[WIP on-hold] Reimplement metric store in pure java

[andsel]

Applied on top of #17858

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• [ ] My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files (and/or docker env variables)
• [ ] I have added tests that prove my fix is effective or that my feature works

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[github-actions[bot]]

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[mergify[bot]]

This pull request does not have a backport label. Could you fix it @andsel? 🙏 To fixup this pull request, you need to add the backport labels for the needed branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• If no backport is necessary, please add the backport-skip label

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