添加valkey support

server/index.js

@@ -4,6 +4,7 @@ const cors = require('cors');
 const path = require('path');
 const db = require('./db');
 const prometheusService = require('./prometheus-service');
+const cache = require('./cache');
 const checkAndFixDatabase = require('./db-integrity-check');
 
 const app = express();
@@ -462,12 +463,20 @@ app.get('/api/metrics/overview', async (req, res) => {
       });
     }
 
-    const allMetrics = await Promise.all(sources.map(source =>
-      prometheusService.getOverviewMetrics(source.url, source.name).catch(err => {
+    const allMetrics = await Promise.all(sources.map(async (source) => {
+      const cacheKey = `source_metrics:${source.url}:${source.name}`;
+      const cached = await cache.get(cacheKey);
+      if (cached) return cached;
+
+      try {
+        const metrics = await prometheusService.getOverviewMetrics(source.url, source.name);
+        await cache.set(cacheKey, metrics, 15); // Cache for 15s
+        return metrics;
+      } catch (err) {
         console.error(`Error fetching metrics from ${source.name}:`, err.message);
         return null;
-      })
-    ));
+      }
+    }));
 
     const validMetrics = allMetrics.filter(m => m !== null);