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- An API to expose internals read-only internal metrics was already suggested. Might be joined with the custom metrics. By the methods like "findRegistry" we can return also read-only internal metrics.
- Extending the initial API with more complex metrics like Histogram or HitRate.
- Introduce a permission for custom metric management.
- Storing registered custom metrics.
- Allowing to change settings of configurable custom metrics like histograms.
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