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I have found that doing blue - green cluster deploys is a better experience, doing in cluster upgrades is super dangerous, unfortunately it looks like they got some tech debt and cant use that method - we use a similar method as this post without the ci ( would love to do that though but small steps 😂 ) - https://www.reddit.com/r/RedditEng/comments/11xx5o0/comment/jd77lf5/?utm_source=share&utm_medium=web3x

Blue green and argocd. Using Terraform. We do not trust in place upgrades and even so there are cluster wide components that have the same blast radius