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NB: I'm not sure that this is the correct project to file this issue in, but it's a start. Feel free to close with direction on which Spring project to file this issue in.
IMHO, Spring Data has one of the most mature release processes in the industry, especially with the notion of release trains. This can probably be said of many Spring projects now.
I'm wondering if the Spring team would consider productizing the release train machinery and make it available as an open source project. I feel like many companies/dev teams could benefit from the rigor & best practices that your release train process employs.