track cache sizes [skip ci]

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

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[hanabi1224]

It seems to be expensive to always update the metrics, I'd register a prometheus_client::collector::Collector instead

[LesnyRumcajs]

Yeah, I know - no need to review this branch while in draft. It's just a dump of the code I had for analysing the memory usage.

[LesnyRumcajs]

closing in favour of #5920