add spans_

Author: mabdinur

test/system-tests/request_handler.cpp

@@ -230,6 +230,7 @@ void RequestHandler::on_extract_headers(const httplib::Request& req,
     VALIDATION_ERROR(res, "on_extract_headers: missing `http_headers` field.");
   }
 
+  datadog::tracing::SpanConfig span_cfg;
   auto span = tracer_.extract_span(
       utils::HeaderReader(*http_headers), span_cfg);
 

test/system-tests/request_handler.h

@@ -35,7 +35,7 @@ class RequestHandler final {
   datadog::tracing::Tracer tracer_;
   std::shared_ptr<ManualScheduler> scheduler_;
   std::shared_ptr<DeveloperNoiseLogger> logger_;
-  std::unordered_map<uint64_t, datadog::tracing::Span> active_spans_;
+  std::unordered_map<uint64_t, datadog::tracing::Span> spans_;
 
 #undef VALIDATION_ERROR
 };