feat(governance): emit adr100 slo metrics

apps/api/src/main.py

@@ -76,13 +76,13 @@ from src.api.v1 import terminal as terminal_v1  # Phase 19.1: Omni-Terminal SSE
 from src.api.v1 import timeline as timeline_v1
 from src.api.v1 import webhooks as webhooks_v1
 from src.core.config import settings
-from src.core.feature_flags import aiops_flags  # ADR-080: AI 自主化飛輪 feature flags 啟動驗證
 from src.core.http_client import close_all_http_clients, init_all_http_clients
 from src.core.logging import get_logger, setup_logging
 from src.core.redis_client import close_redis_pool, init_redis_pool
-from src.services.flywheel_stats_service import get_flywheel_stats_service
 from src.core.sse import get_publisher
 from src.core.telemetry import setup_telemetry, shutdown_telemetry
+from src.services.adr100_slo_metrics_service import get_adr100_slo_metrics_service
+from src.services.flywheel_stats_service import get_flywheel_stats_service
 
 # CTO-201: Database & Executor
 from src.db.base import close_db, init_db
@@ -554,7 +554,6 @@ async def lifespan(_app: FastAPI) -> AsyncGenerator[None, None]:
     # 2026-04-27 P3.1-T3 by Claude
     try:
         from src.utils.timezone import now_taipei
-        from datetime import datetime as _dt
 
         async def _run_kb_rot_cleaner_loop() -> None:
             from src.jobs.kb_rot_cleaner import get_kb_rot_cleaner
@@ -1016,6 +1015,13 @@ async def prometheus_metrics() -> Response:
         content += flywheel_metrics.to_prometheus_lines()
     except Exception:
         logger.warning("prometheus_metrics_flywheel_error")
+    # 2026-05-14 Codex — T18 ADR-100 SLO emitter
+    # GovernanceAgent 讀 Prometheus recording rules；若 /metrics 不吐底層 DB totals，
+    # sli:* rules 會全空並每小時重複發 governance_slo_data_gap。
+    try:
+        content += await get_adr100_slo_metrics_service().to_prometheus_lines()
+    except Exception as exc:
+        logger.warning("prometheus_metrics_adr100_slo_error", error=str(exc))
     return Response(content=content, media_type=CONTENT_TYPE_LATEST)