};
  }

  /**
   * Combines two iterators into a single iterator. The returned iterator iterates across the
   * elements in {@code a}, followed by the elements in {@code b}. The source iterators are not
   * polled until necessary.
   *
   * <p>The returned iterator supports {@code remove()} when the corresponding input iterator
   * supports it.
   */
  public static <T extends @Nullable Object> Iterator<T> concat(

    };
  }

  /**
   * Combines two iterators into a single iterator. The returned iterator iterates across the
   * elements in {@code a}, followed by the elements in {@code b}. The source iterators are not
   * polled until necessary.
   *
   * <p>The returned iterator supports {@code remove()} when the corresponding input iterator
   * supports it.
   */
  public static <T extends @Nullable Object> Iterator<T> concat(

e:before{content:"\f529"}.fa-dizzy:before{content:"\f567"}.fa-dna:before{content:"\f471"}.fa-dochub:before{content:"\f394"}.fa-docker:before{content:"\f395"}.fa-dog:before{content:"\f6d3"}.fa-dollar-sign:before{content:"\f155"}.fa-dolly:before{content:"\f472"}.fa-dolly-flatbed:before{content:"\f474"}.fa-donate:before{content:"\f4b9"}.fa-door-closed:before{content:"\f52a"}.fa-door-open:before{content:"\f52b"}.fa-dot-circle:before{content:"\f192"}.fa-dove:before{content:"\f4ba"}.fa-download:before...

e:before{content:"\f529"}.fa-dizzy:before{content:"\f567"}.fa-dna:before{content:"\f471"}.fa-dochub:before{content:"\f394"}.fa-docker:before{content:"\f395"}.fa-dog:before{content:"\f6d3"}.fa-dollar-sign:before{content:"\f155"}.fa-dolly:before{content:"\f472"}.fa-dolly-flatbed:before{content:"\f474"}.fa-donate:before{content:"\f4b9"}.fa-door-closed:before{content:"\f52a"}.fa-door-open:before{content:"\f52b"}.fa-dot-circle:before{content:"\f192"}.fa-dove:before{content:"\f4ba"}.fa-download:before...

              "expr": "sum(rate(galley_validation_passed[1m]))",
              "interval": "",
              "legendFormat": "Validations (Success)",
              "refId": "A"
            },
            {
              "datasource": {
                "type": "prometheus",
                "uid": "${datasource}"
              },
              "expr": "sum(rate(galley_validation_failed[1m]))",

     */
    WeakValueReference<K, V, E> copyFor(ReferenceQueue<V> queue, E entry);
  }

  /**
   * A dummy implementation of {@link InternalEntry}, solely for use in the type signature of {@link
   * #UNSET_WEAK_VALUE_REFERENCE} below.
   */
  static final class DummyInternalEntry
      implements InternalEntry<Object, Object, DummyInternalEntry> {