CXXCBC-719: Create top level KV operation spans in the Public API (#855)

Author: DemetrisChr

cmake/build_config.hxx.in

@@ -24,3 +24,4 @@
 #cmakedefine COUCHBASE_CXX_CLIENT_BORINGSSL_SHA "@COUCHBASE_CXX_CLIENT_BORINGSSL_SHA@"
 #cmakedefine COUCHBASE_CXX_CLIENT_STATIC_BORINGSSL
 #cmakedefine COUCHBASE_CXX_CLIENT_COLUMNAR
+#cmakedefine COUCHBASE_CXX_CLIENT_CREATE_OPERATION_SPAN_IN_CORE

core/app_telemetry_meter.cxx

@@ -18,6 +18,7 @@
 #include "logger/logger.hxx"
 #include "meta/version.hxx"
 #include "topology/configuration.hxx"
+#include "utils/binary.hxx"
 #include "utils/json.hxx"
 
 #include <spdlog/fmt/bin_to_hex.h>

core/cluster.cxx

@@ -1238,6 +1238,11 @@ class cluster_impl : public std::enable_shared_from_this<cluster_impl>
     return { {}, session_manager_ };
   }
 
+  auto tracer() const -> const std::shared_ptr<tracing::tracer_wrapper>&
+  {
+    return tracer_;
+  }
+
 private:
   void setup_observability()
   {
@@ -2402,4 +2407,11 @@ cluster::to_string() const -> std::string
                      impl_ ? static_cast<const void*>(impl_.get()) : "(none)",
                      impl_ ? std::to_string(impl_.use_count()) : "(none)");
 }
+
+auto
+cluster::tracer() const -> const std::shared_ptr<tracing::tracer_wrapper>&
+{
+  return impl_->tracer();
+}
+
 } // namespace couchbase::core

core/cluster.hxx

@@ -38,6 +38,11 @@ namespace couchbase::core
 class crud_component;
 class cluster_impl;
 
+namespace tracing
+{
+class tracer_wrapper;
+} // namespace tracing
+
 namespace mcbp
 {
 class queue_request;
@@ -312,6 +317,8 @@ public:
 
   [[nodiscard]] auto to_string() const -> std::string;
 
+  [[nodiscard]] auto tracer() const -> const std::shared_ptr<tracing::tracer_wrapper>&;
+
 private:
   std::shared_ptr<cluster_impl> impl_;
 };