I just discovered Uptime Kuma and installed it, apart from HA in a docker container and added the integration in HA.
As a test I added a device (ping monitor) which works fine, the sensors in HA show the correct info.
If I take that device offline, the state changes in HA, so that's OK too.
Bringing that device back online is showing in Uptime Kuma but it doesn't change it HA and there, the sensors remain in the unavailable state, even after over 1 hour.
I'm I missing something?