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• Custom metrics affect performance and take additional resources.
• There could be race conditions on metric registrations. Metrics with incompatible types can be concurrently registered with the same names.
• We do not expose API of all internal metrics. At least with the first tickets.
• Custom metrics aren't stored and require re-registration after node restart. At least with the first tickets.

API

APIs description

To give an user the ability to register additional metrics, we could either:

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