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It is useful for user to work with own metrics, not only with provided by Ignite. Current The current public metrics API doesn't expose any method to add or delete additional metrics.

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1. 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 also return also read-only internal metrics.
2. Extending the initial API with metrics like Histogram or HitRate.
3. Introduce a permission for custom metric management.
4. Storing registered custom metrics.
5. Allowing to change settings of configurable custom metrics like histograms.

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