[C++ SDK] Add traceparent to TRequestSettings (#17561)

Author: zarinatlupova

include/ydb-cpp-sdk/client/types/request_settings.h

@@ -8,6 +8,7 @@
 
 #include <vector>
 #include <utility>
+#include <string>
 
 namespace NYdb::inline V3 {
 
@@ -20,6 +21,7 @@ struct TRequestSettings {
     FLUENT_SETTING(std::string, RequestType);
     FLUENT_SETTING(THeader, Header);
     FLUENT_SETTING(TDuration, ClientTimeout);
+    FLUENT_SETTING(std::string, TraceParent);
 
     TRequestSettings() = default;
 
@@ -29,6 +31,7 @@ struct TRequestSettings {
         , RequestType_(other.RequestType_)
         , Header_(other.Header_)
         , ClientTimeout_(other.ClientTimeout_)
+        , TraceParent_(other.TraceParent_)
     {}
 };
 

src/client/impl/ydb_internal/rpc_request_settings/settings.h

@@ -24,6 +24,11 @@ struct TRpcRequestSettings {
         rpcSettings.TraceId = settings.TraceId_;
         rpcSettings.RequestType = settings.RequestType_;
         rpcSettings.Header = settings.Header_;
+
+        if (!settings.TraceParent_.empty()) {
+            rpcSettings.Header.emplace_back("traceparent", settings.TraceParent_);
+        }
+        
         rpcSettings.PreferredEndpoint = preferredEndpoint;
         rpcSettings.EndpointPolicy = endpointPolicy;
         rpcSettings.UseAuth = true;