feat(docker): readable names, CPU in cores and memory in bytes, failures listed with since-times (#5209)

#5209 "Docker views: readable names, CPU/memory in cores and bytes, failures
listed with since-time" (milestone 477 "UI problems first").

- A swarm task reads as its service and slot ("codex_db · 1", or the node
  for a global service), with the raw name in the title: Docker page, host
  panel, busiest widget, container detail.
- CPU reads in cores (Docker's 100% = one core), toned by its share of the
  host's CPUs from the agent's per-core series. Memory reads in bytes, against
  a limit only when one is really set (Docker reports host RAM otherwise).
- Exit 137/143 without an OOM kill is a stop, not a failure: no
  exited_nonzero, no crash-loop death, no "failed (24h)", dim exit code.
- "Failed (24h)" is a list (Docker page #failures, linked from the widget
  and the tile): plain containers by their deaths, swarm services by Swarm's
  failed tasks; a second manager's copy of a task death counts once.
- Failing swarm services lead Needs attention; services sort problems first
  with since-times on the page, the widget and the Swarm page; nodes that
  are down or drained sort first.
- Busiest widget orders by a 5-minute CPU average so the list holds still.
- Host panel: a table, problems first with what is wrong and since when;
  replaced swarm tasks hidden and counted.
- Container detail: node hostname, I/O labelled "since start", Restarts
  hidden for swarm tasks with a note on where task failures are.
- Widget names: "Docker — Services & failures", "Docker — Busiest containers".

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

tests/plugins/docker/test_mcp_tools.py

@@ -34,12 +34,21 @@ def test_container_problems_most_severe_first():
 
 
 def test_exited_nonzero_needs_a_recent_death():
-    crashed = _c(status="exited", exit_code=137)
+    crashed = _c(status="exited", exit_code=1)
     assert t.container_problems(crashed, 1, True) == ["exited_nonzero"]
     # A container that died weeks ago and was left stopped is not news.
     assert t.container_problems(crashed, 0, False) == []
 
 
+def test_a_stop_is_not_an_exit_failure():
+    # 137 (SIGKILL) and 143 (SIGTERM) are how `docker stop` ends a container;
+    # without an OOM kill that is someone stopping it, not it failing (#5209).
+    for code in (137, 143):
+        assert t.container_problems(_c(status="exited", exit_code=code), 1, True) == []
+    oom = _c(status="exited", exit_code=137, oom_killed=True)
+    assert t.container_problems(oom, 1, True) == ["oom_killed"]
+
+
 def test_cut_middle_keeps_both_ends_and_sizes_the_gap():
     assert t.cut_middle("short") == "short"
     line = "A" * 10 + "B" * 100 + "C" * 10