feat(admin): adaptive poll rate — 1 s active, 5 s idle after 15 s no traffic

Admin sandbox drill-down polls at 1 s when traffic is flowing (live label
updates feel instant), drops back to 5 s after 15 s of inactivity.
Chart bucket remains fixed at 5 s so x-axis labels stay correct; deltas
accumulate between buckets independently of poll rate.

Tier-dependent rate reserved for future sandbox-owner dashboard.

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

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

@@ -131,98 +131,83 @@
 
 // ── Sandbox live rate chart (sandbox drill-down only) ──────────────────────
 (function () {
-  const el = document.getElementById('rate-chart');
+  var el = document.getElementById('rate-chart');
   if (!el || !window.__D || !__D.sandboxId) return;
 
-  const INTERVAL = 5000;
-  const BUCKETS  = 72; // 6 min at 5s
-  const rateLimit = __D.ratePerMinute || 1;
-  const sid = __D.sandboxId;
+  // Admin always polls at 1 s when active; idles back to 5 s after 15 s of no traffic
+  // Tier-dependent rate would live in a future sandbox-owner dashboard, not here
+  var FAST_INTERVAL = 1000;
+  var IDLE_INTERVAL = 5000;
+  var IDLE_AFTER_MS = 15000; // 15 s inactivity → idle
+  var CHART_TICK    = 5000;  // chart bucket always 5 s so x-axis labels stay correct
+  var BUCKETS       = 72;    // 6 min at 5 s/bucket
 
-  const buf = new Array(BUCKETS).fill(0);
-  let lastTotal = null;
+  var rateLimit = __D.ratePerMinute || 1;
+  var sid       = __D.sandboxId;
 
-  const ML = 36;  // left margin for Y-axis labels
-  const MB = 18;  // bottom margin for X-axis labels
-  const W  = el.parentElement.clientWidth || 900;
-  const H  = 96;
-  const CH = H - MB; // chart height (plot area)
+  var buf          = new Array(BUCKETS).fill(0);
+  var lastTotal    = null;
+  var accDelta     = 0;          // accumulated since last chart flush
+  var lastActivity = Date.now(); // time of last non-zero delta
+  var currentInterval = FAST_INTERVAL;
+
+  var ML = 36, MB = 18;
+  var W  = el.parentElement.clientWidth || 900;
+  var H  = 96, CH = H - MB;
 
   el.setAttribute('viewBox', '0 0 ' + W + ' ' + H);
   el.style.width = '100%';
 
-  const yS = d3.scaleLinear().domain([0, rateLimit * 1.1]).range([CH, 0]);
-  const xS = d3.scaleLinear().domain([0, BUCKETS - 1]).range([ML, W]);
+  var yS = d3.scaleLinear().domain([0, rateLimit * 1.1]).range([CH, 0]);
+  var xS = d3.scaleLinear().domain([0, BUCKETS - 1]).range([ML, W]);
 
-  const areaFn = d3.area()
+  var areaFn = d3.area()
     .x(function (_, i) { return xS(i); })
     .y0(CH)
     .y1(function (d) { return yS(d); })
     .curve(d3.curveCatmullRom.alpha(0.5));
 
-  const svg = d3.select(el);
+  var svg = d3.select(el);
 
-  // Y-axis: 0 / 50 / 100% grid lines + labels
   [0, 50, 100].forEach(function (pct) {
-    const y = yS(rateLimit * pct / 100);
-    svg.append('line')
-      .attr('x1', ML).attr('x2', W)
-      .attr('y1', y).attr('y2', y)
-      .attr('class', 'axis-line');
-    svg.append('text')
-      .attr('x', ML - 4).attr('y', y + 3)
-      .attr('text-anchor', 'end')
-      .attr('class', 'axis-label')
-      .text(pct + '%');
+    var y = yS(rateLimit * pct / 100);
+    svg.append('line').attr('x1', ML).attr('x2', W).attr('y1', y).attr('y2', y).attr('class', 'axis-line');
+    svg.append('text').attr('x', ML - 4).attr('y', y + 3).attr('text-anchor', 'end').attr('class', 'axis-label').text(pct + '%');
   });
 
-  // X-axis baseline + time labels
-  svg.append('line')
-    .attr('x1', ML).attr('x2', W)
-    .attr('y1', CH).attr('y2', CH)
-    .attr('class', 'axis-line');
+  svg.append('line').attr('x1', ML).attr('x2', W).attr('y1', CH).attr('y2', CH).attr('class', 'axis-line');
 
-  [
-    { bucket: 0,            label: '-6m',  anchor: 'start'  },
-    { bucket: BUCKETS / 2,  label: '-3m',  anchor: 'middle' },
-    { bucket: BUCKETS - 1,  label: 'now',  anchor: 'end'    }
-  ].forEach(function (t) {
-    svg.append('text')
-      .attr('x', xS(t.bucket))
-      .attr('y', H - 4)
-      .attr('text-anchor', t.anchor)
-      .attr('class', 'axis-label')
-      .text(t.label);
-  });
+  [{bucket: 0, label: '-6m', anchor: 'start'}, {bucket: BUCKETS / 2, label: '-3m', anchor: 'middle'}, {bucket: BUCKETS - 1, label: 'now', anchor: 'end'}]
+    .forEach(function (t) {
+      svg.append('text').attr('x', xS(t.bucket)).attr('y', H - 4).attr('text-anchor', t.anchor).attr('class', 'axis-label').text(t.label);
+    });
 
-  // 100% limit line (red dashed)
   var ly = yS(rateLimit);
-  svg.append('line')
-    .attr('x1', ML).attr('x2', W)
-    .attr('y1', ly).attr('y2', ly)
-    .attr('class', 'rate-limit-line');
+  svg.append('line').attr('x1', ML).attr('x2', W).attr('y1', ly).attr('y2', ly).attr('class', 'rate-limit-line');
 
   var path = svg.append('path').attr('class', 'rate-area');
 
   function fmt(n) {
-    return n >= 1e6 ? (n / 1e6).toFixed(1) + 'M'
-         : n >= 1e3 ? (n / 1e3).toFixed(1) + 'k'
-         : String(n);
+    return n >= 1e6 ? (n / 1e6).toFixed(1) + 'M' : n >= 1e3 ? (n / 1e3).toFixed(1) + 'k' : String(n);
   }
 
-  function render(rpm) {
-    buf.push(rpm);
-    buf.shift();
-    path.attr('d', areaFn(buf));
-    var pct = rateLimit > 0 ? (rpm / rateLimit * 100).toFixed(1) : '0.0';
-    var txt = fmt(rpm) + ' req/min (' + pct + '%)';
+  function updateLabel(rpm) {
+    var pct  = (rpm / rateLimit * 100).toFixed(1);
     var elNow  = document.getElementById('rate-now');
     var elLive = document.getElementById('rate-live-val');
     if (elNow)  elNow.textContent  = fmt(rpm);
-    if (elLive) elLive.textContent = txt;
+    if (elLive) elLive.textContent = fmt(rpm) + ' req/min (' + pct + '%)';
   }
 
-  async function poll() {
+  // Chart bucket: flush accumulated delta every 5 s regardless of poll rate
+  setInterval(function () {
+    var rpm = Math.round(accDelta * (60000 / CHART_TICK));
+    buf.push(rpm); buf.shift();
+    path.attr('d', areaFn(buf));
+    accDelta = 0;
+  }, CHART_TICK);
+
+  async function poll(elapsed) {
     try {
       var r = await fetch('/sandbox/' + sid + '/poll');
       if (!r.ok) return;
@@ -230,12 +215,21 @@
       var total = Number(d.totalRequests) || 0;
       if (lastTotal !== null) {
         var delta = Math.max(0, total - lastTotal);
-        render(Math.round(delta * (60000 / INTERVAL)));
+        accDelta += delta;
+        if (delta > 0) lastActivity = Date.now();
+        var rpm = elapsed > 0 ? Math.round(delta * (60000 / elapsed)) : 0;
+        updateLabel(rpm);
       }
       lastTotal = total;
+      currentInterval = (Date.now() - lastActivity > IDLE_AFTER_MS) ? IDLE_INTERVAL : FAST_INTERVAL;
     } catch (_) {}
   }
 
-  poll();
-  setInterval(poll, INTERVAL);
+  function scheduleNext() {
+    var interval = currentInterval;
+    setTimeout(function () { poll(interval).then(scheduleNext); }, interval);
+  }
+
+  poll(0); // set lastTotal immediately, no rpm yet
+  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=5"></script>
+<script src="/admin.js?v=6"></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=5"></script>
+<script src="/admin.js?v=6"></script>
 </body>
 </html>