diff --git a/android/guava/src/com/google/common/collect/Comparators.java b/android/guava/src/com/google/common/collect/Comparators.java
index cf01e60c307e..ffc2f4df7495 100644
--- a/android/guava/src/com/google/common/collect/Comparators.java
+++ b/android/guava/src/com/google/common/collect/Comparators.java
@@ -19,6 +19,7 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.collect.CollectPreconditions.checkNonnegative;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import java.util.Comparator;
 import java.util.Iterator;
@@ -127,10 +128,12 @@ private Comparators() {}
    * log n) time and O(n) space.
    *
    * @throws IllegalArgumentException if {@code k < 0}
+   * @since NEXT (available since 22.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object> Collector<T, ?, List<T>> least(
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object> Collector<T, ?, List<T>> least(
       int k, Comparator<? super T> comparator) {
     checkNonnegative(k, "k");
     checkNotNull(comparator);
@@ -160,10 +163,12 @@ private Comparators() {}
    * takes O(n log n) time and O(n) space.
    *
    * @throws IllegalArgumentException if {@code k < 0}
+   * @since NEXT (available since 22.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object> Collector<T, ?, List<T>> greatest(
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object> Collector<T, ?, List<T>> greatest(
       int k, Comparator<? super T> comparator) {
     return least(k, comparator.reversed());
   }
diff --git a/android/guava/src/com/google/common/collect/ImmutableBiMap.java b/android/guava/src/com/google/common/collect/ImmutableBiMap.java
index d18d5b6f1ff0..564fe2ee1e44 100644
--- a/android/guava/src/com/google/common/collect/ImmutableBiMap.java
+++ b/android/guava/src/com/google/common/collect/ImmutableBiMap.java
@@ -19,6 +19,7 @@
 import static com.google.common.collect.CollectPreconditions.checkEntryNotNull;
 import static com.google.common.collect.CollectPreconditions.checkNonnegative;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.J2ktIncompatible;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
@@ -56,12 +57,16 @@ public abstract class ImmutableBiMap<K, V> extends ImmutableMap<K, V> implements
    * Object#equals(Object)}), an {@code IllegalArgumentException} is thrown when the collection
    * operation is performed. (This differs from the {@code Collector} returned by {@link
    * Collectors#toMap(Function, Function)}, which throws an {@code IllegalStateException}.)
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V> Collector<T, ?, ImmutableBiMap<K, V>> toImmutableBiMap(
-      Function<? super T, ? extends K> keyFunction,
-      Function<? super T, ? extends V> valueFunction) {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
+      Collector<T, ?, ImmutableBiMap<K, V>> toImmutableBiMap(
+          Function<? super T, ? extends K> keyFunction,
+          Function<? super T, ? extends V> valueFunction) {
     return CollectCollectors.toImmutableBiMap(keyFunction, valueFunction);
   }
 
@@ -621,14 +626,17 @@ private void readObject(ObjectInputStream stream) throws InvalidObjectException
    *
    * @throws UnsupportedOperationException always
    * @deprecated Use {@link ImmutableBiMap#toImmutableBiMap}.
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @Deprecated
   @DoNotCall("Use toImmutableBiMap")
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V> Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
-      Function<? super T, ? extends K> keyFunction,
-      Function<? super T, ? extends V> valueFunction) {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
+      Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
+          Function<? super T, ? extends K> keyFunction,
+          Function<? super T, ? extends V> valueFunction) {
     throw new UnsupportedOperationException();
   }
 
@@ -639,15 +647,18 @@ private void readObject(ObjectInputStream stream) throws InvalidObjectException
    *
    * @throws UnsupportedOperationException always
    * @deprecated
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @Deprecated
   @DoNotCall("Use toImmutableBiMap")
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V> Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
-      Function<? super T, ? extends K> keyFunction,
-      Function<? super T, ? extends V> valueFunction,
-      BinaryOperator<V> mergeFunction) {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
+      Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
+          Function<? super T, ? extends K> keyFunction,
+          Function<? super T, ? extends V> valueFunction,
+          BinaryOperator<V> mergeFunction) {
     throw new UnsupportedOperationException();
   }
 
diff --git a/android/guava/src/com/google/common/collect/ImmutableList.java b/android/guava/src/com/google/common/collect/ImmutableList.java
index 30328bb6f33e..c3dc6620a584 100644
--- a/android/guava/src/com/google/common/collect/ImmutableList.java
+++ b/android/guava/src/com/google/common/collect/ImmutableList.java
@@ -25,6 +25,7 @@
 import static com.google.common.collect.ObjectArrays.checkElementsNotNull;
 import static com.google.common.collect.RegularImmutableList.EMPTY;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -66,10 +67,13 @@ public abstract class ImmutableList<E> extends ImmutableCollection<E>
   /**
    * Returns a {@code Collector} that accumulates the input elements into a new {@code
    * ImmutableList}, in encounter order.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <E> Collector<E, ?, ImmutableList<E>> toImmutableList() {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <E> Collector<E, ?, ImmutableList<E>> toImmutableList() {
     return CollectCollectors.toImmutableList();
   }
 
diff --git a/android/guava/src/com/google/common/collect/ImmutableListMultimap.java b/android/guava/src/com/google/common/collect/ImmutableListMultimap.java
index deab19d8a178..4d7043699f8b 100644
--- a/android/guava/src/com/google/common/collect/ImmutableListMultimap.java
+++ b/android/guava/src/com/google/common/collect/ImmutableListMultimap.java
@@ -18,6 +18,7 @@
 
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -78,10 +79,13 @@ public class ImmutableListMultimap<K, V> extends ImmutableMultimap<K, V>
    *         .putAll('c', "arrot", "herry")
    *         .build();
    * }</pre>
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
       Collector<T, ?, ImmutableListMultimap<K, V>> toImmutableListMultimap(
           Function<? super T, ? extends K> keyFunction,
           Function<? super T, ? extends V> valueFunction) {
@@ -116,10 +120,13 @@ public class ImmutableListMultimap<K, V> extends ImmutableMultimap<K, V>
    *         .build();
    * }
    * }</pre>
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
       Collector<T, ?, ImmutableListMultimap<K, V>> flatteningToImmutableListMultimap(
           Function<? super T, ? extends K> keyFunction,
           Function<? super T, ? extends Stream<? extends V>> valuesFunction) {
diff --git a/android/guava/src/com/google/common/collect/ImmutableMap.java b/android/guava/src/com/google/common/collect/ImmutableMap.java
index 7b91cafc25ab..c88705b37ba7 100644
--- a/android/guava/src/com/google/common/collect/ImmutableMap.java
+++ b/android/guava/src/com/google/common/collect/ImmutableMap.java
@@ -22,6 +22,7 @@
 import static com.google.common.collect.CollectPreconditions.checkNonnegative;
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -79,12 +80,16 @@ public abstract class ImmutableMap<K, V> implements Map<K, V>, Serializable {
    * IllegalArgumentException} is thrown when the collection operation is performed. (This differs
    * from the {@code Collector} returned by {@link Collectors#toMap(Function, Function)}, which
    * throws an {@code IllegalStateException}.)
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V> Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
-      Function<? super T, ? extends K> keyFunction,
-      Function<? super T, ? extends V> valueFunction) {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
+      Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
+          Function<? super T, ? extends K> keyFunction,
+          Function<? super T, ? extends V> valueFunction) {
     return CollectCollectors.toImmutableMap(keyFunction, valueFunction);
   }
 
@@ -98,13 +103,17 @@ public abstract class ImmutableMap<K, V> implements Map<K, V>, Serializable {
    * future occurrences of the key would reinsert it).
    *
    * <p>Entries will appear in the encounter order of the first occurrence of the key.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V> Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
-      Function<? super T, ? extends K> keyFunction,
-      Function<? super T, ? extends V> valueFunction,
-      BinaryOperator<V> mergeFunction) {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
+      Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
+          Function<? super T, ? extends K> keyFunction,
+          Function<? super T, ? extends V> valueFunction,
+          BinaryOperator<V> mergeFunction) {
     return CollectCollectors.toImmutableMap(keyFunction, valueFunction, mergeFunction);
   }
 
diff --git a/android/guava/src/com/google/common/collect/ImmutableMultiset.java b/android/guava/src/com/google/common/collect/ImmutableMultiset.java
index 4612e30c119f..7a1057cdfd9a 100644
--- a/android/guava/src/com/google/common/collect/ImmutableMultiset.java
+++ b/android/guava/src/com/google/common/collect/ImmutableMultiset.java
@@ -19,6 +19,7 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -64,10 +65,13 @@ public abstract class ImmutableMultiset<E> extends ImmutableMultisetGwtSerializa
    * Returns a {@code Collector} that accumulates the input elements into a new {@code
    * ImmutableMultiset}. Elements iterate in order by the <i>first</i> appearance of that element in
    * encounter order.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <E> Collector<E, ?, ImmutableMultiset<E>> toImmutableMultiset() {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <E> Collector<E, ?, ImmutableMultiset<E>> toImmutableMultiset() {
     return CollectCollectors.toImmutableMultiset(Function.identity(), e -> 1);
   }
 
@@ -79,11 +83,16 @@ public abstract class ImmutableMultiset<E> extends ImmutableMultisetGwtSerializa
    * <p>If the mapped elements contain duplicates (according to {@link Object#equals}), the first
    * occurrence in encounter order appears in the resulting multiset, with count equal to the sum of
    * the outputs of {@code countFunction.applyAsInt(t)} for each {@code t} mapped to that element.
+   *
+   * @since NEXT (available since 22.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, E> Collector<T, ?, ImmutableMultiset<E>> toImmutableMultiset(
-      Function<? super T, ? extends E> elementFunction, ToIntFunction<? super T> countFunction) {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, E>
+      Collector<T, ?, ImmutableMultiset<E>> toImmutableMultiset(
+          Function<? super T, ? extends E> elementFunction,
+          ToIntFunction<? super T> countFunction) {
     return CollectCollectors.toImmutableMultiset(elementFunction, countFunction);
   }
 
diff --git a/android/guava/src/com/google/common/collect/ImmutableRangeMap.java b/android/guava/src/com/google/common/collect/ImmutableRangeMap.java
index 7d52da8a50c3..bc2143d6c512 100644
--- a/android/guava/src/com/google/common/collect/ImmutableRangeMap.java
+++ b/android/guava/src/com/google/common/collect/ImmutableRangeMap.java
@@ -18,6 +18,7 @@
 import static com.google.common.base.Preconditions.checkElementIndex;
 import static com.google.common.base.Preconditions.checkNotNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
 import com.google.common.collect.SortedLists.KeyAbsentBehavior;
@@ -55,10 +56,13 @@ public class ImmutableRangeMap<K extends Comparable<?>, V> implements RangeMap<K
   /**
    * Returns a {@code Collector} that accumulates the input elements into a new {@code
    * ImmutableRangeMap}. As in {@link Builder}, overlapping ranges are not permitted.
+   *
+   * @since NEXT (available since 23.1 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K extends Comparable<? super K>, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K extends Comparable<? super K>, V>
       Collector<T, ?, ImmutableRangeMap<K, V>> toImmutableRangeMap(
           Function<? super T, Range<K>> keyFunction,
           Function<? super T, ? extends V> valueFunction) {
diff --git a/android/guava/src/com/google/common/collect/ImmutableRangeSet.java b/android/guava/src/com/google/common/collect/ImmutableRangeSet.java
index ac31fae5f68f..458cb59449c2 100644
--- a/android/guava/src/com/google/common/collect/ImmutableRangeSet.java
+++ b/android/guava/src/com/google/common/collect/ImmutableRangeSet.java
@@ -22,6 +22,7 @@
 import static com.google.common.collect.SortedLists.KeyPresentBehavior.ANY_PRESENT;
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
 import com.google.common.collect.SortedLists.KeyAbsentBehavior;
@@ -64,10 +65,13 @@ public final class ImmutableRangeSet<C extends Comparable> extends AbstractRange
    * Returns a {@code Collector} that accumulates the input elements into a new {@code
    * ImmutableRangeSet}. As in {@link Builder}, overlapping ranges are not permitted and adjacent
    * ranges will be merged.
+   *
+   * @since NEXT (available since 23.1 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <E extends Comparable<? super E>>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <E extends Comparable<? super E>>
       Collector<Range<E>, ?, ImmutableRangeSet<E>> toImmutableRangeSet() {
     return CollectCollectors.toImmutableRangeSet();
   }
diff --git a/android/guava/src/com/google/common/collect/ImmutableSet.java b/android/guava/src/com/google/common/collect/ImmutableSet.java
index 54dda3208fa4..41d66311fcff 100644
--- a/android/guava/src/com/google/common/collect/ImmutableSet.java
+++ b/android/guava/src/com/google/common/collect/ImmutableSet.java
@@ -22,6 +22,7 @@
 import static com.google.common.collect.ObjectArrays.checkElementNotNull;
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.J2ktIncompatible;
 import com.google.common.annotations.VisibleForTesting;
@@ -58,10 +59,13 @@ public abstract class ImmutableSet<E> extends ImmutableCollection<E> implements
    * ImmutableSet}. Elements appear in the resulting set in the encounter order of the stream; if
    * the stream contains duplicates (according to {@link Object#equals(Object)}), only the first
    * duplicate in encounter order will appear in the result.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <E> Collector<E, ?, ImmutableSet<E>> toImmutableSet() {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <E> Collector<E, ?, ImmutableSet<E>> toImmutableSet() {
     return CollectCollectors.toImmutableSet();
   }
 
diff --git a/android/guava/src/com/google/common/collect/ImmutableSetMultimap.java b/android/guava/src/com/google/common/collect/ImmutableSetMultimap.java
index 0c2ad522b240..57b2db7cdd72 100644
--- a/android/guava/src/com/google/common/collect/ImmutableSetMultimap.java
+++ b/android/guava/src/com/google/common/collect/ImmutableSetMultimap.java
@@ -19,6 +19,7 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -86,10 +87,13 @@ public class ImmutableSetMultimap<K, V> extends ImmutableMultimap<K, V>
    *         .putAll('c', "arrot", "herry")
    *         .build();
    * }</pre>
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
       Collector<T, ?, ImmutableSetMultimap<K, V>> toImmutableSetMultimap(
           Function<? super T, ? extends K> keyFunction,
           Function<? super T, ? extends V> valueFunction) {
@@ -133,10 +137,13 @@ public class ImmutableSetMultimap<K, V> extends ImmutableMultimap<K, V>
    *         .build();
    * }
    * }</pre>
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
       Collector<T, ?, ImmutableSetMultimap<K, V>> flatteningToImmutableSetMultimap(
           Function<? super T, ? extends K> keyFunction,
           Function<? super T, ? extends Stream<? extends V>> valuesFunction) {
diff --git a/android/guava/src/com/google/common/collect/ImmutableSortedMap.java b/android/guava/src/com/google/common/collect/ImmutableSortedMap.java
index e9384791c6db..c973eb959faf 100644
--- a/android/guava/src/com/google/common/collect/ImmutableSortedMap.java
+++ b/android/guava/src/com/google/common/collect/ImmutableSortedMap.java
@@ -22,6 +22,7 @@
 import static com.google.common.collect.Maps.keyOrNull;
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -73,10 +74,13 @@ public final class ImmutableSortedMap<K, V> extends ImmutableMap<K, V>
    * IllegalArgumentException} is thrown when the collection operation is performed. (This differs
    * from the {@code Collector} returned by {@link Collectors#toMap(Function, Function)}, which
    * throws an {@code IllegalStateException}.)
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
       Collector<T, ?, ImmutableSortedMap<K, V>> toImmutableSortedMap(
           Comparator<? super K> comparator,
           Function<? super T, ? extends K> keyFunction,
@@ -92,10 +96,13 @@ public final class ImmutableSortedMap<K, V> extends ImmutableMap<K, V>
    * <p>If the mapped keys contain duplicates (according to the comparator), the values are merged
    * using the specified merging function. Entries will appear in the encounter order of the first
    * occurrence of the key.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
       Collector<T, ?, ImmutableSortedMap<K, V>> toImmutableSortedMap(
           Comparator<? super K> comparator,
           Function<? super T, ? extends K> keyFunction,
@@ -1216,14 +1223,17 @@ private void readObject(ObjectInputStream stream) throws InvalidObjectException
    *
    * @throws UnsupportedOperationException always
    * @deprecated Use {@link ImmutableSortedMap#toImmutableSortedMap}.
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @DoNotCall("Use toImmutableSortedMap")
   @Deprecated
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V> Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
-      Function<? super T, ? extends K> keyFunction,
-      Function<? super T, ? extends V> valueFunction) {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
+      Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
+          Function<? super T, ? extends K> keyFunction,
+          Function<? super T, ? extends V> valueFunction) {
     throw new UnsupportedOperationException();
   }
 
@@ -1234,15 +1244,18 @@ private void readObject(ObjectInputStream stream) throws InvalidObjectException
    *
    * @throws UnsupportedOperationException always
    * @deprecated Use {@link ImmutableSortedMap#toImmutableSortedMap}.
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @DoNotCall("Use toImmutableSortedMap")
   @Deprecated
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K, V> Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
-      Function<? super T, ? extends K> keyFunction,
-      Function<? super T, ? extends V> valueFunction,
-      BinaryOperator<V> mergeFunction) {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K, V>
+      Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
+          Function<? super T, ? extends K> keyFunction,
+          Function<? super T, ? extends V> valueFunction,
+          BinaryOperator<V> mergeFunction) {
     throw new UnsupportedOperationException();
   }
 
diff --git a/android/guava/src/com/google/common/collect/ImmutableSortedMultiset.java b/android/guava/src/com/google/common/collect/ImmutableSortedMultiset.java
index 52362e461fa1..8f86e6e88b6a 100644
--- a/android/guava/src/com/google/common/collect/ImmutableSortedMultiset.java
+++ b/android/guava/src/com/google/common/collect/ImmutableSortedMultiset.java
@@ -17,6 +17,7 @@
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
 import com.google.common.annotations.VisibleForTesting;
@@ -67,10 +68,13 @@ public abstract class ImmutableSortedMultiset<E> extends ImmutableMultiset<E>
    *
    * <p><b>Warning:</b> {@code comparator} should be <i>consistent with {@code equals}</i> as
    * explained in the {@link Comparator} documentation.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <E> Collector<E, ?, ImmutableSortedMultiset<E>> toImmutableSortedMultiset(
+  @Beta // TODO: b/288085449 - Remove.
+  public static <E> Collector<E, ?, ImmutableSortedMultiset<E>> toImmutableSortedMultiset(
       Comparator<? super E> comparator) {
     return toImmutableSortedMultiset(comparator, Function.identity(), e -> 1);
   }
@@ -83,10 +87,13 @@ public abstract class ImmutableSortedMultiset<E> extends ImmutableMultiset<E>
    * <p>If the mapped elements contain duplicates (according to {@code comparator}), the first
    * occurrence in encounter order appears in the resulting multiset, with count equal to the sum of
    * the outputs of {@code countFunction.applyAsInt(t)} for each {@code t} mapped to that element.
+   *
+   * @since NEXT (available since 22.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, E>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, E>
       Collector<T, ?, ImmutableSortedMultiset<E>> toImmutableSortedMultiset(
           Comparator<? super E> comparator,
           Function<? super T, ? extends E> elementFunction,
@@ -753,12 +760,14 @@ private void readObject(ObjectInputStream stream) throws InvalidObjectException
    *
    * @throws UnsupportedOperationException always
    * @deprecated Use {@link ImmutableSortedMultiset#toImmutableSortedMultiset}.
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @DoNotCall("Use toImmutableSortedMultiset.")
   @Deprecated
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <E> Collector<E, ?, ImmutableMultiset<E>> toImmutableMultiset() {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <E> Collector<E, ?, ImmutableMultiset<E>> toImmutableMultiset() {
     throw new UnsupportedOperationException();
   }
 
@@ -769,13 +778,17 @@ private void readObject(ObjectInputStream stream) throws InvalidObjectException
    *
    * @throws UnsupportedOperationException always
    * @deprecated Use {@link ImmutableSortedMultiset#toImmutableSortedMultiset}.
+   * @since NEXT (available since 22.0 in guava-jre)
    */
   @DoNotCall("Use toImmutableSortedMultiset.")
   @Deprecated
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, E> Collector<T, ?, ImmutableMultiset<E>> toImmutableMultiset(
-      Function<? super T, ? extends E> elementFunction, ToIntFunction<? super T> countFunction) {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, E>
+      Collector<T, ?, ImmutableMultiset<E>> toImmutableMultiset(
+          Function<? super T, ? extends E> elementFunction,
+          ToIntFunction<? super T> countFunction) {
     throw new UnsupportedOperationException();
   }
 
diff --git a/android/guava/src/com/google/common/collect/ImmutableSortedSet.java b/android/guava/src/com/google/common/collect/ImmutableSortedSet.java
index b92d6cf93c83..f119301aa73e 100644
--- a/android/guava/src/com/google/common/collect/ImmutableSortedSet.java
+++ b/android/guava/src/com/google/common/collect/ImmutableSortedSet.java
@@ -20,6 +20,7 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.collect.ObjectArrays.checkElementsNotNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -69,10 +70,13 @@ public abstract class ImmutableSortedSet<E> extends ImmutableSet<E>
    *
    * <p>If the elements contain duplicates (according to the comparator), only the first duplicate
    * in encounter order will appear in the result.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <E> Collector<E, ?, ImmutableSortedSet<E>> toImmutableSortedSet(
+  @Beta // TODO: b/288085449 - Remove.
+  public static <E> Collector<E, ?, ImmutableSortedSet<E>> toImmutableSortedSet(
       Comparator<? super E> comparator) {
     return CollectCollectors.toImmutableSortedSet(comparator);
   }
@@ -793,12 +797,14 @@ Object writeReplace() {
    *
    * @throws UnsupportedOperationException always
    * @deprecated Use {@link ImmutableSortedSet#toImmutableSortedSet}.
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @DoNotCall("Use toImmutableSortedSet")
   @Deprecated
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <E> Collector<E, ?, ImmutableSet<E>> toImmutableSet() {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <E> Collector<E, ?, ImmutableSet<E>> toImmutableSet() {
     throw new UnsupportedOperationException();
   }
 
diff --git a/android/guava/src/com/google/common/collect/ImmutableTable.java b/android/guava/src/com/google/common/collect/ImmutableTable.java
index 91c9f71a633e..20fa98c5c832 100644
--- a/android/guava/src/com/google/common/collect/ImmutableTable.java
+++ b/android/guava/src/com/google/common/collect/ImmutableTable.java
@@ -18,6 +18,7 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -60,10 +61,13 @@ public abstract class ImmutableTable<R, C, V> extends AbstractTable<R, C, V>
    *
    * <p>The returned {@code Collector} will throw a {@code NullPointerException} at collection time
    * if the row, column, or value functions return null on any input.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, R, C, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, R, C, V>
       Collector<T, ?, ImmutableTable<R, C, V>> toImmutableTable(
           Function<? super T, ? extends R> rowFunction,
           Function<? super T, ? extends C> columnFunction,
@@ -79,10 +83,13 @@ public abstract class ImmutableTable<R, C, V> extends AbstractTable<R, C, V>
    *
    * <p>The returned {@code Collector} will throw a {@code NullPointerException} at collection time
    * if the row, column, value, or merging functions return null on any input.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, R, C, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, R, C, V>
       Collector<T, ?, ImmutableTable<R, C, V>> toImmutableTable(
           Function<? super T, ? extends R> rowFunction,
           Function<? super T, ? extends C> columnFunction,
diff --git a/android/guava/src/com/google/common/collect/Maps.java b/android/guava/src/com/google/common/collect/Maps.java
index 01f0ee2bf211..6171c476c7d0 100644
--- a/android/guava/src/com/google/common/collect/Maps.java
+++ b/android/guava/src/com/google/common/collect/Maps.java
@@ -25,6 +25,7 @@
 import static java.util.Collections.singletonMap;
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -189,10 +190,13 @@ public static <K extends Enum<K>, V> ImmutableMap<K, V> immutableEnumMap(
    * {@link java.util.stream.Collectors#toMap(java.util.function.Function,
    * java.util.function.Function) Collectors.toMap(Function, Function)}, which throws an {@code
    * IllegalStateException}.)
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K extends Enum<K>, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K extends Enum<K>, V>
       Collector<T, ?, ImmutableMap<K, V>> toImmutableEnumMap(
           java.util.function.Function<? super T, ? extends K> keyFunction,
           java.util.function.Function<? super T, ? extends V> valueFunction) {
@@ -207,10 +211,13 @@ public static <K extends Enum<K>, V> ImmutableMap<K, V> immutableEnumMap(
    *
    * <p>If the mapped keys contain duplicates, the values are merged using the specified merging
    * function.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, K extends Enum<K>, V>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, K extends Enum<K>, V>
       Collector<T, ?, ImmutableMap<K, V>> toImmutableEnumMap(
           java.util.function.Function<? super T, ? extends K> keyFunction,
           java.util.function.Function<? super T, ? extends V> valueFunction,
diff --git a/android/guava/src/com/google/common/collect/MoreCollectors.java b/android/guava/src/com/google/common/collect/MoreCollectors.java
index 02b254d2d54c..8d5a41495c35 100644
--- a/android/guava/src/com/google/common/collect/MoreCollectors.java
+++ b/android/guava/src/com/google/common/collect/MoreCollectors.java
@@ -19,6 +19,7 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 import static java.util.Collections.emptyList;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import java.util.ArrayList;
 import java.util.List;
@@ -33,12 +34,14 @@
  * with a {@code com.google.common} type.
  *
  * @author Louis Wasserman
+ * @since NEXT (available since 21.0 in guava-jre)
  */
 @GwtCompatible
 @ElementTypesAreNonnullByDefault
 @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
 @IgnoreJRERequirement // Users will use this only if they're already using streams.
-final class MoreCollectors {
+@Beta // TODO: b/288085449 - Remove.
+public final class MoreCollectors {
 
   /*
    * TODO(lowasser): figure out if we can convert this to a concurrent AtomicReference-based
diff --git a/android/guava/src/com/google/common/collect/Multimaps.java b/android/guava/src/com/google/common/collect/Multimaps.java
index 3b113ff82ebb..51a380cfb5fe 100644
--- a/android/guava/src/com/google/common/collect/Multimaps.java
+++ b/android/guava/src/com/google/common/collect/Multimaps.java
@@ -22,6 +22,7 @@
 import static com.google.common.collect.NullnessCasts.uncheckedCastNullableTToT;
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -107,10 +108,13 @@ private Multimaps() {}
    * <p>To collect to an {@link ImmutableMultimap}, use either {@link
    * ImmutableSetMultimap#toImmutableSetMultimap} or {@link
    * ImmutableListMultimap#toImmutableListMultimap}.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <
+  @Beta // TODO: b/288085449 - Remove.
+  public static <
           T extends @Nullable Object,
           K extends @Nullable Object,
           V extends @Nullable Object,
@@ -152,10 +156,13 @@ private Multimaps() {}
    *     FIRST_LETTER_MULTIMAP.putAll('c', Arrays.asList('h', 'e', 'r', 'r', 'y'));
    * }
    * }</pre>
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <
+  @Beta // TODO: b/288085449 - Remove.
+  public static <
           T extends @Nullable Object,
           K extends @Nullable Object,
           V extends @Nullable Object,
diff --git a/android/guava/src/com/google/common/collect/Multisets.java b/android/guava/src/com/google/common/collect/Multisets.java
index b477391be61f..19f98628be38 100644
--- a/android/guava/src/com/google/common/collect/Multisets.java
+++ b/android/guava/src/com/google/common/collect/Multisets.java
@@ -22,6 +22,7 @@
 import static com.google.common.collect.CollectPreconditions.checkRemove;
 import static java.util.Objects.requireNonNull;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.base.Objects;
 import com.google.common.base.Predicate;
@@ -77,10 +78,13 @@ private Multisets() {}
    *
    * <p>To collect to an {@link ImmutableMultiset}, use {@link
    * ImmutableMultiset#toImmutableMultiset}.
+   *
+   * @since NEXT (available since 22.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <T extends @Nullable Object, E extends @Nullable Object, M extends Multiset<E>>
+  @Beta // TODO: b/288085449 - Remove.
+  public static <T extends @Nullable Object, E extends @Nullable Object, M extends Multiset<E>>
       Collector<T, ?, M> toMultiset(
           Function<? super T, E> elementFunction,
           ToIntFunction<? super T> countFunction,
diff --git a/android/guava/src/com/google/common/collect/Sets.java b/android/guava/src/com/google/common/collect/Sets.java
index 5fd70fdceae6..22b65199370f 100644
--- a/android/guava/src/com/google/common/collect/Sets.java
+++ b/android/guava/src/com/google/common/collect/Sets.java
@@ -20,6 +20,7 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.collect.CollectPreconditions.checkNonnegative;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
@@ -144,10 +145,13 @@ public static <E extends Enum<E>> ImmutableSet<E> immutableEnumSet(Iterable<E> e
    * Returns a {@code Collector} that accumulates the input elements into a new {@code ImmutableSet}
    * with an implementation specialized for enums. Unlike {@link ImmutableSet#toImmutableSet}, the
    * resulting set will iterate over elements in their enum definition order, not encounter order.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <E extends Enum<E>> Collector<E, ?, ImmutableSet<E>> toImmutableEnumSet() {
+  @Beta // TODO: b/288085449 - Remove.
+  public static <E extends Enum<E>> Collector<E, ?, ImmutableSet<E>> toImmutableEnumSet() {
     return CollectCollectors.toImmutableEnumSet();
   }
 
diff --git a/android/guava/src/com/google/common/collect/Tables.java b/android/guava/src/com/google/common/collect/Tables.java
index ba276d510abb..bd2137cfcb36 100644
--- a/android/guava/src/com/google/common/collect/Tables.java
+++ b/android/guava/src/com/google/common/collect/Tables.java
@@ -20,6 +20,7 @@
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.collect.NullnessCasts.uncheckedCastNullableTToT;
 
+import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 import com.google.common.base.Function;
 import com.google.common.base.Objects;
@@ -62,10 +63,13 @@ private Tables() {}
    * is thrown when the collection operation is performed.
    *
    * <p>To collect to an {@link ImmutableTable}, use {@link ImmutableTable#toImmutableTable}.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <
+  @Beta // TODO: b/288085449 - Remove.
+  public static <
           T extends @Nullable Object,
           R extends @Nullable Object,
           C extends @Nullable Object,
@@ -91,10 +95,13 @@ private Tables() {}
    * BinaryOperator, java.util.function.Supplier)}, this Collector throws a {@code
    * NullPointerException} on null values returned from {@code valueFunction}, and treats nulls
    * returned from {@code mergeFunction} as removals of that row/column pair.
+   *
+   * @since NEXT (available since 21.0 in guava-jre)
    */
   @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
   @IgnoreJRERequirement // Users will use this only if they're already using streams.
-  static <
+  @Beta // TODO: b/288085449 - Remove.
+  public static <
           T extends @Nullable Object,
           R extends @Nullable Object,
           C extends @Nullable Object,