I'm a huge fan of gotify. I use it to receive notifications when my backup system does its job, activity from my bittorrent client, alerts from fail2ban, and I'm sure a bunch of other things I'm forgetting about. Since it uses simple webhooks, so long as you can execute curl you can use it to push notifications out. So handy!
If I see persistent attacks from an IP I'll step in and blacklist the host proactively by setting up an evergreen iptables rule. It's incredibly rare but it happens once in a blue moon.
