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1. Custom Metrics based on the New Metric System.
2. Allow to register essential ready-to-use metrics like LongMetric which can be exported by a providing metric exporter.
3. User can add own metrics into different registries.
4. Custom metrics are separated from the internals by registry name prefix "custom." (lower cased). 
5. Names of custom metrics and their registries can't contain any spaces.
6. Management of custom metrics might require a permission.

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