refactor: separate metrics code for reuse #13514
Merged
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This PR is intended as a pure refactor to move code.
It separates the reusable metrics code into something that could be reused in a separate module.
This intention is proved in a separate PR which adds metrics to the server. #13515 should be used as a reference for how this would work.
The
version
metric is moved to also be reusable as it is simple and obvious to be reused in the server.Labels are renamed to Attributes as per OpenTelemetry.