feat: add instrumentation for a couple of OpenTelemetry metrics (#2501)

* feat: add instrumentation for a couple OpenTelemetry metrics

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

README.md

@@ -57,13 +57,13 @@ implementation 'com.google.cloud:google-cloud-bigquerystorage'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-bigquerystorage:3.5.1'
+implementation 'com.google.cloud:google-cloud-bigquerystorage:3.5.2'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-bigquerystorage" % "3.5.1"
+libraryDependencies += "com.google.cloud" % "google-cloud-bigquerystorage" % "3.5.2"
 ```
 <!-- {x-version-update-end} -->
 
@@ -221,7 +221,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-bigquerystorage/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-bigquerystorage.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-bigquerystorage/3.5.1
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-bigquerystorage/3.5.2
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
 [predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles

google-cloud-bigquerystorage/pom.xml

@@ -156,6 +156,10 @@
     <artifactId>google-auth-library-credentials</artifactId>
     <version>1.23.0</version>
   </dependency>
+    <dependency>
+      <groupId>io.opentelemetry</groupId>
+      <artifactId>opentelemetry-api</artifactId>
+    </dependency>
 
     <!-- Test dependencies -->
     <dependency>

google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/ConnectionWorker.java

@@ -36,13 +36,21 @@
 import io.grpc.Status;
 import io.grpc.Status.Code;
 import io.grpc.StatusRuntimeException;
+import io.opentelemetry.api.common.AttributeKey;
+import io.opentelemetry.api.common.Attributes;
+import io.opentelemetry.api.common.AttributesBuilder;
+import io.opentelemetry.api.metrics.LongCounter;
+import io.opentelemetry.api.metrics.Meter;
+import io.opentelemetry.api.metrics.MeterProvider;
 import java.io.IOException;
 import java.time.Duration;
 import java.time.Instant;
+import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.Deque;
 import java.util.HashMap;
 import java.util.LinkedList;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
@@ -253,6 +261,24 @@ class ConnectionWorker implements AutoCloseable {
   static final Pattern DEFAULT_STREAM_PATTERN =
       Pattern.compile("projects/([^/]+)/datasets/([^/]+)/tables/([^/]+)/(streams/)?_default$");
 
+  private static String tableMatching = "(projects/[^/]+/datasets/[^/]+/tables/[^/]+)/";
+  private static Pattern streamPatternTable = Pattern.compile(tableMatching);
+  private Meter writeMeter;
+  static AttributeKey<String> telemetryKeyTableId = AttributeKey.stringKey("table_id");
+  private static String dataflowPrefix = "dataflow:";
+  static List<AttributeKey<String>> telemetryKeysTraceId =
+      new ArrayList<AttributeKey<String>>() {
+        {
+          add(AttributeKey.stringKey("trace_field_1"));
+          add(AttributeKey.stringKey("trace_field_2"));
+          add(AttributeKey.stringKey("trace_field_3"));
+        }
+      };
+  private Attributes telemetryAttributes;
+  private LongCounter instrumentIncomingRequestCount;
+  private LongCounter instrumentIncomingRequestSize;
+  private LongCounter instrumentIncomingRequestRows;
+
   public static Boolean isDefaultStreamName(String streamName) {
     Matcher matcher = DEFAULT_STREAM_PATTERN.matcher(streamName);
     return matcher.matches();
@@ -278,6 +304,85 @@ static String getRoutingHeader(String streamName, String location) {
     return project + "locations/" + location;
   }
 
+  private String getTableName() {
+    Matcher tableMatcher = streamPatternTable.matcher(this.streamName);
+    return tableMatcher.find() ? tableMatcher.group(1) : "";
+  }
+
+  private void setTraceIdAttributesPart(
+      AttributesBuilder builder,
+      String[] traceIdParts,
+      int indexPartsToCheck,
+      int indexTelemetryKeysToUse) {
+    if ((indexPartsToCheck < traceIdParts.length) && !traceIdParts[indexPartsToCheck].isEmpty()) {
+      builder.put(
+          telemetryKeysTraceId.get(indexTelemetryKeysToUse), traceIdParts[indexPartsToCheck]);
+    }
+  }
+
+  private void setTraceIdAttributes(AttributesBuilder builder) {
+    if ((this.traceId != null) && !this.traceId.isEmpty()) {
+      int indexDataflow = this.traceId.toLowerCase().indexOf(dataflowPrefix);
+      if (indexDataflow >= 0) {
+        String[] traceIdParts =
+            this.traceId.substring(indexDataflow + dataflowPrefix.length()).split(":", 8);
+        setTraceIdAttributesPart(builder, traceIdParts, 0, 0);
+        setTraceIdAttributesPart(builder, traceIdParts, 1, 1);
+        setTraceIdAttributesPart(builder, traceIdParts, 2, 2);
+      }
+    }
+  }
+
+  private Attributes buildOpenTelemetryAttributes() {
+    AttributesBuilder builder = Attributes.builder();
+    String tableName = getTableName();
+    if (!tableName.isEmpty()) {
+      builder.put(telemetryKeyTableId, tableName);
+    }
+    setTraceIdAttributes(builder);
+    return builder.build();
+  }
+
+  private void refreshOpenTelemetryTableNameAttributes() {
+    String tableName = getTableName();
+    if (!tableName.isEmpty()
+        && !tableName.equals(getTelemetryAttributes().get(telemetryKeyTableId))) {
+      AttributesBuilder builder = getTelemetryAttributes().toBuilder();
+      builder.put(telemetryKeyTableId, tableName);
+      this.telemetryAttributes = builder.build();
+    }
+  }
+
+  @VisibleForTesting
+  Attributes getTelemetryAttributes() {
+    return telemetryAttributes;
+  }
+
+  private void registerOpenTelemetryMetrics() {
+    MeterProvider meterProvider = Singletons.getOpenTelemetry().getMeterProvider();
+    writeMeter =
+        meterProvider
+            .meterBuilder("com.google.cloud.bigquery.storage.v1.write")
+            .setInstrumentationVersion(
+                ConnectionWorker.class.getPackage().getImplementationVersion())
+            .build();
+    instrumentIncomingRequestCount =
+        writeMeter
+            .counterBuilder("append_requests")
+            .setDescription("Counts number of incoming requests")
+            .build();
+    instrumentIncomingRequestSize =
+        writeMeter
+            .counterBuilder("append_request_bytes")
+            .setDescription("Counts byte size of incoming requests")
+            .build();
+    instrumentIncomingRequestRows =
+        writeMeter
+            .counterBuilder("append_rows")
+            .setDescription("Counts number of incoming request rows")
+            .build();
+  }
+
   public ConnectionWorker(
       String streamName,
       String location,
@@ -312,6 +417,9 @@ public ConnectionWorker(
     this.inflightRequestQueue = new LinkedList<AppendRequestAndResponse>();
     this.compressorName = compressorName;
     this.retrySettings = retrySettings;
+    this.telemetryAttributes = buildOpenTelemetryAttributes();
+    registerOpenTelemetryMetrics();
+
     // Always recreate a client for connection worker.
     HashMap<String, String> newHeaders = new HashMap<>();
     newHeaders.putAll(clientSettings.toBuilder().getHeaderProvider().getHeaders());
@@ -507,6 +615,9 @@ private ApiFuture<AppendRowsResponse> appendInternal(
                           + requestWrapper.messageSize)));
       return requestWrapper.appendResult;
     }
+    instrumentIncomingRequestCount.add(1, getTelemetryAttributes());
+    instrumentIncomingRequestSize.add(requestWrapper.messageSize, getTelemetryAttributes());
+    instrumentIncomingRequestRows.add(message.getProtoRows().getRows().getSerializedRowsCount());
     this.lock.lock();
     try {
       if (userClosed) {
@@ -783,6 +894,7 @@ private void appendLoop() {
             || (originalRequest.getProtoRows().hasWriterSchema()
                 && !originalRequest.getProtoRows().getWriterSchema().equals(writerSchema))) {
           streamName = originalRequest.getWriteStream();
+          refreshOpenTelemetryTableNameAttributes();
           writerSchema = originalRequest.getProtoRows().getWriterSchema();
           isMultiplexing = true;
           firstRequestForTableOrSchemaSwitch = true;

google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/ConnectionWorkerPool.java

@@ -27,6 +27,7 @@
 import com.google.common.base.Stopwatch;
 import com.google.common.collect.ImmutableList;
 import com.google.common.util.concurrent.MoreExecutors;
+import io.opentelemetry.api.common.Attributes;
 import java.io.IOException;
 import java.util.Collections;
 import java.util.Comparator;
@@ -238,9 +239,7 @@ ApiFuture<AppendRowsResponse> append(StreamWriter streamWriter, ProtoRows rows)
     return append(streamWriter, rows, -1);
   }
 
-  /** Distributes the writing of a message to an underlying connection. */
-  ApiFuture<AppendRowsResponse> append(StreamWriter streamWriter, ProtoRows rows, long offset) {
-    // We are in multiplexing mode after entering the following logic.
+  ConnectionWorker getConnectionWorker(StreamWriter streamWriter) {
     ConnectionWorker connectionWorker;
     lock.lock();
     try {
@@ -277,6 +276,13 @@ ApiFuture<AppendRowsResponse> append(StreamWriter streamWriter, ProtoRows rows,
     } finally {
       lock.unlock();
     }
+    return connectionWorker;
+  }
+
+  /** Distributes the writing of a message to an underlying connection. */
+  ApiFuture<AppendRowsResponse> append(StreamWriter streamWriter, ProtoRows rows, long offset) {
+    // We are in multiplexing mode after entering the following logic.
+    ConnectionWorker connectionWorker = getConnectionWorker(streamWriter);
     Stopwatch stopwatch = Stopwatch.createStarted();
     ApiFuture<AppendRowsResponse> responseFuture =
         connectionWorker.append(streamWriter, rows, offset);
@@ -294,6 +300,12 @@ ApiFuture<AppendRowsResponse> append(StreamWriter streamWriter, ProtoRows rows,
         MoreExecutors.directExecutor());
   }
 
+  @VisibleForTesting
+  Attributes getTelemetryAttributes(StreamWriter streamWriter) {
+    ConnectionWorker connectionWorker = getConnectionWorker(streamWriter);
+    return connectionWorker.getTelemetryAttributes();
+  }
+
   /**
    * Create a new connection if we haven't reached current maximum, or reuse an existing connection
    * with least load.

google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/Singletons.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2024 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.bigquery.storage.v1;
+
+import io.opentelemetry.api.GlobalOpenTelemetry;
+import io.opentelemetry.api.OpenTelemetry;
+import java.util.logging.Logger;
+
+/** Container for global singleton objects. */
+class Singletons {
+
+  private static final Logger log = Logger.getLogger(Singletons.class.getName());
+
+  // Global OpenTelemetry instance
+  private static OpenTelemetry openTelemetry = null;
+
+  static OpenTelemetry getOpenTelemetry() {
+    if (openTelemetry == null) {
+      openTelemetry = GlobalOpenTelemetry.get();
+    }
+    return openTelemetry;
+  }
+}

google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/StreamWriter.java

@@ -34,6 +34,7 @@
 import io.grpc.Status;
 import io.grpc.Status.Code;
 import io.grpc.StatusRuntimeException;
+import io.opentelemetry.api.common.Attributes;
 import java.io.IOException;
 import java.time.Duration;
 import java.util.HashMap;
@@ -172,6 +173,15 @@ public ApiFuture<AppendRowsResponse> append(
       }
     }
 
+    @VisibleForTesting
+    Attributes getTelemetryAttributes(StreamWriter streamWriter) {
+      if (getKind() == Kind.CONNECTION_WORKER) {
+        return connectionWorker().getTelemetryAttributes();
+      } else {
+        return connectionWorkerPool().getTelemetryAttributes(streamWriter);
+      }
+    }
+
     public void close(StreamWriter streamWriter) {
       if (getKind() == Kind.CONNECTION_WORKER) {
         connectionWorker().close();
@@ -459,6 +469,11 @@ public ApiFuture<AppendRowsResponse> append(ProtoRows rows, long offset) {
     return this.singleConnectionOrConnectionPool.append(this, rows, offset);
   }
 
+  @VisibleForTesting
+  Attributes getTelemetryAttributes() {
+    return this.singleConnectionOrConnectionPool.getTelemetryAttributes(this);
+  }
+
   /**
    * Returns the wait of a request in Client side before sending to the Server. Request could wait
    * in Client because it reached the client side inflight request limit (adjustable when