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These two approaches are shown below.

The APIs are supposed to be experimental.

Obtaining Custom Metrics

package org.apache.ignite;

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package org.apache.ignite.metric;
@IgniteExperimental

public interface IgniteMetrics extends Iterable<ReadOnlyMetricRegistry> {

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package org.apache.ignite.metric;

@IgniteExperimental
public interface IgniteMetricRegistry extends ReadOnlyMetricRegistry {
    IntMetric register(String name, IntSupplier supplier, @Nullable String desc);
    LongMetric register(String name, LongSupplier supplier, @Nullable String desc);
    DoubleMetric register(String name, DoubleSupplier supplier, @Nullable String desc);
    <T> ObjectMetric<T> register(String name, Supplier<T> supplier, Class<T> type, @Nullable String desc);
    BooleanMetric register(String name, BooleanSupplier supplier, @Nullable String desc);

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package org.apache.ignite.metric;
@IgniteExperimental

public interface ObjectValueMetric<T> extends ObjectMetric<T> {
    void value(T value);
}
@IgniteExperimental

public interface DoubleValueMetric extends DoubleMetric {
    void add(double value);
    void value(double value);
}

@IgniteExperimental
public interface LongSumMetric extends LongMetric {
    void add(long value);
    void increment();
    void decrement();
}

@IgniteExperimental
public interface LongValueMetric extends LongSumMetric {
    void value(long value);
}

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package org.apache.ignite;@IgniteExperimental

public interface IgniteMetrics extends Iterable<ReadOnlyMetricRegistry> {

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