feat(monitoring): add VictoriaMetrics trial stack

templates/udproute.yaml

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+# Exhaustive UDPRoute reference (gateway.networking.k8s.io/v1alpha2).
+# Routes raw UDP datagrams (DNS, STUN/TURN, game servers, QUIC-before-TLS)
+# from a UDP listener to backends. Same minimal shape as TCPRoute: UDP has
+# no sessions or headers to match on, so backendRefs carry the whole rule.
+apiVersion: gateway.networking.k8s.io/v1alpha2
+kind: UDPRoute
+metadata:
+  name: app-stun
+  namespace: example
+  labels:
+    app: app
+spec:
+  parentRefs:
+    # Bind to the UDP listener of the Gateway. Same fields as HTTPRoute
+    # parentRefs: name/kind/group plus sectionName and/or port narrowing.
+    - name: example
+      kind: Gateway
+      group: gateway.networking.k8s.io
+      sectionName: udp
+      port: 3478
+  rules:
+    - backendRefs:
+        - name: app-service
+          # port: backend Service port. Required.
+          port: 3478
+          kind: Service
+          group: ""
+          # weight: share of traffic when several backends are listed.
+          weight: 1