Ruby on Rails: 0 downtime deployment (Docker)

let's straight to the point, What value does this article provide?

How I evolve my Rails 5 app to easy 0 downtime deployment.
What I tried, What works, What didn't

it's useful to who?

Rails developer

Link here

https://github.com/puma/puma/issues/1600#issuecomment-467701844
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