To use Fail2ban with Overseerr, create a new file named
overseerr.local in your Fail2ban
filter.d directory with the following filter definition:
[Definition]failregex = .*\[info\]\[Auth\]\: Failed sign-in attempt.*"ip":"<HOST>"
You can then add a jail using this filter in
jail.local. Please see the Fail2ban documetation for details on how to configure the jail.