fix(ansible): surface run failure reason; widget audit cleanup

Run UX: when start_run throws before/around launch (e.g. ENOSPC creating the
temp dir — the box is out of disk), the run was marked "failed" with empty
output. Now the exception is broadcast + written to the run output/results so
the run view shows e.g. "[run error] OSError: [Errno 28] No space left on
device" instead of a blank failure.

Widget audit follow-ups (no broken links were found; these are consistency):
- host_resource_history widget now charts root (/) disk, consistent with the
  host panel (was the opaque "disk worst").
- host_resources widget: tooltip on the health dot explaining it warns on the
  worst mount while the number shows root.
- status_overview widget detail_url /status → /status/ (avoid redirect).
- Normalize ad-hoc widget empty-states to the shared .empty style (wording,
  which distinguishes "configured" vs "data yet", preserved).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

plugins/host_agent/routes.py

@@ -398,16 +398,21 @@ async def widget_history():
         points = (await session.execute(
             select(PluginMetric).where(
                 PluginMetric.source_module == SOURCE_MODULE,
-                PluginMetric.resource_name == host.name,
-                PluginMetric.metric_name.in_(
-                    ("cpu_pct", "mem_used_pct", "disk_used_pct_worst")),
                 PluginMetric.recorded_at >= cutoff,
+                or_(
+                    and_(PluginMetric.resource_name == host.name,
+                         PluginMetric.metric_name.in_(("cpu_pct", "mem_used_pct"))),
+                    and_(PluginMetric.resource_name == host.name + ":/",
+                         PluginMetric.metric_name == "disk_used_pct"),
+                ),
             ).order_by(PluginMetric.recorded_at)
         )).scalars().all()
 
-    series: dict[str, list[dict]] = {"cpu_pct": [], "mem_used_pct": [], "disk_used_pct_worst": []}
+    # Disk = root (/), consistent with the host panel — not the opaque "worst".
+    series: dict[str, list[dict]] = {"cpu_pct": [], "mem_used_pct": [], "disk_root": []}
     for p in points:
-        series[p.metric_name].append({"t": p.recorded_at.isoformat(), "v": p.value})
+        key = "disk_root" if p.resource_name != host.name else p.metric_name
+        series[key].append({"t": p.recorded_at.isoformat(), "v": p.value})
 
     return await render_template("widget_history.html", host=host, series=series, hours=hours)
 

plugins/host_agent/templates/widget_history.html

@@ -9,9 +9,9 @@
       type: "line",
       data: {
         datasets: [
-          { label: "CPU %",       data: series.cpu_pct.map(p => ({x: p.t, y: p.v})) },
-          { label: "Mem %",       data: series.mem_used_pct.map(p => ({x: p.t, y: p.v})) },
-          { label: "Disk % worst", data: series.disk_used_pct_worst.map(p => ({x: p.t, y: p.v})) },
+          { label: "CPU %",  data: series.cpu_pct.map(p => ({x: p.t, y: p.v})) },
+          { label: "Mem %",  data: series.mem_used_pct.map(p => ({x: p.t, y: p.v})) },
+          { label: "Disk / %", data: series.disk_root.map(p => ({x: p.t, y: p.v})) },
         ],
       },
       options: {

plugins/host_agent/templates/widget_table.html

@@ -4,7 +4,8 @@
   {% for r in rows %}
   {% set stale = r.stale %}
   <div style="display:flex;align-items:center;gap:0.6rem;font-size:0.82rem;padding:0.3rem 0;border-bottom:1px solid var(--border);">
-    <span class="dot {% if stale %}dot-dim{% elif (r.cpu_pct or 0) >= 90 or (r.mem_used_pct or 0) >= 90 or (r.disk_worst or 0) >= 90 %}dot-warn{% else %}dot-up{% endif %}"></span>
+    <span class="dot {% if stale %}dot-dim{% elif (r.cpu_pct or 0) >= 90 or (r.mem_used_pct or 0) >= 90 or (r.disk_worst or 0) >= 90 %}dot-warn{% else %}dot-up{% endif %}"
+          title="{% if stale %}stale / no recent data{% else %}warns at CPU/memory ≥90% or any disk mount ≥90% (the 'disk /' figure shows root only){% endif %}"></span>
     <a href="/hosts/{{ r.host.id }}"
        style="flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:500;">
       {{ r.host.name }}