To your other issue with Cloud SQL, there is sadly a mandatory downtime with every release they do (often weekly). The team is working on it and knows it's unacceptable for serving workloads.
Edit: Here's a link to the maintenance note in the FAQ for reference - https://cloud.google.com/sql/faq#maintenancerestart
Outage today was on us-central1-a. I got alerts from multiple agents - new relic, zabbix and ssh monitor so I don't think it can be blamed on tools or something like this. It happened in two bursts, this is the first one http://imgur.com/XdzuJ2r with messages from both zabbix and new relic, the time zone in the emails is EEST. These are all different machines, no duplication.
I speak with experience with Google, AWS and Rackspace.