diff --git a/quiche/quic/core/http/quic_spdy_session.h b/quiche/quic/core/http/quic_spdy_session.h
index 4369cca..0f4d0cc 100644
--- a/quiche/quic/core/http/quic_spdy_session.h
+++ b/quiche/quic/core/http/quic_spdy_session.h
@@ -115,6 +115,12 @@
 
   // 0-RTT related events.
   virtual void OnSettingsFrameResumed(const SettingsFrame& /*frame*/) = 0;
+
+  // Metadata related events.
+  virtual void OnMetadataFrameStart(QuicByteCount /*header_length*/,
+                                    QuicByteCount /*payload_length*/) {}
+  virtual void OnMetadataFramePayload(absl::string_view /*payload*/) {}
+  virtual void OnMetadataFrameEnd() {}
 };
 
 // Whether HTTP Datagrams are supported on this session and if so which version
diff --git a/quiche/quic/core/http/quic_spdy_stream.cc b/quiche/quic/core/http/quic_spdy_stream.cc
index bc00e87..f3b07ed 100644
--- a/quiche/quic/core/http/quic_spdy_stream.cc
+++ b/quiche/quic/core/http/quic_spdy_stream.cc
@@ -1249,6 +1249,11 @@
 
 bool QuicSpdyStream::OnMetadataFrameStart(QuicByteCount header_length,
                                           QuicByteCount payload_length) {
+  if (spdy_session_->debug_visitor()) {
+    spdy_session_->debug_visitor()->OnMetadataFrameStart(header_length,
+                                                         payload_length);
+  }
+
   if (metadata_visitor_ == nullptr) {
     return OnUnknownFrameStart(
         static_cast<uint64_t>(quic::HttpFrameType::METADATA), header_length,
@@ -1268,6 +1273,10 @@
 }
 
 bool QuicSpdyStream::OnMetadataFramePayload(absl::string_view payload) {
+  if (spdy_session_->debug_visitor()) {
+    spdy_session_->debug_visitor()->OnMetadataFramePayload(payload);
+  }
+
   if (metadata_visitor_ == nullptr) {
     return OnUnknownFramePayload(payload);
   }
@@ -1286,6 +1295,10 @@
 }
 
 bool QuicSpdyStream::OnMetadataFrameEnd() {
+  if (spdy_session_->debug_visitor()) {
+    spdy_session_->debug_visitor()->OnMetadataFrameEnd();
+  }
+
   if (metadata_visitor_ == nullptr) {
     return OnUnknownFrameEnd();
   }