fix: calc latency when fetching node infos

src/ClusterManager.cpp

@@ -83,11 +83,14 @@ void ClusterManager::fetchNodeInfo(const IPAddress& ip) {
         Serial.println("[Cluster] Skipping fetch for local node");
         return;
     }
+    unsigned long requestStart = millis();
     HTTPClient http;
     WiFiClient client;
     String url = "http://" + ip.toString() + ClusterProtocol::API_NODE_STATUS;
     http.begin(client, url);
     int httpCode = http.GET();
+    unsigned long requestEnd = millis();
+    unsigned long requestDuration = requestEnd - requestStart;
     if (httpCode == 200) {
         String payload = http.getString();
         JsonDocument doc;
@@ -104,6 +107,7 @@ void ClusterManager::fetchNodeInfo(const IPAddress& ip) {
                     node.resources.cpuFreqMHz = doc["cpuFreqMHz"];
                     node.resources.flashChipSize = doc["flashChipSize"];
                     node.status = NodeInfo::ACTIVE;
+                    node.latency = requestDuration;
                     node.lastSeen = millis();
                     node.apiEndpoints.clear();
                     if (doc["api"].is<JsonArray>()) {
@@ -153,7 +157,6 @@ void ClusterManager::updateAllNodeStatuses() {
     for (auto& pair : memberList) {
         NodeInfo& node = pair.second;
         updateNodeStatus(node, now, ctx.config.node_inactive_threshold_ms, ctx.config.node_dead_threshold_ms);
-        node.latency = now - node.lastSeen;
     }
 }