Document configuration flags, environment variables and operational concerns

[Starefossen]

Component(s)

No response

Describe the issue you're reporting

Documentation of config flags and environment variables are currently missing. Also, some notes and conciderations for running the operator in production could also be useful such as what metrics are exposed. I would be happy to work on this if this is of interest.

[pavolloffay]

Thanks for opening the issue. I support having this in the docs.