chore: (do not merge) tracing and artifact name POC

gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/common/AbstractServiceStubSettingsClassComposer.java

@@ -209,6 +209,7 @@ public GapicClass generate(GapicContext context, Service service) {
                     service, serviceConfig, methodSettingsMemberVarExprs, messageTypes, typeStore))
             .setMethods(
                 createClassMethods(
+                    context,
                     service,
                     methodSettingsMemberVarExprs,
                     deprecatedSettingVarNames,
@@ -1033,6 +1034,7 @@ private static Expr createPagedListResponseFactoryAssignExpr(
   }
 
   private List<MethodDefinition> createClassMethods(
+      GapicContext context,
       Service service,
       Map<String, VariableExpr> methodSettingsMemberVarExprs,
       Set<String> deprecatedSettingVarNames,
@@ -1043,7 +1045,7 @@ private List<MethodDefinition> createClassMethods(
         createMethodSettingsGetterMethods(
             methodSettingsMemberVarExprs, deprecatedSettingVarNames, internalSettingVarNames));
     javaMethods.add(createCreateStubMethod(service, typeStore));
-    javaMethods.addAll(createDefaultHelperAndGetterMethods(service, typeStore));
+    javaMethods.addAll(createDefaultHelperAndGetterMethods(context, service, typeStore));
     javaMethods.addAll(
         createNewBuilderMethods(
             service,
@@ -1185,7 +1187,7 @@ private MethodDefinition createCreateStubMethod(Service service, TypeStore typeS
   }
 
   private List<MethodDefinition> createDefaultHelperAndGetterMethods(
-      Service service, TypeStore typeStore) {
+      GapicContext context, Service service, TypeStore typeStore) {
     List<MethodDefinition> javaMethods = new ArrayList<>();
     TypeNode returnType;
 
@@ -1206,6 +1208,21 @@ private List<MethodDefinition> createDefaultHelperAndGetterMethods(
               .build());
     }
 
+    // Create the getArtifactName method.
+    if (context.artifactName().isPresent()) {
+      returnType = TypeNode.STRING;
+      javaMethods.add(
+          MethodDefinition.builder()
+              .setIsOverride(true)
+              .setScope(ScopeNode.PROTECTED)
+              .setIsStatic(false)
+              .setReturnType(returnType)
+              .setName("getArtifactName")
+              .setReturnExpr(
+                  ValueExpr.withValue(StringObjectValue.withValue(context.artifactName().get())))
+              .build());
+    }
+
     // Create the defaultExecutorProviderBuilder method.
     returnType =
         TypeNode.withReference(

gapic-generator-java/src/main/java/com/google/api/generator/gapic/model/GapicContext.java

@@ -60,6 +60,8 @@ public abstract class GapicContext {
 
   public abstract boolean restNumericEnumsEnabled();
 
+  public abstract Optional<String> artifactName();
+
   public GapicMetadata gapicMetadata() {
     return gapicMetadata;
   }
@@ -130,6 +132,8 @@ public Builder setHelperResourceNames(Set<ResourceName> helperResourceNames) {
 
     public abstract Builder setTransport(Transport transport);
 
+    public abstract Builder setArtifactName(Optional<String> artifactName);
+
     abstract ImmutableMap<String, ResourceName> resourceNames();
 
     abstract ImmutableMap<String, ResourceName> helperResourceNames();

gapic-generator-java/src/main/java/com/google/api/generator/gapic/protoparser/Parser.java

@@ -150,6 +150,7 @@ public static GapicContext parse(CodeGeneratorRequest request) {
     Optional<GapicLanguageSettings> languageSettingsOpt =
         GapicLanguageSettingsParser.parse(gapicYamlConfigPathOpt);
     Optional<String> transportOpt = PluginArgumentParser.parseTransport(request);
+    Optional<String> artifactNameOpt = PluginArgumentParser.parseArtifactName(request);
 
     boolean willGenerateMetadata = PluginArgumentParser.hasMetadataFlag(request);
     boolean willGenerateNumericEnum = PluginArgumentParser.hasNumericEnumFlag(request);
@@ -253,6 +254,7 @@ public static GapicContext parse(CodeGeneratorRequest request) {
         .setServiceYamlProto(serviceYamlProtoOpt.orElse(null))
         .setTransport(transport)
         .setRestNumericEnumsEnabled(willGenerateNumericEnum)
+        .setArtifactName(artifactNameOpt)
         .build();
   }
 

gapic-generator-java/src/main/java/com/google/api/generator/gapic/protoparser/PluginArgumentParser.java

@@ -26,6 +26,7 @@ public class PluginArgumentParser {
   private static final String EQUALS = "=";
 
   // Synced to rules_java_gapic/java_gapic.bzl.
+  @VisibleForTesting static final String KEY_ARTIFACT_NAME = "artifact-name";
   @VisibleForTesting static final String KEY_GRPC_SERVICE_CONFIG = "grpc-service-config";
   @VisibleForTesting static final String KEY_GAPIC_CONFIG = "gapic-config";
   @VisibleForTesting static final String KEY_METADATA = "metadata";
@@ -53,6 +54,10 @@ static Optional<String> parseTransport(CodeGeneratorRequest request) {
     return parseConfigArgument(request.getParameter(), KEY_TRANSPORT);
   }
 
+  static Optional<String> parseArtifactName(CodeGeneratorRequest request) {
+    return parseConfigArgument(request.getParameter(), KEY_ARTIFACT_NAME);
+  }
+
   static boolean hasMetadataFlag(CodeGeneratorRequest request) {
     return hasFlag(request.getParameter(), KEY_METADATA);
   }

gax-java/dependencies.properties

@@ -40,6 +40,7 @@ maven.com_google_api_grpc_grpc_google_common_protos=com.google.api.grpc:grpc-goo
 maven.com_google_auth_google_auth_library_oauth2_http=com.google.auth:google-auth-library-oauth2-http:1.42.1
 maven.com_google_auth_google_auth_library_credentials=com.google.auth:google-auth-library-credentials:1.42.1
 maven.io_opentelemetry_opentelemetry_api=io.opentelemetry:opentelemetry-api:1.47.0
+maven.io_opentelemetry_opentelemetry_context=io.opentelemetry:opentelemetry-context:1.47.0
 maven.io_opencensus_opencensus_api=io.opencensus:opencensus-api:0.31.1
 maven.io_opencensus_opencensus_contrib_grpc_metrics=io.opencensus:opencensus-contrib-grpc-metrics:0.31.1
 maven.io_opencensus_opencensus_contrib_http_util=io.opencensus:opencensus-contrib-http-util:0.31.1

gax-java/gax/BUILD.bazel

@@ -19,6 +19,7 @@ _COMPILE_DEPS = [
     "@com_google_errorprone_error_prone_annotations//jar",
     "@com_google_guava_guava//jar",
     "@io_opentelemetry_opentelemetry_api//jar",
+    "@io_opentelemetry_opentelemetry_context//jar",
     "@io_opencensus_opencensus_api//jar",
     "@io_opencensus_opencensus_contrib_http_util//jar",
     "@io_grpc_grpc_java//context:context",

gax-java/gax/src/main/java/com/google/api/gax/rpc/ClientContext.java

@@ -270,6 +270,13 @@ public static ClientContext create(StubSettings settings) throws IOException {
       backgroundResources.add(watchdog);
     }
 
+    ApiTracerFactory tracerFactory = settings.getTracerFactory();
+    if (!Strings.isNullOrEmpty(settings.getArtifactName())) {
+      tracerFactory =
+          tracerFactory.withAttributes(
+              ImmutableMap.of("gcp.client.artifact", settings.getArtifactName()));
+    }
+
     return newBuilder()
         .setBackgroundResources(backgroundResources.build())
         .setExecutor(backgroundExecutor)
@@ -284,7 +291,7 @@ public static ClientContext create(StubSettings settings) throws IOException {
         .setQuotaProjectId(settings.getQuotaProjectId())
         .setStreamWatchdog(watchdog)
         .setStreamWatchdogCheckIntervalDuration(settings.getStreamWatchdogCheckIntervalDuration())
-        .setTracerFactory(settings.getTracerFactory())
+        .setTracerFactory(tracerFactory)
         .setEndpointContext(endpointContext)
         .build();
   }

gax-java/gax/src/main/java/com/google/api/gax/rpc/StubSettings.java

@@ -176,6 +176,16 @@ protected String getServiceName() {
     return "";
   }
 
+  /**
+   * Marked with Internal Api and meant to be overridden by the generated subclasses. This getter is
+   * used to set the artifactName to the ClientContext. The value in generated StubSettings
+   * subclasses comes from the build configuration.
+   */
+  @InternalApi
+  protected String getArtifactName() {
+    return "";
+  }
+
   /**
    * @return the fully resolved universe domain used by the client
    */

gax-java/gax/src/main/java/com/google/api/gax/tracing/ApiTracerFactory.java

@@ -31,6 +31,7 @@
 
 import com.google.api.core.InternalApi;
 import com.google.api.core.InternalExtensionOnly;
+import java.util.Map;
 
 /**
  * A factory to create new instances of {@link ApiTracer}s.
@@ -61,4 +62,14 @@ enum OperationType {
    * @param operationType the type of operation that the tracer will trace
    */
   ApiTracer newTracer(ApiTracer parent, SpanName spanName, OperationType operationType);
+
+  /**
+   * Returns a new {@link ApiTracerFactory} that will add the given attributes to all tracers
+   * created by the factory.
+   *
+   * @param attributes the attributes to add to all tracers
+   */
+  default ApiTracerFactory withAttributes(Map<String, String> attributes) {
+    return this;
+  }
 }

gax-java/gax/src/main/java/com/google/api/gax/tracing/OpenTelemetryTracingRecorder.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google LLC nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.google.api.gax.tracing;
+
+import com.google.api.core.BetaApi;
+import com.google.api.core.InternalApi;
+import io.opentelemetry.api.OpenTelemetry;
+import io.opentelemetry.api.trace.Span;
+import io.opentelemetry.api.trace.SpanBuilder;
+import io.opentelemetry.api.trace.SpanKind;
+import io.opentelemetry.api.trace.StatusCode;
+import io.opentelemetry.api.trace.Tracer;
+import io.opentelemetry.context.Scope;
+
+import java.util.Map;
+
+/**
+ * OpenTelemetry implementation of recording traces. This implementation collects the measurements
+ * related to the lifecyle of an RPC.
+ */
+@BetaApi
+@InternalApi
+public class OpenTelemetryTracingRecorder implements TracingRecorder {
+  private final Tracer tracer;
+
+  public OpenTelemetryTracingRecorder(OpenTelemetry openTelemetry) {
+    this.tracer = openTelemetry.getTracer("gax-java");
+  }
+
+  @Override
+  @SuppressWarnings("MustBeClosedChecker") // Scope is closed later in the lifecycle
+  public SpanHandle startSpan(String name, Map<String, String> attributes) {
+    SpanBuilder spanBuilder =
+        tracer.spanBuilder(name).setSpanKind(SpanKind.CLIENT); // Mark as a network-facing call
+
+    if (attributes != null) {
+      attributes.forEach((k, v) -> spanBuilder.setAttribute(k, v));
+    }
+
+    Span span = spanBuilder.startSpan();
+    // makeCurrent() puts this span into the thread-local storage
+    Scope scope = span.makeCurrent();
+
+    return new OtelSpanHandle(span, scope);
+  }
+
+  private static class OtelSpanHandle implements SpanHandle {
+    private final Span span;
+    private final Scope scope;
+
+    private OtelSpanHandle(Span span, Scope scope) {
+      this.span = span;
+      this.scope = scope;
+    }
+
+    @Override
+    public void end() {
+      scope.close(); // Remove from thread-local storage
+      span.end();
+    }
+
+    @Override
+    public void recordError(Throwable error) {
+      span.recordException(error);
+      span.setStatus(StatusCode.ERROR);
+    }
+  }
+}

gax-java/gax/src/main/java/com/google/api/gax/tracing/OpenTelemetryTracingTracer.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google LLC nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.google.api.gax.tracing;
+
+import com.google.api.core.BetaApi;
+import com.google.api.core.InternalApi;
+import java.util.HashMap;
+import java.util.Map;
+
+@BetaApi
+@InternalApi
+public class OpenTelemetryTracingTracer implements ApiTracer {
+  private final TracingRecorder recorder;
+  private final Map<String, String> attributes;
+  private TracingRecorder.SpanHandle operationHandle;
+  private TracingRecorder.SpanHandle attemptHandle;
+
+  public OpenTelemetryTracingTracer(TracingRecorder recorder, String methodName) {
+    this.recorder = recorder;
+    this.attributes = new HashMap<>();
+    this.attributes.put("method", methodName);
+
+    // Start the long-lived operation span
+    this.operationHandle = recorder.startSpan(methodName + "/operation", attributes);
+  }
+
+  @Override
+  public void attemptStarted(Object request, int attemptNumber) {
+    // Start the specific attempt span
+    this.attemptHandle = recorder.startSpan(this.attributes.get("method") + "/attempt", attributes);
+  }
+
+  @Override
+  public void attemptSucceeded() {
+    if (attemptHandle != null) {
+      attemptHandle.end();
+    }
+  }
+
+  @Override
+  public void operationSucceeded() {
+    operationHandle.end();
+  }
+
+  @Override
+  public void operationFailed(Throwable error) {
+    operationHandle.recordError(error);
+    operationHandle.end();
+  }
+
+  public void addAttributes(Map<String, String> attributes) {
+    this.attributes.putAll(attributes);
+  }
+}