优化显示

public/js/app.js

@@ -328,7 +328,6 @@
           </td>
           <td>
             <div style="color: var(--text-primary); font-weight: 600; font-family: var(--font-sans);">${escapeHtml(server.job)}</div>
-            <div style="font-size: 0.65rem; color: var(--text-muted); opacity: 0.8;">${escapeHtml(server.instance)}</div>
           </td>
           <td>${escapeHtml(server.source)}</td>
           <td>

server/prometheus-service.js

@@ -180,6 +180,7 @@ async function getOverviewMetrics(url, sourceName) {
 
   const getOrCreate = (metric) => {
     const key = metric.instance;
+
     if (!instances.has(key)) {
       instances.set(key, {
         instance: key,