* thread was holding a lock, the listener may deadlock or break lock isolation.
   *
   * <p>This instance is equivalent to:
   *
   * {@snippet :
   * final class DirectExecutor implements Executor {
   *   public void execute(Runnable r) {
   *     r.run();
   *   }
   * }
   * }
   *

   *   <li>All of the parameters present in the argument are present in this instance.
   * </ol>
   *
   * <p>For example:
   *
   * {@snippet :
   * PLAIN_TEXT_UTF_8.is(PLAIN_TEXT_UTF_8) // true
   * PLAIN_TEXT_UTF_8.is(HTML_UTF_8) // false
   * PLAIN_TEXT_UTF_8.is(ANY_TYPE) // true
   * PLAIN_TEXT_UTF_8.is(ANY_TEXT_TYPE) // true

  }

  /**
   * A builder for creating immutable sorted set instances, especially {@code public static final}
   * sets ("constant sets"), with a given comparator. Example:
   *
   * {@snippet :
   * public static final ImmutableSortedSet<Number> LUCKY_NUMBERS =
   *     new ImmutableSortedSet.Builder<Number>(ODDS_FIRST_COMPARATOR)
   *         .addAll(SINGLE_DIGIT_PRIMES)
   *         .add(42)

  }

  /**
   * A builder for creating immutable map instances, especially {@code public static final} maps
   * ("constant maps"). Example:
   *
   * {@snippet :
   * static final ImmutableMap<String, Integer> WORD_TO_INT =
   *     new ImmutableMap.Builder<String, Integer>()
   *         .put("one", 1)
   *         .put("two", 2)
   *         .put("three", 3)

  }

  /**
   * A builder for creating immutable map instances, especially {@code public static final} maps
   * ("constant maps"). Example:
   *
   * {@snippet :
   * static final ImmutableMap<String, Integer> WORD_TO_INT =
   *     new ImmutableMap.Builder<String, Integer>()
   *         .put("one", 1)
   *         .put("two", 2)
   *         .put("three", 3)

  }

  /**
   * A builder for creating immutable sorted map instances, especially {@code public static final}
   * maps ("constant maps"). Example:
   *
   * {@snippet :
   * static final ImmutableSortedMap<Integer, String> INT_TO_WORD =
   *     new ImmutableSortedMap.Builder<Integer, String>(Ordering.natural())
   *         .put(1, "one")
   *         .put(2, "two")

  }

  /**
   * A builder for creating immutable sorted map instances, especially {@code public static final}
   * maps ("constant maps"). Example:
   *
   * {@snippet :
   * static final ImmutableSortedMap<Integer, String> INT_TO_WORD =
   *     new ImmutableSortedMap.Builder<Integer, String>(Ordering.natural())
   *         .put(1, "one")
   *         .put(2, "two")

   * iteration, and hence return the same object each time. A subsequent call to {@code next} is
   * guaranteed to return the same object again. For example:
   *
   * {@snippet :
   * PeekingIterator<String> peekingIterator =
   *     Iterators.peekingIterator(Iterators.forArray("a", "b"));
   * String a1 = peekingIterator.peek(); // returns "a"

   * iteration, and hence return the same object each time. A subsequent call to {@code next} is
   * guaranteed to return the same object again. For example:
   *
   * {@snippet :
   * PeekingIterator<String> peekingIterator =
   *     Iterators.peekingIterator(Iterators.forArray("a", "b"));
   * String a1 = peekingIterator.peek(); // returns "a"

* update the signing key for percona debian and ubuntu packages ([#41186](https://github.com/kubernetes/kubernetes/pull/41186), [@dixudx](https://github.com/dixudx))
* fc: Drop multipath.conf snippet ([#36698](https://github.com/kubernetes/kubernetes/pull/36698), [@fabiand](https://github.com/fabiand))

Please see the [Releases Page](https://github.com/kubernetes/kubernetes/releases) for older releases.