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

   /** Removes custom metric named '"custom." + {@code name}'. */
   void removeMetric(String name);

   /** @return custom Metric registry named '"custom." + {@code name}'. */
   ReadOnlyMetricRegistry registry(String name);

   
   // Simple type metrics.

   /** Registers LongMetric. */
   LongConsumer longMetric(String name, @Nullable String description);
   /** Registers DoubleMetric. */

   DoubleConsumer doubleMetric(String name, @Nullable String description);
   /** Registers BooleanMetric. */

   Consumer<Boolean> booleanMetric(String name, @Nullable String description);
   /** Registers ObjectMetric. */

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


   // Might be useful the gauges:
   /** Registers DoubleGauge. */

   void doubleMetric(String name, DoubleSupplier valueSupplier, @Nullable String description);
   /** Registers BooleanGauge. */

   void booleanMetric(String name, BooleanSupplier valueSupplier, @Nullable String description);
   /** Registers ObjectGauge. */

   <T> void objectMetric(String name, Class<T> valueType, Supplier<T> valueSupplier, @Nullable String description);
   /** Registers LongGauge. */

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

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