添加延迟显示支持

server/prometheus-service.js

@@ -800,5 +800,22 @@ module.exports = {
   mergeCpuHistories,
   getServerDetails,
   getServerHistory,
-  resolveToken
+  resolveToken,
+  getLatency: async (blackboxUrl, target) => {
+    if (!blackboxUrl || !target) return null;
+    try {
+      const normalized = blackboxUrl.trim().replace(/\/+$/, '');
+      const params = new URLSearchParams({ query: `probe_duration_seconds{instance="${target}"}` });
+      const res = await fetch(`${normalized}/api/v1/query?${params.toString()}`);
+      if (!res.ok) return null;
+      const data = await res.json();
+      if (data.status === 'success' && data.data.result.length > 0) {
+        return parseFloat(data.data.result[0].value[1]) * 1000;
+      }
+      return null;
+    } catch (err) {
+      console.error(`[Prometheus] Error fetching latency for ${target}:`, err.message);
+      return null;
+    }
+  }
 };