AdGuard first thing. I'm surprised there aren't any Prometheus metrics for this incredible project. I'm happy to give it a try.