修复数据不显示的错误

server/prometheus-service.js

@@ -402,6 +402,51 @@ function mergeCpuHistories(histories) {
   };
 }
 
+/**
+ * Get aggregated traffic history range for preloading (past 24h, 5-min intervals)
+ */
+async function getTrafficHistoryRange(url) {
+  const now = Math.floor(Date.now() / 1000);
+  const start = now - 86400; // 24h ago
+  const step = 300; // 5 minutes
+
+  const queries = [
+    'sum(node_network_receive_bytes_total{device!~"lo|veth.*|docker.*|br-.*"})',
+    'sum(node_network_transmit_bytes_total{device!~"lo|veth.*|docker.*|br-.*"})',
+    'sum(rate(node_network_receive_bytes_total{device!~"lo|veth.*|docker.*|br-.*"}[5m]))',
+    'sum(rate(node_network_transmit_bytes_total{device!~"lo|veth.*|docker.*|br-.*"}[5m]))'
+  ];
+
+  const results = await Promise.all(queries.map(q =>
+    queryRange(url, q, start, now, step).catch(() => [])
+  ));
+
+  const rxBytesRes = results[0];
+  const txBytesRes = results[1];
+  const rxBWRes = results[2];
+  const txBWRes = results[3];
+
+  // Map results by timestamp
+  const dataMap = new Map();
+
+  const process = (res, field) => {
+    if (res.length > 0 && res[0].values) {
+      for (const [ts, val] of res[0].values) {
+        const entry = dataMap.get(ts) || { ts, rxBytes: 0, txBytes: 0, rxBW: 0, txBW: 0 };
+        entry[field] = parseFloat(val) || 0;
+        dataMap.set(ts, entry);
+      }
+    }
+  };
+
+  process(rxBytesRes, 'rxBytes');
+  process(txBytesRes, 'txBytes');
+  process(rxBWRes, 'rxBW');
+  process(txBWRes, 'txBW');
+
+  return Array.from(dataMap.values());
+}
+
 module.exports = {
   testConnection,
   query,
@@ -410,5 +455,6 @@ module.exports = {
   getNetworkHistory,
   mergeNetworkHistories,
   getCpuHistory,
-  mergeCpuHistories
+  mergeCpuHistories,
+  getTrafficHistoryRange
 };