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You might want to add in networking components as well. Throw in (OS) packaging as well (not all services are put into containers...). I'd change 'automation' to 'config management', since the former concept is also part of a number of other nodes (particularly CI and orchestration). Datastores and their efficient use are another set of nodes (databases, caches/cdns, things like s3). Secrets management (fun!) is another one, though that belongs under config management.

I have a question. How are automation and CI different?

I don't know much about these stuff and the only thing I have ever touched is Jenkins. So how is Jenkins actually different from Ansible for example?

Nice. Hope you don't mind me pointing this out, but cluster manager seems like odd semantics, wouldn't that grouping be container orchestration?

Yes, I think that is more appropriate too. Will change it now.

Very useful, thanks for sharing