feat(dashboard): Monitors widget carries uptime; Uptime / SLA retired (#5250)

The Monitors widget opens with a verdict ("1 of 5 monitors down."), then one
row per monitor under a single header: latency and uptime over 24h, 7d and
30d, down monitors first with why and since when, the name linking to the
monitor. Counts follow the type filter. Problems always show; the limit
trims only the healthy rest ("+N more up").

Uptime / SLA (uptime_summary) repeated those numbers per host; migration
0033 moves dashboards onto Monitors. Shared widget styles (.w-verdict,
.w-table, .w-sub, .w-more) carry the widget-shape ruling for the widgets
that follow.

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

tests/core/test_dashboard_defaults.py

@@ -35,11 +35,9 @@ def test_the_recommended_layout_fills_rows_without_overlap():
 
 
 def test_the_recommended_layout_skips_what_is_not_enabled():
-    keys = [i["key"] for i in recommended_layout({})]
-    assert keys == ["status_overview", "hosts_overview", "monitors", "uptime_summary"]
-    # uptime no longer fits beside the monitors, so it starts the next row
     items = recommended_layout({})
-    assert (items[3]["x"], items[3]["y"]) == (0, 10)
+    assert [i["key"] for i in items] == ["status_overview", "hosts_overview", "monitors"]
+    assert [(i["x"], i["y"]) for i in items] == [(0, 0), (0, 3), (6, 3)]
 
 
 def test_overview_alerts_put_the_breaching_first():
@@ -96,9 +94,9 @@ async def test_the_hosts_widget_shows_load(app):
 
 
 async def test_a_widget_polls_at_its_own_pace(app):
-    defn = {**WIDGET_REGISTRY["uptime_summary"]}
+    defn = {"poll": True, "poll_seconds": 300, "detail_url": "/x"}
     item = SimpleNamespace(db=SimpleNamespace(id=7, grid_x=0, grid_y=0, grid_w=6, grid_h=5),
-                           title="Uptime", defn=defn, hx_url="/uptime/widget")
+                           title="Slow", defn=defn, hx_url="/slow/widget")
     async with app.test_request_context("/"):
         page = await render_template("dashboard/_grid_item.html", item=item, can_edit=False, poll_interval=30)
     assert "every 300s" in page

tests/core/test_monitors_page.py

@@ -137,3 +137,36 @@ async def test_a_down_monitor_says_since_when_and_why_in_the_list(app):
                                      range_key="24h")
     page = " ".join(page.split())
     assert re.search(r'Down <time [^>]*>12m</time> · connection refused', page), page
+
+
+async def _widget(app, problems, rest, more=0, counts=None):
+    counts = counts or {"up": len(rest), "degraded": 0, "down": len(problems), "pending": 0, "paused": 0}
+    async with app.test_request_context("/monitors/widget"):
+        session["user_id"] = "u1"
+        return await render_template("monitors/widget.html", problems=problems, rest=rest, more=more,
+                                     counts=counts, total=len(problems) + len(rest) + more,
+                                     show_down_only=False, widget_id="1")
+
+
+async def test_the_widget_gives_a_verdict_then_problems_with_uptime_columns(app):
+    """#5250: one home for uptime. A verdict, the down monitor first with why
+    and since when, then each monitor's latency and 24h/7d/30d under one header."""
+    down = {**_row(_mon("api", mid="m2"), "down", _check(False)),
+            "uptime": {"24h": 90.0, "7d": 97.5, "30d": 99.12},
+            "down_since": NOW - timedelta(minutes=12), "down_reason": "HTTP 503"}
+    up = {**_row(_mon("web", mid="m1"), "up", _check(ms=31)), "uptime": {"24h": 100.0, "7d": 99.96}}
+    page = await _widget(app, [down], [up], more=3)
+    assert "1 of 5 monitors down." in page
+    assert page.index(">api<") < page.index(">web<")
+    assert 'href="/monitors/m2"' in page and "went down" in page and "12m ago" in page and "HTTP 503" in page
+    assert page.count("<th>") == 5 and "<th>30d</th>" in page
+    assert "99.96%" in page and "31 ms" in page
+    assert ">—<" in page                                  # web has no 30d yet: a dash, not 0
+    assert "+3 more up" in page
+    assert not hex_colours(page), hex_colours(page)
+
+
+async def test_the_widget_says_when_all_is_well(app):
+    up = {**_row(_mon("web", mid="m1"), "up", _check()), "uptime": {"24h": 100.0}}
+    page = await _widget(app, [], [up])
+    assert "All 1 monitor up." in page and "tone-ok" in page