Expose cache performance metrics for Prometheus

[andrew-demb]

Is your feature request related to a problem? Please describe.

S3 Cloud providers often have built pricing in correlation with used traffic

Describe the solution you'd like

We want to propose to consider a proposal about supporting exposing Prometheus metrics about cache performance

Example metrics to be supported: cache miss count, cache hit count, cache miss bytes count, cache hit bytes count

Describe alternatives you've considered

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Additional context

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