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public interface IgniteMetrics extends Iterable<ReadOnlyMetricRegistry> {

    IgniteMetricRegistry MetricRegistry customRegistry(String registryName);

    @Nullable ReadOnlyMetricRegistry findRegistry(String registryName);

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package org.apache.ignite.metric;

public interface IgniteMetricRegistry MetricRegistry 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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