Hello,
Thank you for your follow up!
Based on our records, we detected SSH brute forcing attacks originating from IP 104.197.64.121 targeting more than 13,153,426 IP addresses on 7/8/2016.
As the project owner, you are responsible for securing the software installed on your machine. Please provide us with more information regarding the behavior of your project and specifically how it could relate to what we have detected.
Sincerely,
Google Cloud Platform / API Abuse Team