quic: add quic info to quic sockets (envoyproxy#34213)

Signed-off-by: Renjie Tang <renjietang@google.com>

changelogs/current.yaml

@@ -58,6 +58,9 @@ minor_behavior_changes:
     ``%UPSTREAM_REMOTE_PORT%`` and ``%UPSTREAM_REMOTE_ADDRESS_WITHOUT_PORT%`` access log format specifiers.
     This behavior can be reverted by setting the runtime guard
     ``envoy.reloadable_features.upstream_remote_address_use_connection`` to false.
+- area: quic
+  change: |
+    When a quic connection socket is created, the socket's detected transport protocol will be set to "quic".
 
 bug_fixes:
 # *Changes expected to improve the state of the world and are unlikely to have negative effects*

source/common/quic/envoy_quic_utils.cc

@@ -145,8 +145,9 @@ createConnectionSocket(const Network::Address::InstanceConstSharedPtr& peer_addr
   }
   auto connection_socket = std::make_unique<Network::ConnectionSocketImpl>(
       Network::Socket::Type::Datagram, local_addr, peer_addr, Network::SocketCreationOptions{});
+  connection_socket->setDetectedTransportProtocol("quic");
   if (!connection_socket->isOpen()) {
-    ENVOY_LOG_MISC(error, "Failed to create socket");
+    ENVOY_LOG_MISC(error, "Failed to create quic socket");
     return connection_socket;
   }
   connection_socket->addOptions(Network::SocketOptionFactory::buildIpPacketInfoOptions());