Adding the new rewrite

app/routes/api_health.py

@@ -0,0 +1,25 @@
+"""Liveness, readiness, and Prometheus metrics endpoints (unauthenticated)."""
+from fastapi import APIRouter
+from fastapi.responses import JSONResponse, Response
+
+from ..health import liveness, readiness
+from ..metrics import render_metrics
+
+router = APIRouter()
+
+
+@router.get("/healthz")
+async def healthz():
+    return liveness()
+
+
+@router.get("/readyz")
+async def readyz():
+    status, payload = readiness()
+    return JSONResponse(payload, status_code=status)
+
+
+@router.get("/metrics")
+async def metrics():
+    body, content_type = render_metrics()
+    return Response(content=body, media_type=content_type)