I have various integrations and they all act differently when a known device is not being detected. In most cases the logfile gets so many warning or error messages I filter them out. I am not asking for solutions here, but what SHOULD happen.
For example, I have Reolink cameras using the standard integration. I cut the power to them at night and then the logfile gets flooded with lines of code that have failed. My Denon AVR using Denon integration works fine when I turn the AVR off (to standby or completely off), but if HA is rebooted when it is already off the integration reports it as network error and constantly tries to connect.
HACS integrations Tapo and Local Tuya flood the logfile with failed code, but Meross reports a single line per device every 4 hours … to me that is a good compromise.
So what is the designers’ plan for handling devices that are currently not detected? Is there a document I can read about that subject?