docs(pubsub): Create a Cloud Pub/Sub sample for publishing with hedging (#14623)

This also bumps the samples libraries-bom version

Author: michaelpri10

java-pubsub/samples/snippets/pom.xml

@@ -45,7 +45,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>libraries-bom</artifactId>
-        <version>26.76.0</version>
+        <version>26.90.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>

java-pubsub/samples/snippets/src/main/java/pubsub/PublishWithHedgingSettingsExample.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package pubsub;
+
+// [START pubsub_publish_hedging_settings]
+
+import com.google.api.core.ApiFuture;
+import com.google.cloud.pubsub.v1.HedgingSettings;
+import com.google.cloud.pubsub.v1.Publisher;
+import com.google.protobuf.ByteString;
+import com.google.pubsub.v1.PubsubMessage;
+import com.google.pubsub.v1.TopicName;
+import java.io.IOException;
+import java.time.Duration;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+public class PublishWithHedgingSettingsExample {
+  public static void main(String... args) throws Exception {
+    // TODO(developer): Replace these variables before running the sample.
+    String projectId = "your-project-id";
+    String topicId = "your-topic-id";
+
+    publishWithHedgingSettingsExample(projectId, topicId);
+  }
+
+  public static void publishWithHedgingSettingsExample(String projectId, String topicId)
+      throws IOException, ExecutionException, InterruptedException {
+    TopicName topicName = TopicName.of(projectId, topicId);
+    Publisher publisher = null;
+
+    try {
+      // Hedging settings configures how and when the publisher sends multiple concurrent publish
+      // requests to reduce tail latency.
+      Duration hedgeDelay = Duration.ofMillis(500); // default: 1000 ms (1 second)
+      int maxTokens = 100; // default: 50
+      float refillRatio = 0.05f; // default: 0.1
+
+      HedgingSettings hedgingSettings =
+          HedgingSettings.newBuilder()
+              .setHedgeDelay(hedgeDelay)
+              .setMaxTokens(maxTokens)
+              .setRefillRatio(refillRatio)
+              .build();
+
+      // Create a publisher instance with hedging settings bound to the topic
+      publisher = Publisher.newBuilder(topicName).setHedgingSettings(hedgingSettings).build();
+
+      String message = "Hello world!";
+      ByteString data = ByteString.copyFromUtf8(message);
+      PubsubMessage pubsubMessage = PubsubMessage.newBuilder().setData(data).build();
+
+      // Once published, returns a server-assigned message id (unique within the topic)
+      ApiFuture<String> messageIdFuture = publisher.publish(pubsubMessage);
+      String messageId = messageIdFuture.get();
+      System.out.println("Published a message with hedging settings: " + messageId);
+
+    } finally {
+      if (publisher != null) {
+        // When finished with the publisher, shutdown to free up resources.
+        publisher.shutdown();
+        publisher.awaitTermination(1, TimeUnit.MINUTES);
+      }
+    }
+  }
+}
+// [END pubsub_publish_hedging_settings]

java-pubsub/samples/snippets/src/test/java/pubsub/PublisherIT.java

@@ -129,5 +129,10 @@ public void testPublisher() throws Exception {
     // Test publish with gRPC compression.
     PublishWithGrpcCompressionExample.publishWithGrpcCompressionExample(projectId, topicId);
     assertThat(bout.toString()).contains("Published a compressed message of message ID: ");
+
+    bout.reset();
+    // Test publish with hedging settings.
+    PublishWithHedgingSettingsExample.publishWithHedgingSettingsExample(projectId, topicId);
+    assertThat(bout.toString()).contains("Published a message with hedging settings: ");
   }
 }