test

            auto &pclient = g_Cluster->getClient();

            if (pclient) {

                // Fetch cluster health under mutex, then release immediately

                // to avoid blocking session/replication operations during JSON build

                // Use try_lock to avoid blocking the HTTP handler (and other

                // cluster operations) while get_cluster_status() sequentially

                // probes every node — unreachable nodes cause long waits.

                decltype(pclient->get_cluster_status()) health;

                try {

                    std::lock_guard<std::mutex> lock(g_Cluster->getClientMutex());

                    std::unique_lock<std::mutex> lock(g_Cluster->getClientMutex(), std::try_to_lock);

                    if (!lock.owns_lock()) {

                        json_object_object_add(jobj, "status", json_object_new_string("BUSY"));

                        json_object_object_add(jobj, "nodes_total", json_object_new_int(0));

                        json_object_object_add(jobj, "nodes_online", json_object_new_int(0));

                        sendJson(curreq, jobj);

                        json_object_put(jobj);

                        return;

                    }

                    health = pclient->get_cluster_status();

                } catch (...) {

                    json_object_object_add(jobj, "status", json_object_new_string("UNAVAILABLE"));