- Kube-apiserver: bugfix DeleteCollection API fails if request body is non-empty ([#113967](https://github.com/kubernetes/kubernetes/pull/113967), [@sxllwx](https://github.com/sxllwx)) [SIG API Machinery]

  abstract ImmutableCollection<E> delegateCollection();

  @Override
  public boolean contains(@CheckForNull Object target) {
    // The collection's contains() is at least as fast as ImmutableList's
    // and is often faster.
    return delegateCollection().contains(target);
  }

  @Override
  public int size() {
    return delegateCollection().size();
  }

  @Override

  abstract ImmutableCollection<E> delegateCollection();

  @Override
  public boolean contains(@CheckForNull Object target) {
    // The collection's contains() is at least as fast as ImmutableList's
    // and is often faster.
    return delegateCollection().contains(target);
  }

  @Override
  public int size() {
    return delegateCollection().size();
  }

  @Override

    super(backingSet, backingList);
  }

  @Override
  ImmutableSortedSet<E> delegateCollection() {
    return (ImmutableSortedSet<E>) super.delegateCollection();
  }

  @Override
  public Comparator<? super E> comparator() {
    return delegateCollection().comparator();
  }

  // Override indexOf() and lastIndexOf() to be O(log N) instead of O(N).

- Kube-apiserver: DELETECOLLECTION API requests are now recorded in metrics with the correct verb. ([#113133](https://github.com/kubernetes/kubernetes/pull/113133), [@sxllwx](https://github.com/sxllwx)) [SIG API Machinery]

- Fixed the regression that introduced 34s timeout for DELETECOLLECTION calls ([#115341](https://github.com/kubernetes/kubernetes/pull/115341), [@tkashem](https://github.com/tkashem))
- Fixed two regressions introduced by the `PodDisruptionConditions` feature (on by default in 1.26):

  }

  RegularImmutableAsList(ImmutableCollection<E> delegate, Object[] array) {
    this(delegate, ImmutableList.<E>asImmutableList(array));
  }

  @Override
  ImmutableCollection<E> delegateCollection() {
    return delegate;
  }

  ImmutableList<? extends E> delegateList() {
    return delegateList;
  }

  @SuppressWarnings("unchecked") // safe covariant cast!
  @Override

- Fix the regression that introduced 34s timeout for DELETECOLLECTION calls ([#115479](https://github.com/kubernetes/kubernetes/pull/115479), [@tkashem](https://github.com/tkashem)) [SIG API Machinery]

      }

      @Override
      public int size() {
        return IndexedImmutableSet.this.size();
      }

      @Override
      ImmutableCollection<E> delegateCollection() {
        return IndexedImmutableSet.this;
      }

      // redeclare to help optimizers with b/310253115
      @SuppressWarnings("RedundantOverride")
      @Override
      @J2ktIncompatible // serialization

  }

  RegularImmutableAsList(ImmutableCollection<E> delegate, Object[] array, int size) {
    this(delegate, ImmutableList.<E>asImmutableList(array, size));
  }

  @Override
  ImmutableCollection<E> delegateCollection() {
    return delegate;
  }

  ImmutableList<? extends E> delegateList() {
    return delegateList;
  }

  @SuppressWarnings("unchecked") // safe covariant cast!
  @Override