diff --git a/benchmarks/README.md b/benchmarks/README.md
index 4f829e22a03..ed7fa875822 100644
--- a/benchmarks/README.md
+++ b/benchmarks/README.md
@@ -50,4 +50,7 @@ mvn clean compile exec:java -Dexec.args="--clients=10 --operations=5000 --multip
 make sure that tests uses regular sessions.
 ```shell
 mvn clean compile exec:java -Dexec.args="--clients=10 --operations=5000"
-```
\ No newline at end of file
+```
+```shell
+mvn clean compile exec:java -Dcheckstyle.skip -Dexec.args="--clients=1 --operations=10000  --transaction=READ_ONLY_MULTI_USE --multiplexed=false --grpcgcpextension=false"
+```
diff --git a/benchmarks/pom.xml b/benchmarks/pom.xml
index 14131d2342d..67608552976 100644
--- a/benchmarks/pom.xml
+++ b/benchmarks/pom.xml
@@ -49,12 +49,12 @@
     <dependency>
       <groupId>com.google.cloud.opentelemetry</groupId>
       <artifactId>exporter-trace</artifactId>
-      <version>0.29.0</version>
+      <version>0.31.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.cloud.opentelemetry</groupId>
       <artifactId>exporter-metrics</artifactId>
-      <version>0.29.0</version>
+      <version>0.31.0</version>
     </dependency>
     <!-- OpenTelemetry test dependencies -->
     <dependency>
@@ -92,7 +92,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner</artifactId>
-      <version>6.67.0</version>
+      <version>6.71.1-SNAPSHOT</version>
     </dependency>
     <dependency>
       <groupId>commons-cli</groupId>
diff --git a/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/BenchmarkRunner.java b/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/BenchmarkRunner.java
index 7a731887a86..d91e6b122c6 100644
--- a/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/BenchmarkRunner.java
+++ b/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/BenchmarkRunner.java
@@ -31,5 +31,6 @@ List<Duration> execute(
       int numClients,
       int numOperations,
       int waitMillis,
-      boolean useMultiplexedSession);
+      boolean useMultiplexedSession,
+      boolean enableGrpcGcpExtension);
 }
diff --git a/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/JavaClientRunner.java b/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/JavaClientRunner.java
index 6fc0842f376..686ac6820ae 100644
--- a/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/JavaClientRunner.java
+++ b/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/JavaClientRunner.java
@@ -66,7 +66,8 @@ public List<Duration> execute(
       int numClients,
       int numOperations,
       int waitMillis,
-      boolean useMultiplexedSession) {
+      boolean useMultiplexedSession,
+      boolean enableGrpcGcpExtension) {
     // setup open telemetry metrics and traces
     // setup open telemetry metrics and traces
     SpanExporter traceExporter = TraceExporter.createWithDefaultConfiguration();
@@ -97,13 +98,18 @@ public List<Duration> execute(
             .build();
     SpannerOptions.enableOpenTelemetryMetrics();
     SpannerOptions.enableOpenTelemetryTraces();
-    SpannerOptions options =
+    SpannerOptions.Builder optionsBuilder =
         SpannerOptions.newBuilder()
             .setOpenTelemetry(openTelemetry)
             .setProjectId(databaseId.getInstanceId().getProject())
             .setSessionPoolOption(sessionPoolOptions)
-            .setHost(SERVER_URL)
-            .build();
+            .setHost(SERVER_URL);
+    if (enableGrpcGcpExtension) {
+      System.out.println("Using gRPC-GCP extension for channel management");
+      optionsBuilder.enableGrpcGcpExtension();
+    }
+
+    SpannerOptions options = optionsBuilder.build();
     // Register query stats metric.
     // This should be done once before start recording the data.
     Meter meter = openTelemetry.getMeter("cloud.google.com/java");
diff --git a/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/LatencyBenchmark.java b/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/LatencyBenchmark.java
index 73683932def..3407543abdc 100644
--- a/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/LatencyBenchmark.java
+++ b/benchmarks/src/main/java/com/google/cloud/spanner/benchmark/LatencyBenchmark.java
@@ -79,6 +79,8 @@ private static CommandLine parseCommandLine(String[] args) throws ParseException
     options.addOption("m", "multiplexed", true, "Use multiplexed sessions. Defaults to false.");
     options.addOption("w", "wait", true, "Wait time in millis. Defaults to zero.");
     options.addOption("name", true, "Name of this test run");
+    options.addOption(
+        "g", "grpcgcpextension", true, "enable gRPC-GCP extension. Defaults to false.");
     CommandLineParser parser = new DefaultParser();
     return parser.parse(options, args);
   }
@@ -102,6 +104,8 @@ public void run(CommandLine commandLine) {
             : TransactionType.READ_ONLY_SINGLE_USE;
     boolean useMultiplexedSession =
         commandLine.hasOption('m') ? Boolean.parseBoolean(commandLine.getOptionValue('m')) : false;
+    boolean enableGrpcGcpExtension =
+        commandLine.hasOption('g') ? Boolean.parseBoolean(commandLine.getOptionValue('g')) : false;
 
     System.out.println();
     System.out.println("Running benchmark with the following options");
@@ -111,6 +115,7 @@ public void run(CommandLine commandLine) {
     System.out.printf("Transaction type: %s\n", transactionType);
     System.out.printf("Use Multiplexed Sessions: %s\n", useMultiplexedSession);
     System.out.printf("Wait between queries: %dms\n", waitMillis);
+    System.out.printf("Using gRPC-GCP extension: %s\n", enableGrpcGcpExtension);
 
     List<Duration> javaClientResults = null;
     System.out.println();
@@ -118,7 +123,12 @@ public void run(CommandLine commandLine) {
     JavaClientRunner javaClientRunner = new JavaClientRunner(databaseId);
     javaClientResults =
         javaClientRunner.execute(
-            transactionType, clients, operations, waitMillis, useMultiplexedSession);
+            transactionType,
+            clients,
+            operations,
+            waitMillis,
+            useMultiplexedSession,
+            enableGrpcGcpExtension);
 
     printResults("Java Client Library", javaClientResults);
   }
diff --git a/google-cloud-spanner-executor/pom.xml b/google-cloud-spanner-executor/pom.xml
index 6df4fe5830c..dab4b02fcde 100644
--- a/google-cloud-spanner-executor/pom.xml
+++ b/google-cloud-spanner-executor/pom.xml
@@ -30,6 +30,11 @@
       <groupId>io.grpc</groupId>
       <artifactId>grpc-api</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.google.cloud</groupId>
+      <artifactId>grpc-gcp</artifactId>
+      <version>1.6.1</version>
+    </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-netty-shaded</artifactId>
diff --git a/google-cloud-spanner/pom.xml b/google-cloud-spanner/pom.xml
index 8a79e70362e..4c2abb0feee 100644
--- a/google-cloud-spanner/pom.xml
+++ b/google-cloud-spanner/pom.xml
@@ -162,6 +162,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>grpc-gcp</artifactId>
+      <version>1.6.1</version>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
@@ -266,7 +267,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-monitoring</artifactId>
-      <version>3.38.0</version>
+      <version>3.31.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java
index b6016f04f78..3226214e69a 100644
--- a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java
+++ b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java
@@ -56,6 +56,7 @@
 import com.google.api.pathtemplate.PathTemplate;
 import com.google.cloud.RetryHelper;
 import com.google.cloud.RetryHelper.RetryHelperException;
+import com.google.cloud.grpc.GcpManagedChannel;
 import com.google.cloud.grpc.GcpManagedChannelBuilder;
 import com.google.cloud.grpc.GcpManagedChannelOptions;
 import com.google.cloud.grpc.GcpManagedChannelOptions.GcpMetricsOptions;
@@ -1950,7 +1951,16 @@ <ReqT, RespT> GrpcCallContext newCallContext(
       boolean routeToLeader) {
     GrpcCallContext context = GrpcCallContext.createDefault();
     if (options != null) {
+      // Set channel affinity in GAX
       context = context.withChannelAffinity(Option.CHANNEL_HINT.getLong(options).intValue());
+      // Set channel affinity in gRPC-GCP
+      context =
+          context.withCallOptions(
+              context
+                  .getCallOptions()
+                  .withOption(
+                      GcpManagedChannel.AFFINITY_KEY,
+                      Option.CHANNEL_HINT.getLong(options).toString()));
     }
     if (compressorName != null) {
       // This sets the compressor for Client -> Server.
diff --git a/samples/snippets/grpc_java_logging_config.txt b/samples/snippets/grpc_java_logging_config.txt
new file mode 100644
index 00000000000..8199d87d7e9
--- /dev/null
+++ b/samples/snippets/grpc_java_logging_config.txt
@@ -0,0 +1,3 @@
+handlers = java.util.logging.ConsoleHandler
+java.util.logging.ConsoleHandler.level = ALL
+com.google.cloud.grpc.GcpManagedChannel.level=FINEST
diff --git a/samples/snippets/pom.xml b/samples/snippets/pom.xml
index ced7df0a375..a5bdf9fab5a 100644
--- a/samples/snippets/pom.xml
+++ b/samples/snippets/pom.xml
@@ -42,9 +42,15 @@
   </dependencyManagement>
 
   <dependencies>
+    <dependency>
+      <groupId>com.google.cloud</groupId>
+      <artifactId>grpc-gcp</artifactId>
+      <version>1.6.1</version>
+    </dependency>
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner</artifactId>
+      <version>6.69.1-SNAPSHOT</version>
     </dependency>
     <!-- [END spanner_install_with_bom] -->
 
diff --git a/samples/snippets/src/main/java/com/example/spanner/Mux.java b/samples/snippets/src/main/java/com/example/spanner/Mux.java
new file mode 100644
index 00000000000..2039add3afd
--- /dev/null
+++ b/samples/snippets/src/main/java/com/example/spanner/Mux.java
@@ -0,0 +1,45 @@
+package com.example.spanner;
+
+import com.google.cloud.spanner.DatabaseClient;
+import com.google.cloud.spanner.DatabaseId;
+import com.google.cloud.spanner.ResultSet;
+import com.google.cloud.spanner.Spanner;
+import com.google.cloud.spanner.SpannerOptions;
+import com.google.cloud.spanner.Statement;
+import java.math.BigDecimal;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+class Mux {
+  public static void main(String[] args){
+    Logger.getLogger("com.google.cloud.grpc.GcpManagedChannel").setLevel(Level.FINEST);
+    queryWithNumericParameter();
+  }
+
+  static void queryWithNumericParameter() {
+    // TODO(developer): Replace these variables before running the sample.
+    String projectId = "span-cloud-testing";
+    String instanceId = "harsha-test-gcloud";
+    String databaseId = "database1";
+
+    try (Spanner spanner =
+        SpannerOptions.newBuilder().setProjectId(projectId).enableGrpcGcpExtension().build().getService()) {
+      DatabaseClient client =
+          spanner.getDatabaseClient(DatabaseId.of(projectId, instanceId, databaseId));
+      queryWithNumericParameter(client);
+    }
+  }
+
+  static void queryWithNumericParameter(DatabaseClient client) {
+    Statement statement =
+        Statement.newBuilder(
+                "SELECT SingerId, FirstName, LastName FROM Singers")
+            .build();
+    try (ResultSet resultSet = client.singleUse().executeQuery(statement)) {
+      while (resultSet.next()) {
+        System.out.printf(
+            "%d %s %s %n", resultSet.getLong("SingerId"), resultSet.getString("FirstName"), resultSet.getString("LastName"));
+      }
+    }
+  }
+}