About

Configuration to use json-exporter for Prometheus to scrape metrics from Prusa3D Mini/

This was created as alternative to pstrobl96/prusa_exporter, because I tried to use it when it was supporting only newer firmware. So I decided to try json-exporter.

Known limitations

Works with Prusa Mini+ firmware 4.4.1 and 5.1.2 (and probably anything in between of those versions), but should be easy to adjust to other printers, if they expose certain data over API in JSON format.
for now it supports only one printer instance (especially in dashboard), because I have only one printer. Feel free to create PR.
prometheus scrapes printer status every second, doing it more frequently becomes problematic, and even this sometimes can lead to missing metrics

Directories

k8s helm values file to use, you need prometheus-operator to use ServiceMonitors.
grafana, json-exporter and prometheus are used by docker-compose
prusa_api - example json responses from the printer for easier writing code whithout the need of having working printer.

Configuration

Below example assumes you use Prusa Mini with given firmware version.

go to the Prusa LCD display menu
Setting - Network - PrusaLink, write down Current API Key (PRUSA_API_KEY)
ensure device got IP address (PRUSA_MINI_HOST_ADDRESS), write it down, will be needed later
ensure that your 3D printer has static IP address in the network
in the configs in this repo:
- printer address is PRUSA_MINI_HOST_ADDRESS or 192.168.1.25
- printer API key is PRUSA_API_KEY or hgyJKWXmhvEaPnK

if needed replace PRUSA_MINI_HOST_ADDRESS in with your printer address, so if your printer address is 192.168.0.20 then:

...
targets:
- name: prusa-mini-version
  url: http://PRUSA_MINI_HOST_ADDRESS:/api/version

becomes

...
targets:
- name: prusa-mini-version
  url: http://192.168.0.20:/api/version

as above replace PRUSA_API_KEY with your printer key, such as if your api key is DeaDBeeF
```
      headers:
        X-Api-Key: PRUSA_API_KEY
```
becomes
```
      headers:
        X-Api-Key: DeaDBeeF
```
and so on, I hope you get the idea :D

Test code

turn on the 3D printer
ensure configs are updated (printer IP and API key)
run docker-compose up and go to Prometheus at 127.0.0.1:9009, and see if Status > Targets are green, otherwise there is a problem between prometheus and json-exporter or json-exporter and printer.
go to Grafana at 127.0.0.1:3000 and use user: admin and password admin to log in, check existing dashboard if it shows anything.
copy dashboard, save as new, edit and save, export and add to directory path under grafana/dashboards/ but then you may need to change dashboard it in json file (usually at the very end of the file) to avoid duplicates
Grafana should reload dashboards automatically every 10 seconds

Known issues

Grafana DS_PROMETHEUS not found

In dashboard in templating list, add example section as in here

You committed secrets to the repo

I know.