{# traefik/widget_request_chart.html — requests per second across all routers
   and the share answered 5xx, over the last few hours (#5256). The verdict
   carries the figures, so the widget still says something if the chart
   can't draw; a chart that fails says why in place of the canvas. #}
{% if not labels_json or labels_json == '[]' %}
<div class="w-verdict" style="color:var(--text-muted);">No Traefik requests recorded in the last {{ hours }}h.</div>
{% else %}
<div class="w-verdict {{ 'tone-crit' if peak_err and peak_err >= 1 else ('tone-warn' if peak_err else 'tone-ok') }}">
  Now {{ "%.2f"|format(now_req) }} req/s across all routers, peak {{ "%.2f"|format(peak_req) }}.
  {%- if peak_err %} 5xx peaked at {{ "%.2f"|format(peak_err) }}% of responses.{% else %} No 5xx.{% endif %}
</div>
<div style="position:relative;height:160px;" id="chart-traefik-req-box-{{ widget_id }}">
  <canvas id="chart-traefik-req-{{ widget_id }}" aria-label="Requests per second and 5xx share, last {{ hours }} hours"></canvas>
</div>
<script>
(function() {
  var box = document.getElementById("chart-traefik-req-box-{{ widget_id }}");
  var ctx = document.getElementById("chart-traefik-req-{{ widget_id }}");
  if (!ctx) return;
  function fail(why) {
    box.style.height = "auto";
    box.innerHTML = '<div class="w-note"></div>';
    box.firstChild.textContent = "The chart couldn't be drawn: " + why;
  }
  if (!window.Chart) { fail("the chart library didn't load."); return; }
  try {
    var existing = Chart.getChart(ctx);
    if (existing) existing.destroy();
    var times = {{ labels_json | safe }};
    var hhmm = function (ms) {
      return new Date(ms).toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
    };
    var chart = new Chart(ctx.getContext("2d"), {
      type: "line",
      data: {
        labels: times,
        datasets: [
          {
            label: "Requests/s (all routers)",
            data: {{ req_rate_json | safe }},
            borderColor: stewardColor("--blue"),
            backgroundColor: stewardColor("--blue-dim"),
            fill: true, tension: 0.3, pointRadius: 0, borderWidth: 1.5, yAxisID: "y",
          },
          {
            label: "5xx share %",
            data: {{ error_rate_json | safe }},
            borderColor: stewardColor("--red"),
            fill: false, tension: 0.3, pointRadius: 0, borderWidth: 1.5, yAxisID: "y2",
          },
        ]
      },
      options: {
        responsive: true,
        maintainAspectRatio: false,
        animation: false,
        interaction: { mode: "index", intersect: false },
        plugins: {
          legend: { labels: { boxWidth: 10, font: { size: 10 } } },
          tooltip: { callbacks: { title: function (items) { return items.length ? hhmm(times[items[0].dataIndex]) : ""; } } },
        },
        scales: {
          x: {
            ticks: {
              font: { size: 10 }, maxRotation: 0, autoSkip: true, maxTicksLimit: 6,
              callback: function (value) { return hhmm(times[value]); },
            },
            grid: { display: false },
          },
          y: {
            min: 0,
            ticks: { font: { size: 10 } },
            title: { display: true, text: "req/s", font: { size: 9 } },
          },
          y2: {
            position: "right",
            min: 0,
            suggestedMax: 5,
            grid: { drawOnChartArea: false },
            ticks: { color: stewardColor("--red"), font: { size: 10 } },
            title: { display: true, text: "5xx %", color: stewardColor("--red"), font: { size: 9 } },
          },
        }
      }
    });
    // The chart is built while the dashboard may still be placing this cell,
    // and a chart sized then can stay blank until a window resize (#5214).
    // Measure and draw again once layout has settled.
    setTimeout(function () {
      if (!ctx.isConnected) return;
      chart.resize();
      chart.update("none");
    }, 250);
  } catch (err) {
    fail(err && err.message ? err.message : String(err));
  }
})();
</script>
<div class="w-note" style="text-align:right;">last {{ hours }}h, your local time</div>
{% endif %}