Failed user logins logs on Linux

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1

Installed my self hosted bitwarden a few months ago and trying to do some hardening on the server side access.
I wanted to configure fail2ban to block password brute force attacks and similar.
Could someone share the location of failed login logs or if they are available at all?

Thank you.

2

use this command with sudo privileges

lastlog

It retrieves /var/log/lastlog values