Whatsupdocker is great for these. You can configure it from docker compose labels and set regex for version matching which is very usefull, you can also use mqtt and ntfy to have notifications in homeassistant and on your computers or phone.

You wanted to find out from those who ALSO run hosting servers in actual data centers what is their hosting panel in reddits selfhosted community?

With your higher intellect you should agree with me that you are an IDIOT ;)