@@ -49,7 +49,7 @@ If you are using Maven without BOM, add this to your dependencies:
 If you are using Gradle 5.x or later, add this to your dependencies
 
 ```Groovy
-implementation platform('com.google.cloud:libraries-bom:25.4.0')
+implementation platform('com.google.cloud:libraries-bom:26.0.0')
 
 implementation 'com.google.cloud:google-cloud-bigtable'
 ```
 
@@ -50,7 +50,7 @@
         <dependency>
             <groupId>io.opencensus</groupId>
             <artifactId>opencensus-impl</artifactId>
-            <scope>test</scope>
+            <scope>runtime</scope>
         </dependency>
         <dependency>
             <groupId>com.google.truth</groupId>
 
@@ -25,6 +25,7 @@
 /** For registering built-in metric views */
 @InternalApi("For internal use only")
 public class BuiltinViews {
+
   @VisibleForTesting
   static final ImmutableSet<View> BIGTABLE_BUILTIN_VIEWS =
       ImmutableSet.of(
@@ -44,7 +45,7 @@ void registerPrivateViews(ViewManager viewManager) {
     }
   }
 
-  public void registerBigtableBuiltinViews() {
+  public static void registerBigtableBuiltinViews() {
     ViewManager viewManager = Stats.getViewManager();
     for (View view : BIGTABLE_BUILTIN_VIEWS) {
       viewManager.registerView(view);
 
@@ -20,7 +20,10 @@
 import com.google.api.core.InternalApi;
 import com.google.api.gax.tracing.SpanName;
 import io.opencensus.stats.Stats;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 /**
  * Wrapper class for accessing opencensus. We use a shaded version of opencensus to avoid polluting
@@ -34,4 +37,16 @@ public static StatsRecorderWrapper createRecorder(
     return new StatsRecorderWrapper(
         operationType, spanName, statsAttributes, Stats.getStatsRecorder());
   }
+
+  // This is used in integration tests to get the tag value strings from view manager because Stats
+  // is relocated to com.google.bigtable.veneer.repackaged.io.opencensus.
+  @InternalApi("Visible for testing")
+  public static List<String> getOperationLatencyViewTagValueStrings() {
+    return Stats.getViewManager().getView(BuiltinViewConstants.OPERATION_LATENCIES_VIEW.getName())
+        .getAggregationMap().entrySet().stream()
+        .map(Map.Entry::getKey)
+        .flatMap(x -> x.stream())
+        .map(x -> x.asString())
+        .collect(Collectors.toCollection(ArrayList::new));
+  }
 }
@@ -21,25 +21,26 @@
 import com.google.api.gax.rpc.ResponseObserver;
 import com.google.api.gax.rpc.ServerStreamingCallable;
 import com.google.api.gax.rpc.StreamController;
+import com.google.bigtable.v2.ResponseParams;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Stopwatch;
+import com.google.protobuf.InvalidProtocolBufferException;
 import io.grpc.Metadata;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Nonnull;
 
 /**
  * This callable will
- *
- * <p>-inject a {@link GrpcResponseMetadata} to access the headers and trailers returned by gRPC
- * methods upon completion. The {@link BigtableTracer} will process metrics that were injected in
- * the header/trailer and publish them to OpenCensus. If {@link GrpcResponseMetadata#getMetadata()}
- * returned null, it probably means that the request has never reached GFE, and it'll increment the
- * gfe_header_missing_counter in this case.
- *
- * <p>-Call {@link BigtableTracer#onRequest()} to record the request events in a stream.
- *
- * <p>This class is considered an internal implementation detail and not meant to be used by
- * applications.
+ * <li>-Inject a {@link GrpcResponseMetadata} to access the headers returned by gRPC methods upon
+ *     completion. The {@link BigtableTracer} will process metrics that were injected in the
+ *     header/trailer and publish them to OpenCensus. If {@link GrpcResponseMetadata#getMetadata()}
+ *     returned null, it probably means that the request has never reached GFE, and it'll increment
+ *     the gfe_header_missing_counter in this case.
+ * <li>-This class will also access trailers from {@link GrpcResponseMetadata} to record zone and
+ *     cluster ids.
+ * <li>-Call {@link BigtableTracer#onRequest(int)} to record the request events in a stream.
+ * <li>This class is considered an internal implementation detail and not meant to be used by
+ *     applications.
  */
 @InternalApi
 public class BigtableTracerStreamingCallable<RequestT, ResponseT>
@@ -102,6 +103,14 @@ public void onError(Throwable t) {
       Metadata metadata = responseMetadata.getMetadata();
       Long latency = Util.getGfeLatency(metadata);
       tracer.recordGfeMetadata(latency, t);
+      try {
+        byte[] trailers =
+            metadata.get(Metadata.Key.of(Util.RESPONSE_PRAMS_KEY, Metadata.BINARY_BYTE_MARSHALLER));
+        ResponseParams decodedTrailers = ResponseParams.parseFrom(trailers);
+        tracer.setLocations(decodedTrailers.getZoneId(), decodedTrailers.getClusterId());
+      } catch (NullPointerException | InvalidProtocolBufferException e) {
+      }
+
       outerObserver.onError(t);
     }
 
@@ -110,6 +119,14 @@ public void onComplete() {
       Metadata metadata = responseMetadata.getMetadata();
       Long latency = Util.getGfeLatency(metadata);
       tracer.recordGfeMetadata(latency, null);
+      try {
+        byte[] trailers =
+            metadata.get(Metadata.Key.of(Util.RESPONSE_PRAMS_KEY, Metadata.BINARY_BYTE_MARSHALLER));
+        ResponseParams decodedTrailers = ResponseParams.parseFrom(trailers);
+        tracer.setLocations(decodedTrailers.getZoneId(), decodedTrailers.getClusterId());
+      } catch (NullPointerException | InvalidProtocolBufferException e) {
+      }
+
       outerObserver.onComplete();
     }
   }
 
@@ -22,20 +22,24 @@
 import com.google.api.gax.grpc.GrpcResponseMetadata;
 import com.google.api.gax.rpc.ApiCallContext;
 import com.google.api.gax.rpc.UnaryCallable;
+import com.google.bigtable.v2.ResponseParams;
 import com.google.common.base.Preconditions;
 import com.google.common.util.concurrent.MoreExecutors;
+import com.google.protobuf.InvalidProtocolBufferException;
 import io.grpc.Metadata;
 import javax.annotation.Nonnull;
 
 /**
- * This callable will inject a {@link GrpcResponseMetadata} to access the headers and trailers
- * returned by gRPC methods upon completion. The {@link BigtableTracer} will process metrics that
- * were injected in the header/trailer and publish them to OpenCensus. If {@link
- * GrpcResponseMetadata#getMetadata()} returned null, it probably means that the request has never
- * reached GFE, and it'll increment the gfe_header_missing_counter in this case.
- *
- * <p>This class is considered an internal implementation detail and not meant to be used by
- * applications.
+ * This callable will:
+ * <li>- Inject a {@link GrpcResponseMetadata} to access the headers returned by gRPC methods upon
+ *     completion. The {@link BigtableTracer} will process metrics that were injected in the
+ *     header/trailer and publish them to OpenCensus. If {@link GrpcResponseMetadata#getMetadata()}
+ *     returned null, it probably means that the request has never reached GFE, and it'll increment
+ *     the gfe_header_missing_counter in this case.
+ * <li>-This class will also access trailers from {@link GrpcResponseMetadata} to record zone and
+ *     cluster ids.
+ * <li>This class is considered an internal implementation detail and not meant to be used by
+ *     applications.
  */
 @InternalApi
 public class BigtableTracerUnaryCallable<RequestT, ResponseT>
@@ -78,13 +82,27 @@ public void onFailure(Throwable throwable) {
       Metadata metadata = responseMetadata.getMetadata();
       Long latency = Util.getGfeLatency(metadata);
       tracer.recordGfeMetadata(latency, throwable);
+      try {
+        byte[] trailers =
+            metadata.get(Metadata.Key.of(Util.RESPONSE_PRAMS_KEY, Metadata.BINARY_BYTE_MARSHALLER));
+        ResponseParams decodedTrailers = ResponseParams.parseFrom(trailers);
+        tracer.setLocations(decodedTrailers.getZoneId(), decodedTrailers.getClusterId());
+      } catch (NullPointerException | InvalidProtocolBufferException e) {
+      }
     }
 
     @Override
     public void onSuccess(ResponseT response) {
       Metadata metadata = responseMetadata.getMetadata();
       Long latency = Util.getGfeLatency(metadata);
       tracer.recordGfeMetadata(latency, null);
+      try {
+        byte[] trailers =
+            metadata.get(Metadata.Key.of(Util.RESPONSE_PRAMS_KEY, Metadata.BINARY_BYTE_MARSHALLER));
+        ResponseParams decodedTrailers = ResponseParams.parseFrom(trailers);
+        tracer.setLocations(decodedTrailers.getZoneId(), decodedTrailers.getClusterId());
+      } catch (NullPointerException | InvalidProtocolBufferException e) {
+      }
     }
   }
 }
@@ -58,7 +58,7 @@ public class Util {
       Metadata.Key.of("server-timing", Metadata.ASCII_STRING_MARSHALLER);
   private static final Pattern SERVER_TIMING_HEADER_PATTERN = Pattern.compile(".*dur=(?<dur>\\d+)");
 
-  static final String TRAILER_KEY = "x-goog-ext-425905942-bin";
+  static final String RESPONSE_PRAMS_KEY = "x-goog-ext-425905942-bin";
 
   /** Convert an exception into a value that can be used to create an OpenCensus tag value. */
   static String extractStatus(@Nullable Throwable error) {
 
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2022 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
+ *
+ *     https://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 com.google.cloud.bigtable.data.v2.it;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.TruthJUnit.assume;
+
+import com.google.api.core.ApiFuture;
+import com.google.api.gax.rpc.NotFoundException;
+import com.google.cloud.bigtable.admin.v2.models.Cluster;
+import com.google.cloud.bigtable.data.v2.models.Query;
+import com.google.cloud.bigtable.data.v2.models.Row;
+import com.google.cloud.bigtable.stats.BuiltinViews;
+import com.google.cloud.bigtable.stats.StatsWrapper;
+import com.google.cloud.bigtable.test_helpers.env.EmulatorEnv;
+import com.google.cloud.bigtable.test_helpers.env.TestEnvRule;
+import com.google.common.collect.Lists;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+import org.junit.BeforeClass;
+import org.junit.ClassRule;
+import org.junit.Test;
+
+public class StreamingMetricsMetadataIT {
+  @ClassRule public static TestEnvRule testEnvRule = new TestEnvRule();
+
+  @BeforeClass
+  public static void setUpClass() {
+    assume()
+        .withMessage("StreamingMetricsMetadataIT is not supported on Emulator")
+        .that(testEnvRule.env())
+        .isNotInstanceOf(EmulatorEnv.class);
+    BuiltinViews.registerBigtableBuiltinViews();
+  }
+
+  @Test
+  public void testSuccess() throws Exception {
+    String prefix = UUID.randomUUID().toString();
+    String uniqueKey = prefix + "-read";
+
+    Query query = Query.create(testEnvRule.env().getTableId()).rowKey(uniqueKey);
+    ArrayList<Row> rows = Lists.newArrayList(testEnvRule.env().getDataClient().readRows(query));
+
+    ApiFuture<List<Cluster>> clustersFuture =
+        testEnvRule
+            .env()
+            .getInstanceAdminClient()
+            .listClustersAsync(testEnvRule.env().getInstanceId());
+
+    List<Cluster> clusters = clustersFuture.get(1, TimeUnit.MINUTES);
+
+    // give opencensus some time to populate view data
+    Thread.sleep(100);
+
+    List<String> tagValueStrings = StatsWrapper.getOperationLatencyViewTagValueStrings();
+    assertThat(tagValueStrings).contains(clusters.get(0).getZone());
+    assertThat(tagValueStrings).contains(clusters.get(0).getId());
+  }
+
+  @Test
+  public void testFailure() throws InterruptedException {
+    Query query = Query.create("non-exist-table");
+    try {
+      Lists.newArrayList(testEnvRule.env().getDataClient().readRows(query));
+    } catch (NotFoundException e) {
+    }
+
+    // give opencensus some time to populate view data
+    Thread.sleep(100);
+
+    List<String> tagValueStrings = StatsWrapper.getOperationLatencyViewTagValueStrings();
+    assertThat(tagValueStrings).contains("undefined");
+    assertThat(tagValueStrings).contains("undefined");
+  }
+}
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2022 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
+ *
+ *     https://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 com.google.cloud.bigtable.data.v2.it;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.TruthJUnit.assume;
+
+import com.google.api.core.ApiFuture;
+import com.google.api.gax.rpc.NotFoundException;
+import com.google.cloud.bigtable.admin.v2.models.Cluster;
+import com.google.cloud.bigtable.data.v2.models.RowMutation;
+import com.google.cloud.bigtable.stats.BuiltinViews;
+import com.google.cloud.bigtable.stats.StatsWrapper;
+import com.google.cloud.bigtable.test_helpers.env.EmulatorEnv;
+import com.google.cloud.bigtable.test_helpers.env.TestEnvRule;
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+import org.junit.BeforeClass;
+import org.junit.ClassRule;
+import org.junit.Test;
+
+public class UnaryMetricsMetadataIT {
+  @ClassRule public static TestEnvRule testEnvRule = new TestEnvRule();
+
+  @BeforeClass
+  public static void setUpClass() {
+    assume()
+        .withMessage("UnaryMetricsMetadataIT is not supported on Emulator")
+        .that(testEnvRule.env())
+        .isNotInstanceOf(EmulatorEnv.class);
+    BuiltinViews.registerBigtableBuiltinViews();
+  }
+
+  @Test
+  public void testSuccess() throws Exception {
+    String rowKey = UUID.randomUUID().toString();
+    String familyId = testEnvRule.env().getFamilyId();
+
+    ApiFuture<Void> future =
+        testEnvRule
+            .env()
+            .getDataClient()
+            .mutateRowCallable()
+            .futureCall(
+                RowMutation.create(testEnvRule.env().getTableId(), rowKey)
+                    .setCell(familyId, "q", "myVal"));
+
+    future.get(1, TimeUnit.MINUTES);
+
+    ApiFuture<List<Cluster>> clustersFuture =
+        testEnvRule
+            .env()
+            .getInstanceAdminClient()
+            .listClustersAsync(testEnvRule.env().getInstanceId());
+    List<Cluster> clusters = clustersFuture.get(1, TimeUnit.MINUTES);
+
+    // give opencensus some time to populate view data
+    Thread.sleep(100);
+
+    List<String> tagValueStrings = StatsWrapper.getOperationLatencyViewTagValueStrings();
+    assertThat(tagValueStrings).contains(clusters.get(0).getZone());
+    assertThat(tagValueStrings).contains(clusters.get(0).getId());
+  }
+
+  @Test
+  public void testFailure() throws InterruptedException {
+    String rowKey = UUID.randomUUID().toString();
+    String familyId = testEnvRule.env().getFamilyId();
+
+    try {
+      testEnvRule
+          .env()
+          .getDataClient()
+          .mutateRowCallable()
+          .call(RowMutation.create("non-exist-table", rowKey).setCell(familyId, "q", "myVal"));
+    } catch (NotFoundException e) {
+    }
+
+    // give opencensus some time to populate view data
+    Thread.sleep(100);
+
+    List<String> tagValueStrings = StatsWrapper.getOperationLatencyViewTagValueStrings();
+    assertThat(tagValueStrings).contains("undefined");
+    assertThat(tagValueStrings).contains("undefined");
+  }
+}