Lack of documentation.

[hedgss]

Hi,

I see that postgres-operator, Spilo documentation doesn't cover some important topics:

• Matrix compatibility. I know, it is always a lack of resources. But in any case, you test your releases and it'd be good to share more information.
  • Postgres-operator and kubernetes version. What versions were tested and compatible?
  • Postgres-operator and spilo images. What versions can be used together?
• Upgrade guide. No information about the upgrade process, what issues can happen. How to fix them, etc. Common errors, issues and pitfalls.
  No suggestions on how to handle breaking changes.
• No information about what exactly required by postgres-operator to be able to manage patroni inside Spilo.
  What information is stored in etcd. How postgres-operator sends requests to patroni, how patroni authorize it.
• Share more information about your best practices that can include a lot of topics, such as
  • backups & restore
  • monitoring
  • replication configuration
  • etc

I think the list of questions is much longer, but these are the questions that I faced.
I think it'd be useful for the rest as well.