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• Custom Metrics are based on the New Metric System.
• A custom Custom metric name always begins with the prefix "custom.".

• GridMetricManager handles the custom metrics.

• We should provide an API with ready-to-use simple metrics like LongMetric, DoubleMetric and a generic Metric.
• Custom metrics management requires a permission.
• We should document examples of effecient metrics implementations like LongAdder.

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package org.apache.ignite;

public interface IgniteMetrics {

   <T extends Metric> T metric(T metric);

   void longMetric(String name, LongSupplier valueSupplier, @Nullable String description);

   LongConsumer longMetric(String name, @Nullable String description);

   void doubleMetric(String name, DoubleSupplier valueSupplier, @Nullable String description);

   DoubleConsumer doubleMetric(String name, @Nullable String description);

   void booleanMetric(String name, BooleanSupplier valueSupplier, @Nullable String description);

   Consumer<Boolean> booleanMetric(String name, @Nullable String description);

   <T> void objectMetric(String name, Class<T> valueType, Supplier<T> valueSupplier, @Nullable String description);

   <T> Consumer<T> objectMetric(String name, Class<T> valueType, @Nullable String description);

   void removeMetric(String name);

   ReadOnlyMetricRegistry registry(String name);
}

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