BruteForce Attack

How often you have BF Attacks?

If no damage, do you inform about it people reponsible for attacker's network (ISP, hosting service, admin etc...)?

Is it somwhere any kind of general register/forum etc to report stuff like that?

I have this today:

The remote system 64.33.158.235 was found to have exceeded acceptable login failures on xxx.yyy.com... ; there was 149 events to the service sshd. As such the attacking host has been banned from further accessing this system. For the integrity of your host you should investigate this event as soon as possible.

Executed ban command:
/etc/apf/apf -d 64.33.158.235 {bfd.sshd}

The following are event logs from 64.33.158.235 on service sshd (all time stamps are GMT +0100):

Dec 28 05:36:57 vps sshd[26802]: Failed password for illegal user qmails from 64.33.158.235 port 42779 ssh2
....
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