I have a root server from Hetzner and got the disclosure mail, which was very detailed.
Customer data was compromised, including the hashed/salted passwords and the last 3 digits of credit card numbers (which should not really be an issue).
This is not the first major breach at Hetzner, in 2011 managed server account passwords were compromised as well.
Back then they advised customers to reset the passwords for all accounts for the admin panel.
The interesting question... is Hetzner sloppy about security, more so than it's competitors, or are they actually more vigilant and/or more forthcoming about breaches?
I have the uncomfortable hunch that we do not hear about a lot of breaches at all the cloud sevices/hosters out there.