CVE-2019-5736 Runc and Docker vulnerability remediation
Scheduled for Apr 23, 09:00 - 15:00 UTC
SRE needs to apply pending security updates, especially runc and docker:

This will Apply update security updates and reboot hosts.
Posted 5 days ago. Apr 17, 2019 - 15:02 UTC
This scheduled maintenance affects: pro-us-east-1 (Master API Service, Application Creation Service, Docker Registry Service, etcd Service).