feat(hosts): a host's page stays short — Docker folds past the busiest, monitors add on their own form, agent actions under Manage (#5276, #5277, #5278)

Docker panel (#5276): problems first, then the 8 busiest running
containers by CPU; the other running and the stopped fold behind one
"+N more running · M stopped" line. Containers that are not swarm tasks
read the way the Docker page reads them: CI jobs as "CI: workflow · job",
buildx builders as "BuildKit builder · name".

Monitors card (#5277): the edit/delete icon buttons and the inline add
form are gone. Each row links to its monitor's page; "Add monitor" opens
the add form filed under this host, starting from its address, with the
host in its breadcrumbs and Cancel back to it.

Agent card (#5278): Full metrics stays in view; Update, Rotate token,
Unregister agent (was "Remove") and Re-provision sit under "Manage agent".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/docker/routes.py

@@ -369,19 +369,38 @@ async def host_panel(host_id: str):
             "usage": docker_svc.usage(c, *capacity.get(host_id, (None, None))),
             "uptime": _uptime(c.started_at) if c.status == "running" else None,
         })
-    rows.sort(key=lambda r: (
-        docker_svc.PROBLEMS.index(r["problems"][0]) if r["problems"] else len(docker_svc.PROBLEMS),
-        r["c"].status != "running", r["label"].lower()))
+    shown, folded = host_panel_rows(rows)
     running = sum(1 for r in rows if r["c"].status == "running")
     return await render_template(
         "docker/host_panel.html",
-        rows=rows, says=docker_svc.PROBLEM_SAYS, severity=docker_svc.PROBLEM_SEVERITY,
+        rows=shown, folded=folded, says=docker_svc.PROBLEM_SAYS, severity=docker_svc.PROBLEM_SEVERITY,
         running=running, stopped=len(rows) - running,
         problems=sum(1 for r in rows if r["problems"]),
-        replaced=len(replaced),
+        replaced=len(replaced), busiest=HOST_PANEL_BUSIEST,
     )
 
 
+# Running containers shown before the rest fold away on a host's page (#5276).
+HOST_PANEL_BUSIEST = 8
+
+
+def host_panel_rows(rows: list) -> tuple[list, list]:
+    """(shown, folded) for a host's Docker panel: every container with a
+    problem, worst first; then the busiest running ones by CPU. The other
+    running containers (busiest first) and the stopped ones (by name) fold
+    away, so a host with dozens of containers keeps a short card."""
+    def cpu(r):
+        return getattr(r["c"], "cpu_pct", None) or 0.0
+    problems = sorted((r for r in rows if r["problems"]), key=lambda r: (
+        docker_svc.PROBLEMS.index(r["problems"][0]), r["label"].lower()))
+    running = sorted((r for r in rows if not r["problems"] and r["c"].status == "running"),
+                     key=lambda r: (-cpu(r), r["label"].lower()))
+    stopped = sorted((r for r in rows if not r["problems"] and r["c"].status != "running"),
+                     key=lambda r: r["label"].lower())
+    return (problems + running[:HOST_PANEL_BUSIEST],
+            running[HOST_PANEL_BUSIEST:] + stopped)
+
+
 # Glyph + colour per lifecycle event, so the timeline reads at a glance.
 _EVENT_STYLE = {
     "start":         ("▲", "var(--green)"),