I don't think there are people attempting to log into HA, because it has zero value to them. HA would log failed login attempts but not bots trying other stuff. When I look into my web statistics for my rented server for march with 404 errors, I got over 750 and they try to access wordpress, find old (and probably not updated) stuff and some config files, like .env files. This kinda makes sense and probably would find everybody in their access logs. Its just automated stuff and they probably run auto exploits. Wordpress sites are interesting and its worth just getting access to a kinda serious email sender or just other stuff. My ssh blocklist currently has 14000 banned IPs. Might not sure how I set it up, but it looks I picked 1 year ban time.

If you know where to look, you would see bots trying to enter your system but you would see they aim big, not small. HA is small. Sure if HA has a serious hole, you would get attacks from pranksters. Still is always a good idea to have proper security procedures for all of your accounts and servers. Most interesting are targets where they could find value within these services or using the hardware but there are always people who just want to mess with someone. There are for example people who search the internet for Minecraft servers, that they can grieve the shit out of it. Doesn't matter if its a big professional server or just a server from 2 kiddos, that play together after school.