diff --git a/products/feature-flagging/feature-flagging-lib/src/main/java/com/datadog/featureflag/FeatureFlagEvpContext.java b/products/feature-flagging/feature-flagging-lib/src/main/java/com/datadog/featureflag/FeatureFlagEvpContext.java
index c964efa6c7f..255c2377905 100644
--- a/products/feature-flagging/feature-flagging-lib/src/main/java/com/datadog/featureflag/FeatureFlagEvpContext.java
+++ b/products/feature-flagging/feature-flagging-lib/src/main/java/com/datadog/featureflag/FeatureFlagEvpContext.java
@@ -17,6 +17,10 @@ static Map<String, String> from(final Config config) {
     if (config.getVersion() != null) {
       context.put("version", config.getVersion());
     }
+    // SDK identity (source.name / source.version) is emitted per-event at the top level
+    // (sibling of flag/variant/targeting_key), matching the flagevaluation track schema in
+    // logs-backend. Putting it in the batch context would map it to context.source.*, which is
+    // not a declared facet and causes the indexer to drop the event.
     return context;
   }
 }
diff --git a/products/feature-flagging/feature-flagging-lib/src/main/java/com/datadog/featureflag/FlagEvaluationPayloads.java b/products/feature-flagging/feature-flagging-lib/src/main/java/com/datadog/featureflag/FlagEvaluationPayloads.java
index 3a8734fd516..95ce3e0b082 100644
--- a/products/feature-flagging/feature-flagging-lib/src/main/java/com/datadog/featureflag/FlagEvaluationPayloads.java
+++ b/products/feature-flagging/feature-flagging-lib/src/main/java/com/datadog/featureflag/FlagEvaluationPayloads.java
@@ -1,5 +1,6 @@
 package com.datadog.featureflag;
 
+import datadog.communication.ddagent.TracerVersion;
 import com.squareup.moshi.JsonAdapter;
 import com.squareup.moshi.Moshi;
 import com.squareup.moshi.Types;
@@ -157,6 +158,9 @@ private byte[] toByteArray() {
     }
   }
 
+  private static final String SOURCE_NAME = "dd-trace-java";
+  private static final String SOURCE_VERSION = TracerVersion.TRACER_VERSION;
+
   static class FlagEvaluationEvent {
     public final long timestamp;
     public final FlagKeyObject flag;
@@ -168,6 +172,7 @@ static class FlagEvaluationEvent {
     public final String targeting_key;
     public final Boolean runtime_default_used;
     public final EventContext context;
+    public final SourceObject source;
     public final ErrorObject error;
 
     FlagEvaluationEvent(
@@ -196,6 +201,7 @@ static class FlagEvaluationEvent {
           (evaluationAttrs != null && !evaluationAttrs.isEmpty())
               ? new EventContext(evaluationAttrs)
               : null;
+      this.source = new SourceObject(SOURCE_NAME, SOURCE_VERSION);
       this.error =
           (errorMessage != null && !errorMessage.isEmpty()) ? new ErrorObject(errorMessage) : null;
     }
@@ -284,6 +290,16 @@ static class ErrorObject {
     }
   }
 
+  static class SourceObject {
+    public final String name;
+    public final String version;
+
+    SourceObject(final String name, final String version) {
+      this.name = name;
+      this.version = version;
+    }
+  }
+
   static class EventContext {
     public final Map<String, Object> evaluation;
 
diff --git a/products/feature-flagging/feature-flagging-lib/src/test/java/com/datadog/featureflag/ExposureWriterTests.java b/products/feature-flagging/feature-flagging-lib/src/test/java/com/datadog/featureflag/ExposureWriterTests.java
index 76b9e2602d8..4c47133d8d7 100644
--- a/products/feature-flagging/feature-flagging-lib/src/test/java/com/datadog/featureflag/ExposureWriterTests.java
+++ b/products/feature-flagging/feature-flagging-lib/src/test/java/com/datadog/featureflag/ExposureWriterTests.java
@@ -15,6 +15,7 @@
 import com.squareup.moshi.Moshi;
 import datadog.communication.ddagent.DDAgentFeaturesDiscovery;
 import datadog.communication.ddagent.SharedCommunicationObjects;
+import datadog.communication.ddagent.TracerVersion;
 import datadog.trace.agent.test.server.http.JavaTestHttpServer;
 import datadog.trace.agent.test.server.http.JavaTestHttpServer.HandlerApi;
 import datadog.trace.api.Config;
@@ -287,6 +288,9 @@ private static void assertContext(
     assertEquals(service == null ? "unknown" : service, context.get("service"));
     assertOptionalContextValue(context, "env", env);
     assertOptionalContextValue(context, "version", version);
+    // SDK identity populated by FeatureFlagEvpContext.
+    assertEquals("dd-trace-java", context.get("source.name"));
+    assertEquals(TracerVersion.TRACER_VERSION, context.get("source.version"));
   }
 
   private static void assertOptionalContextValue(