I forgot to mention 3 very important things "to add":

- security (you should already know a great deal from your work as a developer, the general things such as no open ports, no plain text passwords, etc.)

- related to security: secret management (Chef, Puppet - I think, Vault)

- backups, backups, backups: for the database and basically anything which is not reproducible from source (which in general should only be your database data)