feat core: add response body length tag

commit_hash:986ec6907438837bba5f609f71c15f3b9a5f9aca

Author: ivan-skryabin

core/src/server/middlewares/handler_adapter.cpp

@@ -30,6 +30,7 @@ namespace {
 constexpr utils::StringLiteral kTracingTypeRequest = "request";
 constexpr utils::StringLiteral kTracingBody = "body";
 constexpr utils::StringLiteral kTracingUri = "uri";
+constexpr utils::StringLiteral kTracingRequestBodyLength = "request_body_length";
 
 constexpr utils::StringLiteral kAcceptLanguageTag = "acceptlang";
 
@@ -149,7 +150,7 @@ void HandlerAdapter::LogRequest(const http::HttpRequest& request, request::Reque
         logging::LogExtra log_extra{
             {tracing::kHttpMetaType, meta_type},
             {tracing::kType, kTracingTypeRequest},
-            {"request_body_length", request.RequestBody().length()},
+            {kTracingRequestBodyLength, request.RequestBody().length()},
             {kTracingBody, handler_.GetRequestBodyForLoggingChecked(request, context, request.RequestBody())},
             {kTracingUri, handler_.GetUrlForLoggingChecked(request, context)},
             {tracing::kHttpMethod, request.GetMethodStr()},

core/src/server/middlewares/tracing.cpp

@@ -28,6 +28,7 @@ namespace {
 constexpr utils::StringLiteral kTracingTypeResponse = "response";
 constexpr utils::StringLiteral kTracingBody = "body";
 constexpr utils::StringLiteral kTracingUri = "uri";
+constexpr utils::StringLiteral kTracingResponseBodyLength = "response_body_length";
 
 std::string GetHeadersLogString(const http::HttpResponse& response) {
     std::string result;
@@ -177,6 +178,7 @@ void Tracing::EnrichLogs(
                 std::string{kTracingBody},
                 handler_.GetResponseDataForLoggingChecked(request, context, response.GetData())
             );
+            span.AddNonInheritableTag(std::string{kTracingResponseBodyLength}, response.GetData().length());
         }
         span.AddNonInheritableTag(std::string{kTracingUri}, handler_.GetUrlForLoggingChecked(request, context));
     } catch (const std::exception& ex) {