diff --git a/apps/api/src/api/v1/ai_slo.py b/apps/api/src/api/v1/ai_slo.py
index 8ce200c8..5ddf0e1b 100644
--- a/apps/api/src/api/v1/ai_slo.py
+++ b/apps/api/src/api/v1/ai_slo.py
@@ -20,6 +20,7 @@ from __future__ import annotations
 import structlog
 from fastapi import APIRouter, Query
 
+from src.services.adr100_slo_status_service import get_adr100_slo_status_service
 from src.services.ai_slo_calculator import AiSloCalculator
 
 logger = structlog.get_logger(__name__)
@@ -50,9 +51,11 @@ async def get_ai_slo(
         if cached:
             data = cached.to_dict()
             data["cache_hit"] = True
+            data["adr100"] = await get_adr100_slo_status_service().fetch_report()
             return data
 
     report = await calc.run()
     data = report.to_dict()
     data["cache_hit"] = False
+    data["adr100"] = await get_adr100_slo_status_service().fetch_report()
     return data
diff --git a/apps/api/src/services/adr100_slo_status_service.py b/apps/api/src/services/adr100_slo_status_service.py
new file mode 100644
index 00000000..37bd56ee
--- /dev/null
+++ b/apps/api/src/services/adr100_slo_status_service.py
@@ -0,0 +1,278 @@
+"""
+Read-only ADR-100 SLO status snapshot.
+
+GovernanceAgent.check_slo_compliance() can emit governance alerts when an SLO is
+violated. This service is intentionally read-only so dashboards can show the
+same Prometheus-backed state without producing Telegram/DB side effects.
+"""
+
+from __future__ import annotations
+
+import math
+from dataclasses import dataclass
+from datetime import UTC, datetime
+from typing import Any
+
+import httpx
+import structlog
+
+from src.core.config import settings
+
+logger = structlog.get_logger(__name__)
+
+
+@dataclass(frozen=True)
+class Adr100SloDefinition:
+    name: str
+    query: str
+    target: float
+    hard_red_line: float
+    direction: str
+    unit: str
+    window: str
+    denominator_query: str | None = None
+    denominator_window_seconds: int = 0
+    minimum_events: float = 1.0
+
+
+ADR100_SLO_DEFINITIONS: tuple[Adr100SloDefinition, ...] = (
+    Adr100SloDefinition(
+        name="autonomy_rate",
+        query="sli:autonomy_rate:5m",
+        target=0.80,
+        hard_red_line=0.70,
+        direction="above",
+        unit="percent",
+        window="5m",
+        denominator_query="sum(rate(automation_operation_log_total[5m]))",
+        denominator_window_seconds=300,
+    ),
+    Adr100SloDefinition(
+        name="decision_accuracy",
+        query="sli:decision_accuracy:5m",
+        target=0.90,
+        hard_red_line=0.85,
+        direction="above",
+        unit="percent",
+        window="5m",
+        denominator_query='sum(rate(automation_operation_log_total{outcome="auto_executed"}[5m]))',
+        denominator_window_seconds=300,
+    ),
+    Adr100SloDefinition(
+        name="confidence_calibration",
+        query="sli:confidence_calibration:1h",
+        target=0.80,
+        hard_red_line=0.70,
+        direction="above",
+        unit="percent",
+        window="1h",
+        denominator_query="sum(rate(approval_records_high_confidence_total[1h]))",
+        denominator_window_seconds=3600,
+    ),
+    Adr100SloDefinition(
+        name="km_growth_rate",
+        query="max(knowledge_entries_created_24h) or max(sli:km_growth_rate:24h)",
+        target=20.0,
+        hard_red_line=5.0,
+        direction="above",
+        unit="count",
+        window="24h",
+    ),
+)
+
+
+class Adr100SloStatusService:
+    """Fetch ADR-100 SLO status from Prometheus without writing governance events."""
+
+    async def fetch_report(self) -> dict[str, Any]:
+        prom_url = getattr(
+            settings,
+            "PROMETHEUS_URL",
+            "http://prometheus.observability.svc:9090",
+        ).rstrip("/")
+        metrics: list[dict[str, Any]] = []
+
+        async with httpx.AsyncClient(timeout=5.0) as client:
+            for definition in ADR100_SLO_DEFINITIONS:
+                metrics.append(await self._fetch_metric(client, prom_url, definition))
+
+        evaluable = [metric for metric in metrics if metric.get("evaluable")]
+        ok_count = sum(1 for metric in evaluable if metric.get("status") == "ok")
+        overall_compliance = (ok_count / len(evaluable)) if evaluable else None
+        overall_status = _overall_status(metrics, evaluable)
+
+        return {
+            "schema_version": "adr100_slo_status_v1",
+            "source": "prometheus",
+            "evaluated_at": datetime.now(UTC).isoformat(),
+            "overall_status": overall_status,
+            "overall_compliance": overall_compliance,
+            "evaluable_count": len(evaluable),
+            "metric_count": len(metrics),
+            "metrics": metrics,
+        }
+
+    async def _fetch_metric(
+        self,
+        client: httpx.AsyncClient,
+        prom_url: str,
+        definition: Adr100SloDefinition,
+    ) -> dict[str, Any]:
+        denominator_value: float | None = None
+        sample_count: float | None = None
+
+        if definition.denominator_query:
+            denominator_result = await _query_prometheus_value(
+                client,
+                prom_url,
+                definition.denominator_query,
+            )
+            if denominator_result["status"] != "ok":
+                return _metric_payload(
+                    definition,
+                    value=None,
+                    status="no_data",
+                    reason=denominator_result["reason"],
+                    denominator_value=None,
+                    sample_count=None,
+                )
+
+            denominator_value = float(denominator_result["value"])
+            sample_count = denominator_value * definition.denominator_window_seconds
+            if sample_count < definition.minimum_events:
+                return _metric_payload(
+                    definition,
+                    value=None,
+                    status="skipped_low_volume",
+                    reason="denominator_below_minimum_events",
+                    denominator_value=denominator_value,
+                    sample_count=sample_count,
+                )
+
+        value_result = await _query_prometheus_value(client, prom_url, definition.query)
+        if value_result["status"] != "ok":
+            status = (
+                "skipped_low_volume"
+                if value_result["reason"] == "prometheus_nan_or_inf"
+                else "no_data"
+            )
+            return _metric_payload(
+                definition,
+                value=None,
+                status=status,
+                reason=value_result["reason"],
+                denominator_value=denominator_value,
+                sample_count=sample_count,
+            )
+
+        value = float(value_result["value"])
+        status = _classify_status(value, definition)
+        return _metric_payload(
+            definition,
+            value=value,
+            status=status,
+            reason=None,
+            denominator_value=denominator_value,
+            sample_count=sample_count if sample_count is not None else value,
+        )
+
+
+async def _query_prometheus_value(
+    client: httpx.AsyncClient,
+    prom_url: str,
+    query: str,
+) -> dict[str, Any]:
+    try:
+        response = await client.get(
+            f"{prom_url}/api/v1/query",
+            params={"query": query},
+        )
+        data = response.json()
+        if data.get("status") != "success":
+            return {"status": "error", "reason": "prometheus_query_failed"}
+
+        results = data.get("data", {}).get("result", [])
+        if not results:
+            return {
+                "status": "no_data",
+                "reason": "prometheus_empty_result_metric_not_emitted",
+            }
+
+        raw_value = results[0]["value"][1]
+        value = float(raw_value)
+        if not math.isfinite(value):
+            return {
+                "status": "skipped",
+                "reason": "prometheus_nan_or_inf",
+                "raw_value": raw_value,
+            }
+        return {"status": "ok", "value": value}
+    except Exception as exc:
+        logger.warning("adr100_slo_prometheus_query_error", query=query, error=str(exc))
+        return {"status": "error", "reason": "prometheus_query_error"}
+
+
+def _metric_payload(
+    definition: Adr100SloDefinition,
+    *,
+    value: float | None,
+    status: str,
+    reason: str | None,
+    denominator_value: float | None,
+    sample_count: float | None,
+) -> dict[str, Any]:
+    return {
+        "name": definition.name,
+        "query": definition.query,
+        "value": value,
+        "target": definition.target,
+        "hard_red_line": definition.hard_red_line,
+        "direction": definition.direction,
+        "unit": definition.unit,
+        "window": definition.window,
+        "status": status,
+        "evaluable": status in {"ok", "warning", "violated"},
+        "reason": reason,
+        "denominator_query": definition.denominator_query,
+        "denominator_value": denominator_value,
+        "sample_count": sample_count,
+    }
+
+
+def _classify_status(value: float, definition: Adr100SloDefinition) -> str:
+    if definition.direction == "above":
+        if value < definition.hard_red_line:
+            return "violated"
+        if value < definition.target:
+            return "warning"
+        return "ok"
+
+    if value > definition.hard_red_line:
+        return "violated"
+    if value > definition.target:
+        return "warning"
+    return "ok"
+
+
+def _overall_status(metrics: list[dict[str, Any]], evaluable: list[dict[str, Any]]) -> str:
+    if any(metric.get("status") == "violated" for metric in metrics):
+        return "violated"
+    if any(metric.get("status") == "warning" for metric in metrics):
+        return "warning"
+    if evaluable and any(metric.get("status") == "skipped_low_volume" for metric in metrics):
+        return "partial"
+    if evaluable:
+        return "ok"
+    if any(metric.get("status") == "no_data" for metric in metrics):
+        return "no_data"
+    return "skipped_low_volume"
+
+
+_adr100_slo_status_service: Adr100SloStatusService | None = None
+
+
+def get_adr100_slo_status_service() -> Adr100SloStatusService:
+    global _adr100_slo_status_service
+    if _adr100_slo_status_service is None:
+        _adr100_slo_status_service = Adr100SloStatusService()
+    return _adr100_slo_status_service
diff --git a/apps/api/tests/test_adr100_slo_status_service.py b/apps/api/tests/test_adr100_slo_status_service.py
new file mode 100644
index 00000000..3fbd0f3e
--- /dev/null
+++ b/apps/api/tests/test_adr100_slo_status_service.py
@@ -0,0 +1,89 @@
+from __future__ import annotations
+
+from typing import Any
+
+import pytest
+
+from src.services.adr100_slo_status_service import Adr100SloStatusService
+
+
+class _FakePrometheusResponse:
+    def __init__(self, payload: dict[str, Any]) -> None:
+        self._payload = payload
+
+    def json(self) -> dict[str, Any]:
+        return self._payload
+
+
+class _FakePrometheusClient:
+    def __init__(self, values: dict[str, str]) -> None:
+        self.values = values
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, exc_type, exc, tb):
+        return False
+
+    async def get(self, *args, **kwargs):  # noqa: ANN002, ANN003
+        query = str(kwargs.get("params", {}).get("query", ""))
+        value = self.values.get(query)
+        if value is None:
+            return _FakePrometheusResponse({
+                "status": "success",
+                "data": {"result": []},
+            })
+        return _FakePrometheusResponse({
+            "status": "success",
+            "data": {"result": [{"value": [1778756604, value]}]},
+        })
+
+
+@pytest.mark.asyncio
+async def test_fetch_report_marks_ratio_slos_low_volume(monkeypatch):
+    values = {
+        "sum(rate(automation_operation_log_total[5m]))": "0",
+        'sum(rate(automation_operation_log_total{outcome="auto_executed"}[5m]))': "0",
+        "sum(rate(approval_records_high_confidence_total[1h]))": "0",
+        "max(knowledge_entries_created_24h) or max(sli:km_growth_rate:24h)": "24",
+    }
+
+    monkeypatch.setattr(
+        "httpx.AsyncClient",
+        lambda *args, **kwargs: _FakePrometheusClient(values),
+    )
+
+    report = await Adr100SloStatusService().fetch_report()
+
+    by_name = {metric["name"]: metric for metric in report["metrics"]}
+    assert by_name["decision_accuracy"]["status"] == "skipped_low_volume"
+    assert by_name["decision_accuracy"]["evaluable"] is False
+    assert by_name["confidence_calibration"]["status"] == "skipped_low_volume"
+    assert by_name["km_growth_rate"]["status"] == "ok"
+    assert by_name["km_growth_rate"]["value"] == 24
+    assert report["overall_status"] == "partial"
+    assert report["overall_compliance"] == 1.0
+
+
+@pytest.mark.asyncio
+async def test_fetch_report_classifies_hard_red_line_violation(monkeypatch):
+    values = {
+        "sum(rate(automation_operation_log_total[5m]))": "0.02",
+        "sli:autonomy_rate:5m": "0.5",
+        'sum(rate(automation_operation_log_total{outcome="auto_executed"}[5m]))': "0",
+        "sum(rate(approval_records_high_confidence_total[1h]))": "0",
+        "max(knowledge_entries_created_24h) or max(sli:km_growth_rate:24h)": "3",
+    }
+
+    monkeypatch.setattr(
+        "httpx.AsyncClient",
+        lambda *args, **kwargs: _FakePrometheusClient(values),
+    )
+
+    report = await Adr100SloStatusService().fetch_report()
+
+    by_name = {metric["name"]: metric for metric in report["metrics"]}
+    assert by_name["autonomy_rate"]["status"] == "violated"
+    assert by_name["autonomy_rate"]["sample_count"] == 6
+    assert by_name["km_growth_rate"]["status"] == "violated"
+    assert report["overall_status"] == "violated"
diff --git a/apps/web/messages/en.json b/apps/web/messages/en.json
index 94289e64..06e0bdb5 100644
--- a/apps/web/messages/en.json
+++ b/apps/web/messages/en.json
@@ -1354,15 +1354,38 @@
     "comingSoon": "This tab is coming soon",
     "slo": {
       "kpi": {
+        "autonomy_rate": "Autonomy Rate",
         "decision_accuracy": "Decision Accuracy",
+        "confidence_calibration": "Confidence Calibration",
         "km_growth_rate": "KM Growth Rate",
         "mcp_call_diversity": "MCP Call Diversity",
+        "auto_execute_success_rate": "Auto Execute Success",
+        "human_override_rate": "Human Override Rate",
+        "verifier_false_neg_rate": "Verifier False Negative",
         "current": "Current",
         "target": "Target",
         "sparkline": "7-day trend",
         "loading": "Loading...",
         "error": "Failed to load",
-        "noData": "No data"
+        "noData": "No data",
+        "sampleCount": "Samples {count}",
+        "window": "Window {window}",
+        "state": {
+          "ok": "OK",
+          "warning": "Below target",
+          "violated": "Hard red line",
+          "skipped_low_volume": "Low sample wait",
+          "no_data": "No data",
+          "error": "Query failed",
+          "partial": "Partially evaluable"
+        },
+        "reason": {
+          "none": "None",
+          "denominator_below_minimum_events": "Denominator events too low",
+          "prometheus_nan_or_inf": "Prometheus has no valid denominator yet",
+          "prometheus_empty_result_metric_not_emitted": "Prometheus has not returned the metric yet",
+          "unknown": "Reason pending"
+        }
       },
       "chart": {
         "title": "30-day Violation Timeline",
diff --git a/apps/web/messages/zh-TW.json b/apps/web/messages/zh-TW.json
index 8b2a0642..42c0663f 100644
--- a/apps/web/messages/zh-TW.json
+++ b/apps/web/messages/zh-TW.json
@@ -1355,15 +1355,38 @@
     "comingSoon": "本 Tab 即將上線",
     "slo": {
       "kpi": {
+        "autonomy_rate": "自主化率",
         "decision_accuracy": "決策準確率",
+        "confidence_calibration": "信心校準",
         "km_growth_rate": "KM 成長率",
         "mcp_call_diversity": "MCP 呼叫多樣性",
+        "auto_execute_success_rate": "自動執行成功率",
+        "human_override_rate": "人工推翻率",
+        "verifier_false_neg_rate": "驗證漏判率",
         "current": "當前",
         "target": "目標",
         "sparkline": "7 日趨勢",
         "loading": "載入中...",
         "error": "無法載入",
-        "noData": "暫無資料"
+        "noData": "暫無資料",
+        "sampleCount": "樣本 {count}",
+        "window": "視窗 {window}",
+        "state": {
+          "ok": "正常",
+          "warning": "低於目標",
+          "violated": "硬紅線",
+          "skipped_low_volume": "低樣本等待",
+          "no_data": "沒有資料",
+          "error": "查詢失敗",
+          "partial": "部分可評估"
+        },
+        "reason": {
+          "none": "無",
+          "denominator_below_minimum_events": "分母事件不足",
+          "prometheus_nan_or_inf": "Prometheus 暫無有效分母",
+          "prometheus_empty_result_metric_not_emitted": "Prometheus 尚未回傳指標",
+          "unknown": "原因待查"
+        }
       },
       "chart": {
         "title": "30 日違反事件時序",
diff --git a/apps/web/src/app/[locale]/governance/tabs/slo-tab.tsx b/apps/web/src/app/[locale]/governance/tabs/slo-tab.tsx
index 37b6e6c1..ed6cd089 100644
--- a/apps/web/src/app/[locale]/governance/tabs/slo-tab.tsx
+++ b/apps/web/src/app/[locale]/governance/tabs/slo-tab.tsx
@@ -31,11 +31,32 @@ const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? ''
 // =============================================================================
 
 interface SloApiResponse {
-  metrics?: {
+  metrics?: Array<{
+    name: SloMetric['name']
+    value: number | null
+    threshold: number
+    direction: 'above' | 'below'
+    sample_count: number
+    violated: boolean
+  }> | {
     decision_accuracy?: { current: number; target: number; status: string; sparkline?: number[] }
     km_growth_rate?:    { current: number; target: number; status: string; sparkline?: number[] }
     mcp_call_diversity?: { current: number; target: number; status: string; sparkline?: number[] }
   }
+  adr100?: {
+    overall_status?: string
+    overall_compliance?: number | null
+    metrics?: Array<{
+      name: SloMetric['name']
+      value: number | null
+      target: number
+      status: 'ok' | 'warning' | 'violated' | 'skipped_low_volume' | 'no_data' | 'error'
+      unit: 'percent' | 'count'
+      sample_count?: number | null
+      window?: string
+      reason?: string | null
+    }>
+  }
   overall_compliance?: number
   computed_at?: string
 }
@@ -51,15 +72,55 @@ interface SummaryApiResponse {
 // =============================================================================
 
 function mapStatus(s: string): SloMetric['status'] {
-  if (s === 'healthy') return 'healthy'
+  if (s === 'healthy' || s === 'ok') return 'healthy'
   if (s === 'warning') return 'warning'
+  if (s === 'skipped_low_volume') return 'syncing'
+  if (s === 'no_data') return 'idle'
   return 'critical'
 }
 
 function buildMetrics(api: SloApiResponse): SloMetric[] {
+  const adr100Metrics = api.adr100?.metrics
+  if (adr100Metrics?.length) {
+    const order: SloMetric['name'][] = ['autonomy_rate', 'decision_accuracy', 'confidence_calibration', 'km_growth_rate']
+    const byName = new Map(adr100Metrics.map(metric => [metric.name, metric]))
+    const built: SloMetric[] = []
+    order.forEach(name => {
+      const entry = byName.get(name)
+      if (!entry) return
+      built.push({
+        name,
+        current: entry.value ?? null,
+        target: entry.target,
+        status: mapStatus(entry.status),
+        state: entry.status,
+        unit: entry.unit === 'count' ? 'count' : '%',
+        sparkline: [],
+        sampleCount: entry.sample_count ?? null,
+        window: entry.window,
+        reason: entry.reason ?? null,
+      })
+    })
+    return built
+  }
+
+  if (Array.isArray(api.metrics)) {
+    return api.metrics.map(entry => ({
+      name: entry.name,
+      current: entry.value,
+      target: entry.threshold,
+      status: entry.value == null ? 'syncing' : entry.violated ? 'critical' : 'healthy',
+      state: entry.value == null ? 'skipped_low_volume' : entry.violated ? 'violated' : 'ok',
+      unit: '%',
+      sparkline: [],
+      sampleCount: entry.sample_count,
+    }))
+  }
+
   const m = api.metrics ?? {}
-  const names: Array<SloMetric['name']> = ['decision_accuracy', 'km_growth_rate', 'mcp_call_diversity']
-  return names.map(name => {
+  if (Array.isArray(m)) return []
+  const names: Array<'decision_accuracy' | 'km_growth_rate' | 'mcp_call_diversity'> = ['decision_accuracy', 'km_growth_rate', 'mcp_call_diversity']
+  return names.map((name): SloMetric => {
     const entry = m[name]
     return {
       name,
@@ -111,7 +172,7 @@ export function SloTab() {
   }, [])
 
   const metrics = sloData ? buildMetrics(sloData) : []
-  const compliance = sloData?.overall_compliance ?? null
+  const compliance = sloData?.adr100?.overall_compliance ?? sloData?.overall_compliance ?? null
 
   const chartData: ViolationDataPoint[] = summaryData?.data ?? []
   const eventTypes: string[] = summaryData?.event_types ?? []
@@ -169,7 +230,7 @@ export function SloTab() {
       className="slo-kpi-grid"
       >
         {sloLoading
-          ? [0, 1, 2].map(i => <SloKpiCard key={i} metric={{ name: 'decision_accuracy', current: null, target: 0.9, status: 'warning' }} loading />)
+          ? [0, 1, 2, 3].map(i => <SloKpiCard key={i} metric={{ name: 'decision_accuracy', current: null, target: 0.9, status: 'warning' }} loading />)
           : metrics.map(m => <SloKpiCard key={m.name} metric={m} />)
         }
       </div>
diff --git a/apps/web/src/components/governance/slo-kpi-card.tsx b/apps/web/src/components/governance/slo-kpi-card.tsx
index a410394a..a8560436 100644
--- a/apps/web/src/components/governance/slo-kpi-card.tsx
+++ b/apps/web/src/components/governance/slo-kpi-card.tsx
@@ -24,12 +24,24 @@ import { useTranslations } from 'next-intl'
 // =============================================================================
 
 export interface SloMetric {
-  name: 'decision_accuracy' | 'km_growth_rate' | 'mcp_call_diversity'
+  name:
+    | 'autonomy_rate'
+    | 'decision_accuracy'
+    | 'confidence_calibration'
+    | 'km_growth_rate'
+    | 'mcp_call_diversity'
+    | 'auto_execute_success_rate'
+    | 'human_override_rate'
+    | 'verifier_false_neg_rate'
   current: number | null
   target: number
-  status: 'healthy' | 'warning' | 'critical'
-  unit?: string
+  status: 'healthy' | 'warning' | 'critical' | 'idle' | 'syncing'
+  state?: 'ok' | 'warning' | 'violated' | 'skipped_low_volume' | 'no_data' | 'error' | 'partial'
+  unit?: '%' | 'count'
   sparkline?: number[]  // 7 points, most recent last
+  sampleCount?: number | null
+  window?: string
+  reason?: string | null
 }
 
 interface SloKpiCardProps {
@@ -45,6 +57,22 @@ const statusColor: Record<SloMetric['status'], string> = {
   healthy:  '#22C55E',
   warning:  '#F59E0B',
   critical: '#FF3300',
+  idle:     '#87867f',
+  syncing:  '#3B82F6',
+}
+
+function formatCompactNumber(value: number): string {
+  if (value >= 100) return value.toFixed(0)
+  if (value >= 10) return value.toFixed(1)
+  return value.toFixed(2)
+}
+
+function reasonKey(reason?: string | null): string {
+  if (!reason) return 'none'
+  if (reason === 'denominator_below_minimum_events') return 'denominator_below_minimum_events'
+  if (reason === 'prometheus_nan_or_inf') return 'prometheus_nan_or_inf'
+  if (reason === 'prometheus_empty_result_metric_not_emitted') return 'prometheus_empty_result_metric_not_emitted'
+  return 'unknown'
 }
 
 // =============================================================================
@@ -73,21 +101,24 @@ export function SloKpiCard({ metric, loading = false }: SloKpiCardProps) {
   if (loading) return <KpiSkeleton />
 
   const color = statusColor[metric.status]
-  const orbStatus: StatusType = metric.status === 'healthy' ? 'healthy'
-    : metric.status === 'warning' ? 'warning'
-    : 'critical'
+  const orbStatus: StatusType = metric.status
 
   const formattedValue = metric.current == null
     ? '--'
     : metric.unit === '%'
       ? `${(metric.current * 100).toFixed(1)}%`
-      : metric.current.toFixed(2)
+      : metric.current.toFixed(0)
 
   const formattedTarget = metric.unit === '%'
     ? `${(metric.target * 100).toFixed(0)}%`
-    : metric.target.toFixed(2)
+    : metric.target.toFixed(0)
 
   const sparkData = (metric.sparkline ?? Array(7).fill(0)).map((v, i) => ({ i, v }))
+  const stateLabel = metric.state ? t(`state.${metric.state}`) : ''
+  const reasonLabel = metric.reason ? t(`reason.${reasonKey(metric.reason)}`) : null
+  const sampleLabel = metric.sampleCount == null
+    ? null
+    : t('sampleCount', { count: formatCompactNumber(metric.sampleCount) })
 
   return (
     <GlassCard variant="elevated" padding="md" className="min-w-0 flex-1">
@@ -114,35 +145,46 @@ export function SloKpiCard({ metric, loading = false }: SloKpiCardProps) {
         color,
         lineHeight: 1,
         marginBottom: 4,
-        letterSpacing: '-0.5px',
+        letterSpacing: 0,
       }}>
         {formattedValue}
       </div>
 
-      {/* Target + sparkline row */}
-      <div style={{ display: 'flex', alignItems: 'flex-end', justifyContent: 'space-between' }}>
-        <span style={{
-          fontFamily: "'DM Mono', monospace",
-          fontSize: 10,
-          color: '#87867f',
-        }}>
-          {t('target')} {formattedTarget}
-        </span>
+      <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
+        {/* Target + sparkline row */}
+        <div style={{ display: 'flex', alignItems: 'flex-end', justifyContent: 'space-between', gap: 8 }}>
+          <span style={{
+            fontFamily: "'DM Mono', monospace",
+            fontSize: 10,
+            color: '#87867f',
+          }}>
+            {t('target')} {formattedTarget}
+          </span>
 
-        {/* Sparkline 80×24px */}
-        <div style={{ width: 80, height: 24 }} aria-label={t('sparkline')}>
-          <ResponsiveContainer width="100%" height="100%">
-            <LineChart data={sparkData} margin={{ top: 2, right: 0, bottom: 2, left: 0 }}>
-              <Line
-                type="monotone"
-                dataKey="v"
-                stroke={color}
-                strokeWidth={1.5}
-                dot={false}
-                isAnimationActive={false}
-              />
-            </LineChart>
-          </ResponsiveContainer>
+          {/* Sparkline 80×24px */}
+          <div style={{ width: 80, height: 24, flexShrink: 0 }} aria-label={t('sparkline')}>
+            <ResponsiveContainer width="100%" height="100%">
+              <LineChart data={sparkData} margin={{ top: 2, right: 0, bottom: 2, left: 0 }}>
+                <Line
+                  type="monotone"
+                  dataKey="v"
+                  stroke={color}
+                  strokeWidth={1.5}
+                  dot={false}
+                  isAnimationActive={false}
+                />
+              </LineChart>
+            </ResponsiveContainer>
+          </div>
+        </div>
+
+        <div style={{ display: 'flex', flexDirection: 'column', gap: 3, minHeight: 28 }}>
+          <span style={{ fontFamily: "'DM Mono', monospace", fontSize: 10, color }}>
+            {stateLabel}
+          </span>
+          <span style={{ fontFamily: "'DM Mono', monospace", fontSize: 9, color: '#87867f', lineHeight: 1.35 }}>
+            {reasonLabel ?? sampleLabel ?? (metric.window ? t('window', { window: metric.window }) : '')}
+          </span>
         </div>
       </div>
     </GlassCard>