Download image from releases page or alternatively you can choose CI pipeline run and download particular artifact. Downloaded img.xz file is named prusa_exporter_{version}.img.xz and needs to be flashed to the memory card.
Download and install Raspberry Pi Imager. You can alternatively use different tool but rpi-imager is easiest in terms of settings.
After installing open the Raspberry Pi Imager. Don't click Choose Device instead of that click on Choose OS. Scroll down, you'll find Use Custom. Select downloaded image.
Now connect memory card to your computer and click Choose Storage. BEWARE - you can mistakenly choose wrong storage media and flashing process includes formating your drive. Now select your Raspberry Pi memory card. Now click Next.
Now it depends if you want to connect via LAN or WiFi.
If you want to use wireless ethernet, then click at Edit Settings. Click at Configure wireless LAN and write your WiFi name (SSID) and password. Don't forget to select correct Wireless LAN country. Next be sure that Eject media when finished is unchecked . Click Save and after that click on Yes. If you are sure that all content of your memory card would be erased, click Yes.
If you want to use wired ethernet, then click at Edit Settings, click Options and be sure that Eject media when finished is unchecked . Click Save and after that click on Yes. If you are sure that all content of your memory card would be erased, click Yes.
Now wait for the Raspberry Pi Imager to complete the flash process.
Now we need to configure Grafana Agent and prusa_exporter. After flashing you should see new partition connected to system, can be called boot or bootfs. In Windows you'll get also letter of partition, nowadays most probably D: - can varies. If you don't see new partition. Eject memory card from the system and reconnect it.
In boot partition you'll find two files agent.yaml and prusa.yml. Configuration is mentioned in next part of README.
How to configure prusa.yml you can find in exporter.md and in config.md you'll find how to configure Grafana Agent.