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To the package "org.apache.ignite.metric" we add:

• BooleanValueMetric
• IntValueMetric
• LongValueMetric
• LongSumMetric (a long adder)
• DoubleValueMetric
• AnyValueMetric<T> (an object metric)(an object metric)

Names like "LongMetric" or "ObjectMetric" we already have in the package "org.apache.ignite.spi.metric".

3.3 Examples of new  writeable metric intefraces

package org.apache.ignite.metric;

/** Updatable object value metric. */
@IgniteExperimental
public interface AnyValueMetric<T> extends ObjectMetric<T> {
    /** Sets object metric value./
    void value(T value);
} 

/** Updatable simple double value metric. */
@IgniteExperimental
public interface DoubleValueMetric extends DoubleMetric {
    /** Raises metric value. */
    void add(double value);

    /** Sets double metric value. */
    void value(double value);
}

/** Updatable long metric which is efficient with adding values. Calculates sum in {@link LongMetric#value()}. */
@IgniteExperimental
public interface LongSumMetric extends LongMetric {
    /** Raises metric value. */
    void add(long value);

    /** Increments metric value with 1L. */
    void increment();

    /** Decrements metric value with -1L. */
    void decrement();
}

/** Updatable simple long value metric. */
@IgniteExperimental
public interface LongValueMetric extends LongSumMetric {
    /** Sets long metric value. */
    void value(long value);
}

4. Minimal Custom Metric interface

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