I just installed Uptime Kuma on my Umbrel from their app store and after installation, my network firewall has detected many external connection attempts to my network from all over the world from IP addresses that are on block lists for "bad reputation". Because of this, I removed the Uptime Kuma app and I am still getting these connection attempts. Seems like once you install Uptime Kuma, your IP address gets sent to a database or sold and now you're the target of some potentially malicious connections. Be warned.