It appears Home Assistant’s official PrusaLink integration is not yet compatible with the PrusaLink API shipped with a MK4 printer. This project was put together as a temp solution to fix my existing automations requiring various metrics from the Printer’s API.
You can follow the HA issue here:
https://github.com/home-assistant/core/issues/95529
My most important automation is turning on my exhaust if the temp starts to rise on the bed or nozzle.