feat(admin): chart redraws every 1 s — live bucket at right edge

Separate chart refresh from bucket flush:
- 5 s flush commits completed bucket into buf, resets accumulator
- Every poll (1 s): redraw path as buf[1..] + current live bucket
  so the rightmost bar visually builds up in real time
- Label and chart now both update at 1 s cadence

Co-Authored-By: Mira Rehfeld <noreply@anthropic.com>

apix-admin/src/main/resources/META-INF/resources/admin.js

@@ -206,20 +206,28 @@
     if (elLive) elLive.textContent = fmt(rpm) + ' req/min (' + pct + '%)';
   }
 
-  // Chart bucket: flush accumulated delta every 5 s regardless of poll rate
-  // Cap at rateLimit so the area never visually exceeds 100% (live label shows true value)
+  // Compute the current in-progress bucket value (capped at rateLimit)
+  function liveRpm() {
+    var windowMs = Math.max(Date.now() - lastFlushTime, 1);
+    return Math.min(Math.round(accDelta * (60000 / windowMs)), rateLimit);
+  }
+
+  // Redraw: historical buf + current live bucket at the right edge ("now")
+  function redraw() {
+    var view = buf.slice(1).concat([liveRpm()]);
+    path.attr('d', areaFn(view));
+  }
+
+  // Every 5 s: commit the current bucket into buf, reset accumulator
   setInterval(function () {
-    var now = Date.now();
-    var elapsed = now - lastFlushTime;
-    var rpm = Math.min(Math.round(accDelta * (60000 / (elapsed || CHART_TICK))), rateLimit);
+    var rpm = liveRpm();
     lastWindowRpm = rpm;
-    lastFlushTime = now;
+    lastFlushTime = Date.now();
     buf.push(rpm); buf.shift();
-    path.attr('d', areaFn(buf));
     accDelta = 0;
   }, CHART_TICK);
 
-  async function poll(elapsed) {
+  async function poll() {
     try {
       var r = await fetch('/sandbox/' + sid + '/poll');
       if (!r.ok) return;
@@ -229,12 +237,10 @@
         var delta = Math.max(0, total - lastTotal);
         accDelta += delta;
         if (delta > 0) lastActivity = Date.now();
-        // Use accumulated rate over current window — smooth, not instantaneous per-poll delta
         var windowMs = Date.now() - lastFlushTime;
-        var liveRpm = windowMs > 200
-          ? Math.round(accDelta * (60000 / windowMs))
-          : lastWindowRpm; // too early in window — carry previous
-        updateLabel(liveRpm);
+        var rpm = windowMs > 200 ? liveRpm() : lastWindowRpm;
+        updateLabel(rpm);
+        redraw(); // update chart on every poll, not just every 5 s
       }
       lastTotal = total;
       currentInterval = (Date.now() - lastActivity > IDLE_AFTER_MS) ? IDLE_INTERVAL : FAST_INTERVAL;
@@ -243,9 +249,9 @@
 
   function scheduleNext() {
     var interval = currentInterval;
-    setTimeout(function () { poll(interval).then(scheduleNext); }, interval);
+    setTimeout(function () { poll().then(scheduleNext); }, interval);
   }
 
-  poll(0); // set lastTotal immediately, no rpm yet
+  poll(); // set lastTotal immediately
   scheduleNext();
 })();

apix-admin/src/main/resources/templates/DashboardResource/global.html

@@ -106,6 +106,6 @@ nav {
 <script>var __D = {statsJson.raw};</script>
 <script src="https://cdn.jsdelivr.net/npm/d3@7/dist/d3.min.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/topojson-client@3/dist/topojson-client.min.js"></script>
-<script src="/admin.js?v=8"></script>
+<script src="/admin.js?v=9"></script>
 </body>
 </html>

apix-admin/src/main/resources/templates/DashboardResource/sandbox.html

@@ -151,6 +151,6 @@ button.promote:hover { background: #2ea043; }
 <script>var __D = {dataJson.raw};</script>
 <script src="https://cdn.jsdelivr.net/npm/d3@7/dist/d3.min.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/topojson-client@3/dist/topojson-client.min.js"></script>
-<script src="/admin.js?v=8"></script>
+<script src="/admin.js?v=9"></script>
 </body>
 </html>