* Most Multimap implementations use a List or Set (or even Multiset) for their values, in which
     * case Multimap equality works as expected. Users who use a Collection type that does not
     * implement equals(), such as most Queue implementations, will get the same behavior from our
     * value-collection wrappers (and from Multimap.equals) as from the underlying Collection.
     */
    @SuppressWarnings("UndefinedEquals")

- Sometimes, the scheduler incorrectly placed a pod in the "unschedulable" queue instead of the "backoff" queue. This happened when some plugin previously declared the pod as "unschedulable" and then in a later attempt encounters some other error. Scheduling of that pod then got delayed by up to five minutes, after which periodic flushing moved the pod back into the "active" queue. ([#120334](https://github.com/kubernetes/kubernetes/pull/120334), [@pohly](https://github.com/pohly))...

- Fixes the bug in PodTopologySpread that only happens with QHint enabled, 

    }

    @Override
    public @Nullable ReferenceEntry<K, V> getEntry() {
      return null;
    }

    @Override
    public ValueReference<K, V> copyFor(
        ReferenceQueue<V> queue, V value, ReferenceEntry<K, V> entry) {
      return this;
    }

    public void setLoading(boolean loading) {
      this.loading = loading;
    }

    @Override

- Refactor scheduler's framework permit API. ([#83756](https://github.com/kubernetes/kubernetes/pull/83756), [@hex108](https://github.com/hex108))
- Add incoming pods metrics to scheduler queue. ([#83577](https://github.com/kubernetes/kubernetes/pull/83577), [@liu-cong](https://github.com/liu-cong))

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