One of the realities of having public facing SSH is the continual brute force attempts. I have 3 droplets at DigitalOcean, SGP1 and NYC2 get hit much more often than LON1. I thought about deploying SSH ACLs through SaltStack, but because all my systems are keys only, instead I deployed fail2ban with a custom configuration file to watch the bots get banned and laugh maniacally.
The relevant parts of config were as follows:
This deploys a custom jail.local file, which is the recommended way for deploying fail2ban.
This makes it quite easy to change ban times globally, or based on other grains.