Ship dd-openfeature as a standalone SDK extended by the Java agent (AI prototype)

.github/CODEOWNERS

@@ -340,8 +340,10 @@
 /dd-smoke-tests/kafka-3/                                        @DataDog/data-streams-monitoring @DataDog/apm-idm-java
 
 # @DataDog/feature-flagging-and-experimentation-sdk
+/dd-openfeature/                                                @DataDog/feature-flagging-and-experimentation-sdk
 /dd-smoke-tests/openfeature/                                    @DataDog/feature-flagging-and-experimentation-sdk
 /products/feature-flagging/                                     @DataDog/feature-flagging-and-experimentation-sdk
+/dd-java-agent/instrumentation/datadog/openfeature/             @DataDog/feature-flagging-and-experimentation-sdk
 
 # @DataDog/profiling-java
 /dd-java-agent/ddprof-lib/                                                                  @DataDog/profiling-java

.github/workflows/run-system-tests.yaml

@@ -49,8 +49,11 @@ jobs:
           JAVA_11_HOME=$JAVA_HOME_11_X64 \
           JAVA_17_HOME=$JAVA_HOME_17_X64 \
           JAVA_21_HOME=$JAVA_HOME_21_X64 \
-          ./gradlew clean :dd-java-agent:shadowJar \
+          ./gradlew clean :dd-java-agent:shadowJar :dd-openfeature:jar \
             --build-cache --parallel --stacktrace --no-daemon --max-workers=4
+          # System tests install a dd-openfeature jar found next to the agent instead of the published one,
+          # as the agent supports only the dd-openfeature version built along with it.
+          cp workspace/dd-openfeature/build/libs/dd-openfeature-*.jar workspace/dd-java-agent/build/libs/
 
       - name: Upload artifact
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a

.gitlab-ci.yml

@@ -355,7 +355,7 @@ build:
   script:
     - if [ $CI_PIPELINE_SOURCE == "schedule" ] ; then ./gradlew resolveAndLockAll --write-locks $GRADLE_ARGS; fi
     - ./gradlew --version
-    - ./gradlew clean :dd-java-agent:shadowJar :dd-java-agent:check :dd-trace-api:jar :dd-trace-ot:shadowJar :products:feature-flagging:feature-flagging-api:jar -PskipTests -x spotlessCheck $GRADLE_ARGS
+    - ./gradlew clean :dd-java-agent:shadowJar :dd-java-agent:check :dd-trace-api:jar :dd-trace-ot:shadowJar :dd-openfeature:jar -PskipTests -x spotlessCheck $GRADLE_ARGS
     - echo UPSTREAM_TRACER_VERSION=$(java -jar workspace/dd-java-agent/build/libs/*.jar) >> upstream.env
     - echo "BUILD_JOB_NAME=$CI_JOB_NAME" >> build.env
     - echo "BUILD_JOB_ID=$CI_JOB_ID" >> build.env
@@ -365,7 +365,7 @@ build:
       - 'workspace/dd-java-agent/build/libs/*.jar'
       - 'workspace/dd-trace-api/build/libs/*.jar'
       - 'workspace/dd-trace-ot/build/libs/*.jar'
-      - 'workspace/products/feature-flagging/feature-flagging-api/build/libs/*.jar'
+      - 'workspace/dd-openfeature/build/libs/*.jar'
       - 'upstream.env'
       - '.gradle/daemon/*/*.out.log'
     reports:
@@ -482,11 +482,11 @@ publish-artifacts-to-s3:
     - aws s3 cp workspace/dd-java-agent/build/libs/dd-java-agent-${VERSION}.jar s3://dd-trace-java-builds/${CI_COMMIT_REF_NAME}/dd-java-agent.jar
     - aws s3 cp workspace/dd-trace-api/build/libs/dd-trace-api-${VERSION}.jar s3://dd-trace-java-builds/${CI_COMMIT_REF_NAME}/dd-trace-api.jar
     - aws s3 cp workspace/dd-trace-ot/build/libs/dd-trace-ot-${VERSION}.jar s3://dd-trace-java-builds/${CI_COMMIT_REF_NAME}/dd-trace-ot.jar
-    - aws s3 cp workspace/products/feature-flagging/feature-flagging-api/build/libs/dd-openfeature-${VERSION}.jar s3://dd-trace-java-builds/${CI_COMMIT_REF_NAME}/dd-openfeature.jar
+    - aws s3 cp workspace/dd-openfeature/build/libs/dd-openfeature-${VERSION}.jar s3://dd-trace-java-builds/${CI_COMMIT_REF_NAME}/dd-openfeature.jar
     - aws s3 cp workspace/dd-java-agent/build/libs/dd-java-agent-${VERSION}.jar s3://dd-trace-java-builds/${CI_PIPELINE_ID}/dd-java-agent.jar
     - aws s3 cp workspace/dd-trace-api/build/libs/dd-trace-api-${VERSION}.jar s3://dd-trace-java-builds/${CI_PIPELINE_ID}/dd-trace-api.jar
     - aws s3 cp workspace/dd-trace-ot/build/libs/dd-trace-ot-${VERSION}.jar s3://dd-trace-java-builds/${CI_PIPELINE_ID}/dd-trace-ot.jar
-    - aws s3 cp workspace/products/feature-flagging/feature-flagging-api/build/libs/dd-openfeature-${VERSION}.jar s3://dd-trace-java-builds/${CI_PIPELINE_ID}/dd-openfeature.jar
+    - aws s3 cp workspace/dd-openfeature/build/libs/dd-openfeature-${VERSION}.jar s3://dd-trace-java-builds/${CI_PIPELINE_ID}/dd-openfeature.jar
     - |
       cat << EOF > links.json 
         {

ARCHITECTURE.md

@@ -64,7 +64,8 @@ to `.classdata` to prevent unintended loading. See [`docs/how_to_work_with_gradl
 
 - **`agent-tooling/`** — Instrumentation framework. Key types:
   - `InstrumenterModule` — Base class for all instrumentation modules. Declares a target system
-    (Tracing, AppSec, IAST, Profiling, CiVisibility, USM, etc.) and one or more instrumentations.
+    (Tracing, AppSec, IAST, Profiling, CiVisibility, USM, FeatureFlags, etc.) and one or more
+    instrumentations.
   - `Instrumenter` — Type matching interface: `ForSingleType`, `ForKnownTypes`,
     `ForTypeHierarchy`, `ForBootstrap`.
   - `muzzle/` — Build-time and runtime safety checks. Verifies that expected types and methods
@@ -229,9 +230,8 @@ Current products:
 
 - `metrics/` — StatsD client and monitoring abstraction. Provides `Monitoring` interface with
   counters, timers, and histograms for internal agent metrics collection.
-- `feature-flagging/` — Server-side feature flag evaluation driven by remote configuration.
-  Implements the OpenFeature SDK, handles the Unified Feature Control (UFC) protocol,
-  and tracks flag exposure per user/session.
+- `feature-flagging/` — Agent services for the [`dd-openfeature/`](#dd-openfeature) SDK:
+  remote configuration, event delivery through the Datadog Agent, and span enrichment.
 
 ### `communication/`
 
@@ -279,6 +279,12 @@ that implements the `io.opentracing.Tracer` interface by wrapping the Datadog `C
 This is a pure library for manual instrumentation only — there is no auto-instrumentation or
 bytecode advice.
 
+### `dd-openfeature/`
+
+Feature Flags OpenFeature provider. Publishes a standalone JAR artifact (`dd-openfeature.jar`, Java 11+)
+that works without the agent. When the agent is attached, an instrumentation connects it to the
+`products/feature-flagging/` agent services.
+
 ### `dd-smoke-tests/`
 
 End-to-end smoke tests. Each boots a real application with the agent jar and verifies traces, spans,

dd-java-agent/agent-bootstrap/src/main/java/datadog/trace/bootstrap/Agent.java

@@ -44,7 +44,6 @@
 import datadog.trace.api.config.TraceInstrumentationConfig;
 import datadog.trace.api.config.TracerConfig;
 import datadog.trace.api.config.UsmConfig;
-import datadog.trace.api.featureflag.config.FeatureFlaggingConfig;
 import datadog.trace.api.gateway.RequestContextSlot;
 import datadog.trace.api.gateway.SubscriptionService;
 import datadog.trace.api.git.EmbeddedGitInfoBuilder;
@@ -194,7 +193,7 @@ public boolean isEnabledByDefault() {
   private static boolean distributedDebuggerEnabled = false;
   private static boolean agentlessLogSubmissionEnabled = false;
   private static boolean appLogsCollectionEnabled = false;
-  private static boolean featureFlaggingEnabled = false;
+  private static volatile boolean featureFlaggingEnabled = false;
 
   private static void safelySetContextClassLoader(ClassLoader classLoader) {
     try {
@@ -283,7 +282,6 @@ public static void start(
     agentlessLogSubmissionEnabled = isFeatureEnabled(AgentFeature.AGENTLESS_LOG_SUBMISSION);
     appLogsCollectionEnabled = isFeatureEnabled(AgentFeature.APP_LOGS_COLLECTION);
     llmObsEnabled = isFeatureEnabled(AgentFeature.LLMOBS);
-    featureFlaggingEnabled = isFeatureFlaggingEnabled();
 
     // setup writers when llmobs is enabled to accomodate apm and llmobs
     if (llmObsEnabled) {
@@ -1275,6 +1273,7 @@ private static void maybeStartLLMObs(Instrumentation inst, Class<?> scoClass, Ob
   }
 
   private static void maybeStartFeatureFlagging(final Class<?> scoClass, final Object sco) {
+    featureFlaggingEnabled = Config.get().isFeatureFlaggingProviderEnabled();
     if (featureFlaggingEnabled) {
       StaticEventLogger.begin("Feature Flagging");
 
@@ -1730,45 +1729,6 @@ private static boolean isFeatureEnabled(AgentFeature feature) {
     }
   }
 
-  private static boolean isFeatureFlaggingEnabled() {
-    final Boolean providerEnabled =
-        featureFlaggingBooleanSetting(FeatureFlaggingConfig.FEATURE_FLAGS_ENABLED);
-    final String configurationSource =
-        featureFlaggingSetting(FeatureFlaggingConfig.FEATURE_FLAGS_CONFIGURATION_SOURCE);
-    final Boolean legacyProviderEnabled =
-        featureFlaggingBooleanSetting(FeatureFlaggingConfig.EXPERIMENTAL_FLAGGING_PROVIDER_ENABLED);
-
-    return FeatureFlaggingConfig.resolveConfiguration(
-            providerEnabled, configurationSource, legacyProviderEnabled)
-        .isEnabled();
-  }
-
-  @SuppressFBWarnings(
-      value = "NP_BOOLEAN_RETURN_NULL",
-      justification = "A null value preserves the distinction between absent and explicitly false")
-  private static Boolean featureFlaggingBooleanSetting(final String configKey) {
-    final String value = featureFlaggingSetting(configKey);
-    if (value == null) {
-      return null;
-    }
-    return Boolean.parseBoolean(value) || "1".equals(value);
-  }
-
-  private static String featureFlaggingSetting(final String configKey) {
-    final String systemProperty = propertyNameToSystemPropertyName(configKey);
-    String value = SystemProperties.get(systemProperty);
-    if (value == null) {
-      value = getStableConfig(FLEET, configKey);
-    }
-    if (value == null) {
-      value = ddGetEnv(systemProperty);
-    }
-    if (value == null) {
-      value = getStableConfig(LOCAL, configKey);
-    }
-    return value;
-  }
-
   /**
    * @see datadog.trace.api.ProductActivation#fromString(String)
    */

dd-java-agent/agent-installer/src/main/java/datadog/trace/agent/tooling/AgentInstaller.java

@@ -359,6 +359,9 @@ public static Set<InstrumenterModule.TargetSystem> getEnabledSystems() {
     if (cfg.isLlmObsEnabled()) {
       enabledSystems.add(InstrumenterModule.TargetSystem.LLMOBS);
     }
+    if (cfg.isFeatureFlaggingEnabled()) {
+      enabledSystems.add(InstrumenterModule.TargetSystem.FEATURE_FLAGS);
+    }
     return enabledSystems;
   }
 

dd-java-agent/agent-tooling/src/main/java/datadog/trace/agent/tooling/InstrumenterModule.java

@@ -44,6 +44,7 @@ public abstract class InstrumenterModule implements Instrumenter {
    *   <li>{@link TargetSystem#USM usm}
    *   <li>{@link TargetSystem#CONTEXT_TRACKING context-tracking}
    *   <li>{@link TargetSystem#RASP rasp}
+   *   <li>{@link TargetSystem#FEATURE_FLAGS feature-flags}
    * </ul>
    */
   public enum TargetSystem {
@@ -56,6 +57,7 @@ public enum TargetSystem {
     LLMOBS,
     CONTEXT_TRACKING,
     RASP,
+    FEATURE_FLAGS,
   }
 
   private static final Logger log = LoggerFactory.getLogger(InstrumenterModule.class);

dd-java-agent/instrumentation/datadog/openfeature/dd-openfeature-connector/build.gradle

@@ -0,0 +1,39 @@
+plugins {
+  id 'dd-trace-java.module.instrumentation'
+  id 'idea'
+}
+
+idea {
+  module {
+    jdkName = '11'
+  }
+}
+
+// TODO Add a muzzle pass directive on com.datadoghq:dd-openfeature once the SDK is published.
+
+tracerJava {
+  addSourceSetFor(JavaVersion.VERSION_11)
+}
+
+testJvmConstraints {
+  minJavaVersion = JavaVersion.VERSION_11
+}
+
+dependencies {
+  main_java11CompileOnly project(':dd-openfeature')
+  main_java11CompileOnly project(':products:feature-flagging:feature-flagging-bootstrap')
+  main_java11CompileOnly libs.spotbugs.annotations
+
+  testImplementation project(':dd-openfeature')
+  testImplementation project(':products:feature-flagging:feature-flagging-bootstrap')
+  testImplementation project(':products:feature-flagging:feature-flagging-config')
+  testImplementation libs.bundles.mockito
+}
+
+tasks.named("compileMain_java11Java", JavaCompile) {
+  configureCompiler(it, JavaVersion.VERSION_11)
+}
+
+tasks.named("compileTestJava", JavaCompile) {
+  configureCompiler(it, JavaVersion.VERSION_11)
+}