diff --git a/Cargo.lock b/Cargo.lock
index 057c1e06aa..6d512f8c6c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2922,6 +2922,7 @@ dependencies = [
  "tracing",
  "uuid",
  "web-time",
+ "zrip",
  "zstd",
 ]
 
@@ -3129,6 +3130,7 @@ dependencies = [
  "thiserror 2.0.18",
  "tokio",
  "tokio-util",
+ "zrip",
  "zstd",
 ]
 
@@ -3151,6 +3153,7 @@ dependencies = [
  "chrono",
  "futures",
  "futures-util",
+ "getrandom 0.2.15",
  "hashbrown 0.15.2",
  "http 1.4.2",
  "http-body-util",
@@ -3165,6 +3168,7 @@ dependencies = [
  "manual_future",
  "prost",
  "rand 0.8.5",
+ "ring",
  "serde",
  "serde_json",
  "serde_with",
@@ -3375,6 +3379,7 @@ dependencies = [
  "tokio",
  "tracing",
  "urlencoding",
+ "zrip",
  "zstd",
 ]
 
@@ -7203,6 +7208,41 @@ version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
 
+[[package]]
+name = "zrip"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "964fe9f1ea10a0d183fc143a7525266cbe16978883dbe304725da34b314c04cf"
+dependencies = [
+ "zrip-core",
+ "zrip-decode",
+ "zrip-encode",
+]
+
+[[package]]
+name = "zrip-core"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cbc201ba56175f86e67cc88bdaf1a7af9c061815c7dde719c7a6a1ed5aaa186b"
+
+[[package]]
+name = "zrip-decode"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "038f795e49887bdeaab197fff84c8165644484a98dc3f2354e5df3d2e5f4f978"
+dependencies = [
+ "zrip-core",
+]
+
+[[package]]
+name = "zrip-encode"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3dfdcbb503db2045716492d5ab31cd82f2852d0d93d8edf6a9235653d9da685"
+dependencies = [
+ "zrip-core",
+]
+
 [[package]]
 name = "zstd"
 version = "0.13.3"
diff --git a/components-rs/common.h b/components-rs/common.h
index 516014cb99..51e2d71109 100644
--- a/components-rs/common.h
+++ b/components-rs/common.h
@@ -437,6 +437,7 @@ typedef enum ddog_RemoteConfigProduct {
   DDOG_REMOTE_CONFIG_PRODUCT_FFE_FLAGS,
   DDOG_REMOTE_CONFIG_PRODUCT_LIVE_DEBUGGING,
   DDOG_REMOTE_CONFIG_PRODUCT_LIVE_DEBUGGING_SYMBOL_DB,
+  DDOG_REMOTE_CONFIG_PRODUCT_DEBUG,
 } ddog_RemoteConfigProduct;
 
 typedef enum ddog_SpanProbeTarget {
@@ -1246,6 +1247,8 @@ typedef struct ddog_FfeExposure {
   ddog_CharSlice subject_attributes_json;
   ddog_CharSlice allocation_key;
   ddog_CharSlice variant;
+  int32_t serial_id;
+  bool has_serial_id;
 } ddog_FfeExposure;
 
 typedef struct ddog_Slice_FfeExposure {
diff --git a/components-rs/sidecar.h b/components-rs/sidecar.h
index 72ea5e9e02..f014577164 100644
--- a/components-rs/sidecar.h
+++ b/components-rs/sidecar.h
@@ -307,6 +307,27 @@ ddog_MaybeError ddog_sidecar_send_trace_v04_bytes(struct ddog_SidecarTransport *
                                                   ddog_CharSlice data,
                                                   const struct ddog_TracerHeaderTags *tracer_header_tags);
 
+/**
+ * Sends a V1-encoded trace to the sidecar via shared memory. The sidecar decodes the V1
+ * `TracerPayload`, can inspect it, and re-encodes it as V1 msgpack on the way to the agent's
+ * `/v1.0/traces` endpoint.
+ */
+ddog_MaybeError ddog_sidecar_send_trace_v1_shm(struct ddog_SidecarTransport **transport,
+                                               const struct ddog_InstanceId *instance_id,
+                                               struct ddog_ShmHandle *shm_handle,
+                                               uintptr_t len,
+                                               const struct ddog_TracerHeaderTags *tracer_header_tags);
+
+/**
+ * Sends a V1-encoded trace as bytes to the sidecar. The sidecar decodes the V1 `TracerPayload`,
+ * can inspect it, and re-encodes it as V1 msgpack on the way to the agent's `/v1.0/traces`
+ * endpoint.
+ */
+ddog_MaybeError ddog_sidecar_send_trace_v1_bytes(struct ddog_SidecarTransport **transport,
+                                                 const struct ddog_InstanceId *instance_id,
+                                                 ddog_CharSlice data,
+                                                 const struct ddog_TracerHeaderTags *tracer_header_tags);
+
 ddog_MaybeError ddog_sidecar_send_debugger_data(struct ddog_SidecarTransport **transport,
                                                 const struct ddog_InstanceId *instance_id,
                                                 ddog_QueueId queue_id,
diff --git a/libdatadog b/libdatadog
index 378be45c30..0c0c60b968 160000
--- a/libdatadog
+++ b/libdatadog
@@ -1 +1 @@
-Subproject commit 378be45c30e9c62a1203c4cc2069aaaf8d1f4673
+Subproject commit 0c0c60b968e7f4f2f6e43fffc3f7a1710c1eade5
diff --git a/tracer/ffe.c b/tracer/ffe.c
index 13653a2fab..bf0a1cce62 100644
--- a/tracer/ffe.c
+++ b/tracer/ffe.c
@@ -31,6 +31,8 @@ typedef struct {
     zend_string *subject_attributes_json;
     zend_string *allocation_key;
     zend_string *variant;
+    int32_t serial_id;
+    bool has_serial_id;
 } dd_ffe_exposure;
 
 static void dd_ffe_release_metric(dd_ffe_metric *metric) {
@@ -168,7 +170,9 @@ void ddtrace_ffe_record_exposure(
     zend_string *targeting_key,
     zend_string *subject_attributes_json,
     zend_string *allocation_key,
-    zend_string *variant
+    zend_string *variant,
+    int32_t serial_id,
+    bool has_serial_id
 ) {
     if (ZSTR_LEN(flag_key) == 0 || ZSTR_LEN(variant) == 0) {
         return;
@@ -200,6 +204,8 @@ void ddtrace_ffe_record_exposure(
     exposure->subject_attributes_json = zend_string_copy(subject_attributes_json);
     exposure->allocation_key = zend_string_copy(allocation_key);
     exposure->variant = zend_string_copy(variant);
+    exposure->serial_id = serial_id;
+    exposure->has_serial_id = has_serial_id;
 }
 
 bool ddtrace_ffe_flush_exposures(void) {
@@ -224,6 +230,8 @@ bool ddtrace_ffe_flush_exposures(void) {
             .subject_attributes_json = dd_zend_string_to_CharSlice(buffer[i].subject_attributes_json),
             .allocation_key = dd_zend_string_to_CharSlice(buffer[i].allocation_key),
             .variant = dd_zend_string_to_CharSlice(buffer[i].variant),
+            .serial_id = buffer[i].serial_id,
+            .has_serial_id = buffer[i].has_serial_id,
         };
     }
 
diff --git a/tracer/ffe.h b/tracer/ffe.h
index 0b61ab9a21..4da7f951f2 100644
--- a/tracer/ffe.h
+++ b/tracer/ffe.h
@@ -3,12 +3,13 @@
 
 #include <stdbool.h>
 #include <stddef.h>
+#include <stdint.h>
 #include <zend.h>
 
 bool ddtrace_ffe_record_evaluation_metric(zend_string *flag_key, zend_string *variant, const char *reason, const char *error_type, zend_string *allocation_key);
 bool ddtrace_ffe_flush_evaluation_metrics(void);
 
-void ddtrace_ffe_record_exposure(zend_string *flag_key, zend_string *targeting_key, zend_string *subject_attributes_json, zend_string *allocation_key, zend_string *variant);
+void ddtrace_ffe_record_exposure(zend_string *flag_key, zend_string *targeting_key, zend_string *subject_attributes_json, zend_string *allocation_key, zend_string *variant, int32_t serial_id, bool has_serial_id);
 bool ddtrace_ffe_flush_exposures(void);
 
 #endif // DDTRACE_FFE_H
diff --git a/tracer/functions.c b/tracer/functions.c
index 4fa26d489c..9b1b3bd46e 100644
--- a/tracer/functions.c
+++ b/tracer/functions.c
@@ -1900,7 +1900,9 @@ PHP_FUNCTION(DDTrace_ffe_evaluate) {
             targeting_key,
             subject_attributes_json,
             allocation_key,
-            variant
+            variant,
+            result.serial_id,
+            result.has_serial_id
         );
         zend_string_release(subject_attributes_json);
     }