Add ingress object for Grafana metrics (#35525)

Author: Amar3tto

.test-infra/metrics/kubernetes/beam-metrics-ingress.yaml

@@ -0,0 +1,36 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: beam-metrics-ingress
+  annotations:
+    kubernetes.io/ingress.global-static-ip-name: beam-metrics-grafana-ip
+    kubernetes.io/ingress.allow-http: "true"
+  labels:
+    app: beam-metrics
+spec:
+  rules:
+    - host: "metrics.beam.apache.org"
+      http:
+        paths:
+          - path: "/*"
+            pathType: ImplementationSpecific
+            backend:
+              service:
+                name: beamgrafana
+                port:
+                  number: 80