We deployed an update of our software today (3 EC2 instances) and made a migration to our RDS (db.t2.medium, Postgres) which added one column to a table with ~15 rows. Before migrating, we had a CPU usage of around "2". After the migration the CPU usage increased to "60". After a db reboot, it dropped, but went up again.
As a sidenote: After migration we tried to connect using a GUI and it hanged while SSL-verification. We restartet the GUI and it worked again.
Any advice on this? Here is a screenshot with current metrics. You can clearly see the increase in usage.
We currently use PostgreSQL 9.6.2!